Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 26708 insertions, 0 deletions

diff --git a/third_party/sqlite3/ext/fts5.c b/third_party/sqlite3/ext/fts5.c
new file mode 100644
index 0000000000..1660c182d3
--- /dev/null
+++ b/third_party/sqlite3/ext/fts5.c
@@ -0,0 +1,25958 @@
+
+
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS5) 
+
+#if !defined(NDEBUG) && !defined(SQLITE_DEBUG) 
+# define NDEBUG 1
+#endif
+#if defined(NDEBUG) && defined(SQLITE_DEBUG)
+# undef NDEBUG
+#endif
+
+#line 1 "fts5.h"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Interfaces to extend FTS5. Using the interfaces defined in this file, 
+** FTS5 may be extended with:
+**
+**     * custom tokenizers, and
+**     * custom auxiliary functions.
+*/
+
+
+#ifndef _FTS5_H
+#define _FTS5_H
+
+#include "sqlite3.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*************************************************************************
+** CUSTOM AUXILIARY FUNCTIONS
+**
+** Virtual table implementations may overload SQL functions by implementing
+** the sqlite3_module.xFindFunction() method.
+*/
+
+typedef struct Fts5ExtensionApi Fts5ExtensionApi;
+typedef struct Fts5Context Fts5Context;
+typedef struct Fts5PhraseIter Fts5PhraseIter;
+
+typedef void (*fts5_extension_function)(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+);
+
+struct Fts5PhraseIter {
+  const unsigned char *a;
+  const unsigned char *b;
+};
+
+/*
+** EXTENSION API FUNCTIONS
+**
+** xUserData(pFts):
+**   Return a copy of the context pointer the extension function was 
+**   registered with.
+**
+** xColumnTotalSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the FTS5 table. Or, if iCol is
+**   non-negative but less than the number of columns in the table, return
+**   the total number of tokens in column iCol, considering all rows in 
+**   the FTS5 table.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is 
+**   returned.
+**
+** xColumnCount(pFts):
+**   Return the number of columns in the table.
+**
+** xColumnSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the current row. Or, if iCol is
+**   non-negative but less than the number of columns in the table, set
+**   *pnToken to the number of tokens in column iCol of the current row.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is 
+**   returned.
+**
+**   This function may be quite inefficient if used with an FTS5 table
+**   created with the "columnsize=0" option.
+**
+** xColumnText:
+**   If parameter iCol is less than zero, or greater than or equal to the
+**   number of columns in the table, SQLITE_RANGE is returned. 
+**
+**   Otherwise, this function attempts to retrieve the text of column iCol of
+**   the current document. If successful, (*pz) is set to point to a buffer
+**   containing the text in utf-8 encoding, (*pn) is set to the size in bytes
+**   (not characters) of the buffer and SQLITE_OK is returned. Otherwise,
+**   if an error occurs, an SQLite error code is returned and the final values
+**   of (*pz) and (*pn) are undefined.
+**
+** xPhraseCount:
+**   Returns the number of phrases in the current query expression.
+**
+** xPhraseSize:
+**   If parameter iCol is less than zero, or greater than or equal to the
+**   number of phrases in the current query, as returned by xPhraseCount, 
+**   0 is returned. Otherwise, this function returns the number of tokens in
+**   phrase iPhrase of the query. Phrases are numbered starting from zero.
+**
+** xInstCount:
+**   Set *pnInst to the total number of occurrences of all phrases within
+**   the query within the current row. Return SQLITE_OK if successful, or
+**   an error code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created 
+**   with either "detail=none" or "detail=column" and "content=" option 
+**   (i.e. if it is a contentless table), then this API always returns 0.
+**
+** xInst:
+**   Query for the details of phrase match iIdx within the current row.
+**   Phrase matches are numbered starting from zero, so the iIdx argument
+**   should be greater than or equal to zero and smaller than the value
+**   output by xInstCount(). If iIdx is less than zero or greater than
+**   or equal to the value returned by xInstCount(), SQLITE_RANGE is returned.
+**
+**   Otherwise, output parameter *piPhrase is set to the phrase number, *piCol
+**   to the column in which it occurs and *piOff the token offset of the
+**   first token of the phrase. SQLITE_OK is returned if successful, or an
+**   error code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. 
+**
+** xRowid:
+**   Returns the rowid of the current row.
+**
+** xTokenize:
+**   Tokenize text using the tokenizer belonging to the FTS5 table.
+**
+** xQueryPhrase(pFts5, iPhrase, pUserData, xCallback):
+**   This API function is used to query the FTS table for phrase iPhrase
+**   of the current query. Specifically, a query equivalent to:
+**
+**       ... FROM ftstable WHERE ftstable MATCH $p ORDER BY rowid
+**
+**   with $p set to a phrase equivalent to the phrase iPhrase of the
+**   current query is executed. Any column filter that applies to
+**   phrase iPhrase of the current query is included in $p. For each 
+**   row visited, the callback function passed as the fourth argument 
+**   is invoked. The context and API objects passed to the callback 
+**   function may be used to access the properties of each matched row.
+**   Invoking Api.xUserData() returns a copy of the pointer passed as 
+**   the third argument to pUserData.
+**
+**   If parameter iPhrase is less than zero, or greater than or equal to
+**   the number of phrases in the query, as returned by xPhraseCount(),
+**   this function returns SQLITE_RANGE.
+**
+**   If the callback function returns any value other than SQLITE_OK, the
+**   query is abandoned and the xQueryPhrase function returns immediately.
+**   If the returned value is SQLITE_DONE, xQueryPhrase returns SQLITE_OK.
+**   Otherwise, the error code is propagated upwards.
+**
+**   If the query runs to completion without incident, SQLITE_OK is returned.
+**   Or, if some error occurs before the query completes or is aborted by
+**   the callback, an SQLite error code is returned.
+**
+**
+** xSetAuxdata(pFts5, pAux, xDelete)
+**
+**   Save the pointer passed as the second argument as the extension function's 
+**   "auxiliary data". The pointer may then be retrieved by the current or any
+**   future invocation of the same fts5 extension function made as part of
+**   the same MATCH query using the xGetAuxdata() API.
+**
+**   Each extension function is allocated a single auxiliary data slot for
+**   each FTS query (MATCH expression). If the extension function is invoked 
+**   more than once for a single FTS query, then all invocations share a 
+**   single auxiliary data context.
+**
+**   If there is already an auxiliary data pointer when this function is
+**   invoked, then it is replaced by the new pointer. If an xDelete callback
+**   was specified along with the original pointer, it is invoked at this
+**   point.
+**
+**   The xDelete callback, if one is specified, is also invoked on the
+**   auxiliary data pointer after the FTS5 query has finished.
+**
+**   If an error (e.g. an OOM condition) occurs within this function,
+**   the auxiliary data is set to NULL and an error code returned. If the
+**   xDelete parameter was not NULL, it is invoked on the auxiliary data
+**   pointer before returning.
+**
+**
+** xGetAuxdata(pFts5, bClear)
+**
+**   Returns the current auxiliary data pointer for the fts5 extension 
+**   function. See the xSetAuxdata() method for details.
+**
+**   If the bClear argument is non-zero, then the auxiliary data is cleared
+**   (set to NULL) before this function returns. In this case the xDelete,
+**   if any, is not invoked.
+**
+**
+** xRowCount(pFts5, pnRow)
+**
+**   This function is used to retrieve the total number of rows in the table.
+**   In other words, the same value that would be returned by:
+**
+**        SELECT count(*) FROM ftstable;
+**
+** xPhraseFirst()
+**   This function is used, along with type Fts5PhraseIter and the xPhraseNext
+**   method, to iterate through all instances of a single query phrase within
+**   the current row. This is the same information as is accessible via the
+**   xInstCount/xInst APIs. While the xInstCount/xInst APIs are more convenient
+**   to use, this API may be faster under some circumstances. To iterate 
+**   through instances of phrase iPhrase, use the following code:
+**
+**       Fts5PhraseIter iter;
+**       int iCol, iOff;
+**       for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
+**           iCol>=0;
+**           pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
+**       ){
+**         // An instance of phrase iPhrase at offset iOff of column iCol
+**       }
+**
+**   The Fts5PhraseIter structure is defined above. Applications should not
+**   modify this structure directly - it should only be used as shown above
+**   with the xPhraseFirst() and xPhraseNext() API methods (and by
+**   xPhraseFirstColumn() and xPhraseNextColumn() as illustrated below).
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created 
+**   with either "detail=none" or "detail=column" and "content=" option 
+**   (i.e. if it is a contentless table), then this API always iterates
+**   through an empty set (all calls to xPhraseFirst() set iCol to -1).
+**
+** xPhraseNext()
+**   See xPhraseFirst above.
+**
+** xPhraseFirstColumn()
+**   This function and xPhraseNextColumn() are similar to the xPhraseFirst()
+**   and xPhraseNext() APIs described above. The difference is that instead
+**   of iterating through all instances of a phrase in the current row, these
+**   APIs are used to iterate through the set of columns in the current row
+**   that contain one or more instances of a specified phrase. For example:
+**
+**       Fts5PhraseIter iter;
+**       int iCol;
+**       for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
+**           iCol>=0;
+**           pApi->xPhraseNextColumn(pFts, &iter, &iCol)
+**       ){
+**         // Column iCol contains at least one instance of phrase iPhrase
+**       }
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" option. If the FTS5 table is created with either 
+**   "detail=none" "content=" option (i.e. if it is a contentless table), 
+**   then this API always iterates through an empty set (all calls to 
+**   xPhraseFirstColumn() set iCol to -1).
+**
+**   The information accessed using this API and its companion
+**   xPhraseFirstColumn() may also be obtained using xPhraseFirst/xPhraseNext
+**   (or xInst/xInstCount). The chief advantage of this API is that it is
+**   significantly more efficient than those alternatives when used with
+**   "detail=column" tables.  
+**
+** xPhraseNextColumn()
+**   See xPhraseFirstColumn above.
+**
+** xQueryToken(pFts5, iPhrase, iToken, ppToken, pnToken)
+**   This is used to access token iToken of phrase iPhrase of the current
+**   query. Before returning, output parameter *ppToken is set to point
+**   to a buffer containing the requested token, and *pnToken to the
+**   size of this buffer in bytes.
+**
+**   If iPhrase or iToken are less than zero, or if iPhrase is greater than
+**   or equal to the number of phrases in the query as reported by 
+**   xPhraseCount(), or if iToken is equal to or greater than the number of
+**   tokens in the phrase, SQLITE_RANGE is returned and *ppToken and *pnToken
+     are both zeroed.
+**
+**   The output text is not a copy of the query text that specified the
+**   token. It is the output of the tokenizer module. For tokendata=1
+**   tables, this includes any embedded 0x00 and trailing data.
+**
+** xInstToken(pFts5, iIdx, iToken, ppToken, pnToken)
+**   This is used to access token iToken of phrase hit iIdx within the
+**   current row. If iIdx is less than zero or greater than or equal to the
+**   value returned by xInstCount(), SQLITE_RANGE is returned.  Otherwise,
+**   output variable (*ppToken) is set to point to a buffer containing the
+**   matching document token, and (*pnToken) to the size of that buffer in 
+**   bytes. This API is not available if the specified token matches a 
+**   prefix query term. In that case both output variables are always set 
+**   to 0.
+**
+**   The output text is not a copy of the document text that was tokenized.
+**   It is the output of the tokenizer module. For tokendata=1 tables, this 
+**   includes any embedded 0x00 and trailing data.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option.
+*/
+struct Fts5ExtensionApi {
+  int iVersion;                   /* Currently always set to 3 */
+
+  void *(*xUserData)(Fts5Context*);
+
+  int (*xColumnCount)(Fts5Context*);
+  int (*xRowCount)(Fts5Context*, sqlite3_int64 *pnRow);
+  int (*xColumnTotalSize)(Fts5Context*, int iCol, sqlite3_int64 *pnToken);
+
+  int (*xTokenize)(Fts5Context*, 
+    const char *pText, int nText, /* Text to tokenize */
+    void *pCtx,                   /* Context passed to xToken() */
+    int (*xToken)(void*, int, const char*, int, int, int)       /* Callback */
+  );
+
+  int (*xPhraseCount)(Fts5Context*);
+  int (*xPhraseSize)(Fts5Context*, int iPhrase);
+
+  int (*xInstCount)(Fts5Context*, int *pnInst);
+  int (*xInst)(Fts5Context*, int iIdx, int *piPhrase, int *piCol, int *piOff);
+
+  sqlite3_int64 (*xRowid)(Fts5Context*);
+  int (*xColumnText)(Fts5Context*, int iCol, const char **pz, int *pn);
+  int (*xColumnSize)(Fts5Context*, int iCol, int *pnToken);
+
+  int (*xQueryPhrase)(Fts5Context*, int iPhrase, void *pUserData,
+    int(*)(const Fts5ExtensionApi*,Fts5Context*,void*)
+  );
+  int (*xSetAuxdata)(Fts5Context*, void *pAux, void(*xDelete)(void*));
+  void *(*xGetAuxdata)(Fts5Context*, int bClear);
+
+  int (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
+  void (*xPhraseNext)(Fts5Context*, Fts5PhraseIter*, int *piCol, int *piOff);
+
+  int (*xPhraseFirstColumn)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*);
+  void (*xPhraseNextColumn)(Fts5Context*, Fts5PhraseIter*, int *piCol);
+
+  /* Below this point are iVersion>=3 only */
+  int (*xQueryToken)(Fts5Context*, 
+      int iPhrase, int iToken, 
+      const char **ppToken, int *pnToken
+  );
+  int (*xInstToken)(Fts5Context*, int iIdx, int iToken, const char**, int*);
+};
+
+/* 
+** CUSTOM AUXILIARY FUNCTIONS
+*************************************************************************/
+
+/*************************************************************************
+** CUSTOM TOKENIZERS
+**
+** Applications may also register custom tokenizer types. A tokenizer 
+** is registered by providing fts5 with a populated instance of the 
+** following structure. All structure methods must be defined, setting
+** any member of the fts5_tokenizer struct to NULL leads to undefined
+** behaviour. The structure methods are expected to function as follows:
+**
+** xCreate:
+**   This function is used to allocate and initialize a tokenizer instance.
+**   A tokenizer instance is required to actually tokenize text.
+**
+**   The first argument passed to this function is a copy of the (void*)
+**   pointer provided by the application when the fts5_tokenizer object
+**   was registered with FTS5 (the third argument to xCreateTokenizer()). 
+**   The second and third arguments are an array of nul-terminated strings
+**   containing the tokenizer arguments, if any, specified following the
+**   tokenizer name as part of the CREATE VIRTUAL TABLE statement used
+**   to create the FTS5 table.
+**
+**   The final argument is an output variable. If successful, (*ppOut) 
+**   should be set to point to the new tokenizer handle and SQLITE_OK
+**   returned. If an error occurs, some value other than SQLITE_OK should
+**   be returned. In this case, fts5 assumes that the final value of *ppOut 
+**   is undefined.
+**
+** xDelete:
+**   This function is invoked to delete a tokenizer handle previously
+**   allocated using xCreate(). Fts5 guarantees that this function will
+**   be invoked exactly once for each successful call to xCreate().
+**
+** xTokenize:
+**   This function is expected to tokenize the nText byte string indicated 
+**   by argument pText. pText may or may not be nul-terminated. The first
+**   argument passed to this function is a pointer to an Fts5Tokenizer object
+**   returned by an earlier call to xCreate().
+**
+**   The second argument indicates the reason that FTS5 is requesting
+**   tokenization of the supplied text. This is always one of the following
+**   four values:
+**
+**   <ul><li> <b>FTS5_TOKENIZE_DOCUMENT</b> - A document is being inserted into
+**            or removed from the FTS table. The tokenizer is being invoked to
+**            determine the set of tokens to add to (or delete from) the
+**            FTS index.
+**
+**       <li> <b>FTS5_TOKENIZE_QUERY</b> - A MATCH query is being executed 
+**            against the FTS index. The tokenizer is being called to tokenize 
+**            a bareword or quoted string specified as part of the query.
+**
+**       <li> <b>(FTS5_TOKENIZE_QUERY | FTS5_TOKENIZE_PREFIX)</b> - Same as
+**            FTS5_TOKENIZE_QUERY, except that the bareword or quoted string is
+**            followed by a "*" character, indicating that the last token
+**            returned by the tokenizer will be treated as a token prefix.
+**
+**       <li> <b>FTS5_TOKENIZE_AUX</b> - The tokenizer is being invoked to 
+**            satisfy an fts5_api.xTokenize() request made by an auxiliary
+**            function. Or an fts5_api.xColumnSize() request made by the same
+**            on a columnsize=0 database.  
+**   </ul>
+**
+**   For each token in the input string, the supplied callback xToken() must
+**   be invoked. The first argument to it should be a copy of the pointer
+**   passed as the second argument to xTokenize(). The third and fourth
+**   arguments are a pointer to a buffer containing the token text, and the
+**   size of the token in bytes. The 4th and 5th arguments are the byte offsets
+**   of the first byte of and first byte immediately following the text from
+**   which the token is derived within the input.
+**
+**   The second argument passed to the xToken() callback ("tflags") should
+**   normally be set to 0. The exception is if the tokenizer supports 
+**   synonyms. In this case see the discussion below for details.
+**
+**   FTS5 assumes the xToken() callback is invoked for each token in the 
+**   order that they occur within the input text.
+**
+**   If an xToken() callback returns any value other than SQLITE_OK, then
+**   the tokenization should be abandoned and the xTokenize() method should
+**   immediately return a copy of the xToken() return value. Or, if the
+**   input buffer is exhausted, xTokenize() should return SQLITE_OK. Finally,
+**   if an error occurs with the xTokenize() implementation itself, it
+**   may abandon the tokenization and return any error code other than
+**   SQLITE_OK or SQLITE_DONE.
+**
+** SYNONYM SUPPORT
+**
+**   Custom tokenizers may also support synonyms. Consider a case in which a
+**   user wishes to query for a phrase such as "first place". Using the 
+**   built-in tokenizers, the FTS5 query 'first + place' will match instances
+**   of "first place" within the document set, but not alternative forms
+**   such as "1st place". In some applications, it would be better to match
+**   all instances of "first place" or "1st place" regardless of which form
+**   the user specified in the MATCH query text.
+**
+**   There are several ways to approach this in FTS5:
+**
+**   <ol><li> By mapping all synonyms to a single token. In this case, using
+**            the above example, this means that the tokenizer returns the
+**            same token for inputs "first" and "1st". Say that token is in
+**            fact "first", so that when the user inserts the document "I won
+**            1st place" entries are added to the index for tokens "i", "won",
+**            "first" and "place". If the user then queries for '1st + place',
+**            the tokenizer substitutes "first" for "1st" and the query works
+**            as expected.
+**
+**       <li> By querying the index for all synonyms of each query term
+**            separately. In this case, when tokenizing query text, the
+**            tokenizer may provide multiple synonyms for a single term 
+**            within the document. FTS5 then queries the index for each 
+**            synonym individually. For example, faced with the query:
+**
+**   <codeblock>
+**     ... MATCH 'first place'</codeblock>
+**
+**            the tokenizer offers both "1st" and "first" as synonyms for the
+**            first token in the MATCH query and FTS5 effectively runs a query 
+**            similar to:
+**
+**   <codeblock>
+**     ... MATCH '(first OR 1st) place'</codeblock>
+**
+**            except that, for the purposes of auxiliary functions, the query
+**            still appears to contain just two phrases - "(first OR 1st)" 
+**            being treated as a single phrase.
+**
+**       <li> By adding multiple synonyms for a single term to the FTS index.
+**            Using this method, when tokenizing document text, the tokenizer
+**            provides multiple synonyms for each token. So that when a 
+**            document such as "I won first place" is tokenized, entries are
+**            added to the FTS index for "i", "won", "first", "1st" and
+**            "place".
+**
+**            This way, even if the tokenizer does not provide synonyms
+**            when tokenizing query text (it should not - to do so would be
+**            inefficient), it doesn't matter if the user queries for 
+**            'first + place' or '1st + place', as there are entries in the
+**            FTS index corresponding to both forms of the first token.
+**   </ol>
+**
+**   Whether it is parsing document or query text, any call to xToken that
+**   specifies a <i>tflags</i> argument with the FTS5_TOKEN_COLOCATED bit
+**   is considered to supply a synonym for the previous token. For example,
+**   when parsing the document "I won first place", a tokenizer that supports
+**   synonyms would call xToken() 5 times, as follows:
+**
+**   <codeblock>
+**       xToken(pCtx, 0, "i",                      1,  0,  1);
+**       xToken(pCtx, 0, "won",                    3,  2,  5);
+**       xToken(pCtx, 0, "first",                  5,  6, 11);
+**       xToken(pCtx, FTS5_TOKEN_COLOCATED, "1st", 3,  6, 11);
+**       xToken(pCtx, 0, "place",                  5, 12, 17);
+**</codeblock>
+**
+**   It is an error to specify the FTS5_TOKEN_COLOCATED flag the first time
+**   xToken() is called. Multiple synonyms may be specified for a single token
+**   by making multiple calls to xToken(FTS5_TOKEN_COLOCATED) in sequence. 
+**   There is no limit to the number of synonyms that may be provided for a
+**   single token.
+**
+**   In many cases, method (1) above is the best approach. It does not add 
+**   extra data to the FTS index or require FTS5 to query for multiple terms,
+**   so it is efficient in terms of disk space and query speed. However, it
+**   does not support prefix queries very well. If, as suggested above, the
+**   token "first" is substituted for "1st" by the tokenizer, then the query:
+**
+**   <codeblock>
+**     ... MATCH '1s*'</codeblock>
+**
+**   will not match documents that contain the token "1st" (as the tokenizer
+**   will probably not map "1s" to any prefix of "first").
+**
+**   For full prefix support, method (3) may be preferred. In this case, 
+**   because the index contains entries for both "first" and "1st", prefix
+**   queries such as 'fi*' or '1s*' will match correctly. However, because
+**   extra entries are added to the FTS index, this method uses more space
+**   within the database.
+**
+**   Method (2) offers a midpoint between (1) and (3). Using this method,
+**   a query such as '1s*' will match documents that contain the literal 
+**   token "1st", but not "first" (assuming the tokenizer is not able to
+**   provide synonyms for prefixes). However, a non-prefix query like '1st'
+**   will match against "1st" and "first". This method does not require
+**   extra disk space, as no extra entries are added to the FTS index. 
+**   On the other hand, it may require more CPU cycles to run MATCH queries,
+**   as separate queries of the FTS index are required for each synonym.
+**
+**   When using methods (2) or (3), it is important that the tokenizer only
+**   provide synonyms when tokenizing document text (method (3)) or query
+**   text (method (2)), not both. Doing so will not cause any errors, but is
+**   inefficient.
+*/
+typedef struct Fts5Tokenizer Fts5Tokenizer;
+typedef struct fts5_tokenizer fts5_tokenizer;
+struct fts5_tokenizer {
+  int (*xCreate)(void*, const char **azArg, int nArg, Fts5Tokenizer **ppOut);
+  void (*xDelete)(Fts5Tokenizer*);
+  int (*xTokenize)(Fts5Tokenizer*, 
+      void *pCtx,
+      int flags,            /* Mask of FTS5_TOKENIZE_* flags */
+      const char *pText, int nText, 
+      int (*xToken)(
+        void *pCtx,         /* Copy of 2nd argument to xTokenize() */
+        int tflags,         /* Mask of FTS5_TOKEN_* flags */
+        const char *pToken, /* Pointer to buffer containing token */
+        int nToken,         /* Size of token in bytes */
+        int iStart,         /* Byte offset of token within input text */
+        int iEnd            /* Byte offset of end of token within input text */
+      )
+  );
+};
+
+/* Flags that may be passed as the third argument to xTokenize() */
+#define FTS5_TOKENIZE_QUERY     0x0001
+#define FTS5_TOKENIZE_PREFIX    0x0002
+#define FTS5_TOKENIZE_DOCUMENT  0x0004
+#define FTS5_TOKENIZE_AUX       0x0008
+
+/* Flags that may be passed by the tokenizer implementation back to FTS5
+** as the third argument to the supplied xToken callback. */
+#define FTS5_TOKEN_COLOCATED    0x0001      /* Same position as prev. token */
+
+/*
+** END OF CUSTOM TOKENIZERS
+*************************************************************************/
+
+/*************************************************************************
+** FTS5 EXTENSION REGISTRATION API
+*/
+typedef struct fts5_api fts5_api;
+struct fts5_api {
+  int iVersion;                   /* Currently always set to 2 */
+
+  /* Create a new tokenizer */
+  int (*xCreateTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pUserData,
+    fts5_tokenizer *pTokenizer,
+    void (*xDestroy)(void*)
+  );
+
+  /* Find an existing tokenizer */
+  int (*xFindTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void **ppUserData,
+    fts5_tokenizer *pTokenizer
+  );
+
+  /* Create a new auxiliary function */
+  int (*xCreateFunction)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pUserData,
+    fts5_extension_function xFunction,
+    void (*xDestroy)(void*)
+  );
+};
+
+/*
+** END OF REGISTRATION API
+*************************************************************************/
+
+#ifdef __cplusplus
+}  /* end of the 'extern "C"' block */
+#endif
+
+#endif /* _FTS5_H */
+
+#line 1 "fts5Int.h"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+#ifndef _FTS5INT_H
+#define _FTS5INT_H
+
+/* #include "fts5.h" */
+#include "sqlite3ext.h"
+SQLITE_EXTENSION_INIT1
+
+#include <string.h>
+#include <assert.h>
+
+#ifndef SQLITE_AMALGAMATION
+
+typedef unsigned char  u8;
+typedef unsigned int   u32;
+typedef unsigned short u16;
+typedef short i16;
+typedef sqlite3_int64 i64;
+typedef sqlite3_uint64 u64;
+
+#ifndef ArraySize
+# define ArraySize(x) ((int)(sizeof(x) / sizeof(x[0])))
+#endif
+
+#define testcase(x)
+
+#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_MUTATION_TEST)
+# define SQLITE_OMIT_AUXILIARY_SAFETY_CHECKS 1
+#endif
+#if defined(SQLITE_OMIT_AUXILIARY_SAFETY_CHECKS)
+# define ALWAYS(X)      (1)
+# define NEVER(X)       (0)
+#elif !defined(NDEBUG)
+# define ALWAYS(X)      ((X)?1:(assert(0),0))
+# define NEVER(X)       ((X)?(assert(0),1):0)
+#else
+# define ALWAYS(X)      (X)
+# define NEVER(X)       (X)
+#endif
+
+#define MIN(x,y) (((x) < (y)) ? (x) : (y))
+#define MAX(x,y) (((x) > (y)) ? (x) : (y))
+
+/*
+** Constants for the largest and smallest possible 64-bit signed integers.
+*/
+# define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
+# define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
+
+#endif
+
+/* Truncate very long tokens to this many bytes. Hard limit is 
+** (65536-1-1-4-9)==65521 bytes. The limiting factor is the 16-bit offset
+** field that occurs at the start of each leaf page (see fts5_index.c). */
+#define FTS5_MAX_TOKEN_SIZE 32768
+
+/*
+** Maximum number of prefix indexes on single FTS5 table. This must be
+** less than 32. If it is set to anything large than that, an #error
+** directive in fts5_index.c will cause the build to fail.
+*/
+#define FTS5_MAX_PREFIX_INDEXES 31
+
+/*
+** Maximum segments permitted in a single index 
+*/
+#define FTS5_MAX_SEGMENT 2000
+
+#define FTS5_DEFAULT_NEARDIST 10
+#define FTS5_DEFAULT_RANK     "bm25"
+
+/* Name of rank and rowid columns */
+#define FTS5_RANK_NAME "rank"
+#define FTS5_ROWID_NAME "rowid"
+
+#ifdef SQLITE_DEBUG
+# define FTS5_CORRUPT sqlite3Fts5Corrupt()
+static int sqlite3Fts5Corrupt(void);
+#else
+# define FTS5_CORRUPT SQLITE_CORRUPT_VTAB
+#endif
+
+/*
+** The assert_nc() macro is similar to the assert() macro, except that it
+** is used for assert() conditions that are true only if it can be 
+** guranteed that the database is not corrupt.
+*/
+#ifdef SQLITE_DEBUG
+extern int sqlite3_fts5_may_be_corrupt;
+# define assert_nc(x) assert(sqlite3_fts5_may_be_corrupt || (x))
+#else
+# define assert_nc(x) assert(x)
+#endif
+
+/*
+** A version of memcmp() that does not cause asan errors if one of the pointer
+** parameters is NULL and the number of bytes to compare is zero.
+*/
+#define fts5Memcmp(s1, s2, n) ((n)<=0 ? 0 : memcmp((s1), (s2), (n)))
+
+/* Mark a function parameter as unused, to suppress nuisance compiler
+** warnings. */
+#ifndef UNUSED_PARAM
+# define UNUSED_PARAM(X)  (void)(X)
+#endif
+
+#ifndef UNUSED_PARAM2
+# define UNUSED_PARAM2(X, Y)  (void)(X), (void)(Y)
+#endif
+
+typedef struct Fts5Global Fts5Global;
+typedef struct Fts5Colset Fts5Colset;
+
+/* If a NEAR() clump or phrase may only match a specific set of columns, 
+** then an object of the following type is used to record the set of columns.
+** Each entry in the aiCol[] array is a column that may be matched.
+**
+** This object is used by fts5_expr.c and fts5_index.c.
+*/
+struct Fts5Colset {
+  int nCol;
+  int aiCol[1];
+};
+
+
+
+/**************************************************************************
+** Interface to code in fts5_config.c. fts5_config.c contains contains code
+** to parse the arguments passed to the CREATE VIRTUAL TABLE statement.
+*/
+
+typedef struct Fts5Config Fts5Config;
+
+/*
+** An instance of the following structure encodes all information that can
+** be gleaned from the CREATE VIRTUAL TABLE statement.
+**
+** And all information loaded from the %_config table.
+**
+** nAutomerge:
+**   The minimum number of segments that an auto-merge operation should
+**   attempt to merge together. A value of 1 sets the object to use the 
+**   compile time default. Zero disables auto-merge altogether.
+**
+** bContentlessDelete:
+**   True if the contentless_delete option was present in the CREATE 
+**   VIRTUAL TABLE statement.
+**
+** zContent:
+**
+** zContentRowid:
+**   The value of the content_rowid= option, if one was specified. Or 
+**   the string "rowid" otherwise. This text is not quoted - if it is
+**   used as part of an SQL statement it needs to be quoted appropriately.
+**
+** zContentExprlist:
+**
+** pzErrmsg:
+**   This exists in order to allow the fts5_index.c module to return a 
+**   decent error message if it encounters a file-format version it does
+**   not understand.
+**
+** bColumnsize:
+**   True if the %_docsize table is created.
+**
+** bPrefixIndex:
+**   This is only used for debugging. If set to false, any prefix indexes
+**   are ignored. This value is configured using:
+**
+**       INSERT INTO tbl(tbl, rank) VALUES('prefix-index', $bPrefixIndex);
+**
+*/
+struct Fts5Config {
+  sqlite3 *db;                    /* Database handle */
+  char *zDb;                      /* Database holding FTS index (e.g. "main") */
+  char *zName;                    /* Name of FTS index */
+  int nCol;                       /* Number of columns */
+  char **azCol;                   /* Column names */
+  u8 *abUnindexed;                /* True for unindexed columns */
+  int nPrefix;                    /* Number of prefix indexes */
+  int *aPrefix;                   /* Sizes in bytes of nPrefix prefix indexes */
+  int eContent;                   /* An FTS5_CONTENT value */
+  int bContentlessDelete;         /* "contentless_delete=" option (dflt==0) */
+  char *zContent;                 /* content table */ 
+  char *zContentRowid;            /* "content_rowid=" option value */ 
+  int bColumnsize;                /* "columnsize=" option value (dflt==1) */
+  int bTokendata;                 /* "tokendata=" option value (dflt==0) */
+  int eDetail;                    /* FTS5_DETAIL_XXX value */
+  char *zContentExprlist;
+  Fts5Tokenizer *pTok;
+  fts5_tokenizer *pTokApi;
+  int bLock;                      /* True when table is preparing statement */
+  int ePattern;                   /* FTS_PATTERN_XXX constant */
+
+  /* Values loaded from the %_config table */
+  int iVersion;                   /* fts5 file format 'version' */
+  int iCookie;                    /* Incremented when %_config is modified */
+  int pgsz;                       /* Approximate page size used in %_data */
+  int nAutomerge;                 /* 'automerge' setting */
+  int nCrisisMerge;               /* Maximum allowed segments per level */
+  int nUsermerge;                 /* 'usermerge' setting */
+  int nHashSize;                  /* Bytes of memory for in-memory hash */
+  char *zRank;                    /* Name of rank function */
+  char *zRankArgs;                /* Arguments to rank function */
+  int bSecureDelete;              /* 'secure-delete' */
+  int nDeleteMerge;           /* 'deletemerge' */
+
+  /* If non-NULL, points to sqlite3_vtab.base.zErrmsg. Often NULL. */
+  char **pzErrmsg;
+
+#ifdef SQLITE_DEBUG
+  int bPrefixIndex;               /* True to use prefix-indexes */
+#endif
+};
+
+/* Current expected value of %_config table 'version' field. And
+** the expected version if the 'secure-delete' option has ever been
+** set on the table.  */
+#define FTS5_CURRENT_VERSION               4
+#define FTS5_CURRENT_VERSION_SECUREDELETE  5
+
+#define FTS5_CONTENT_NORMAL   0
+#define FTS5_CONTENT_NONE     1
+#define FTS5_CONTENT_EXTERNAL 2
+
+#define FTS5_DETAIL_FULL      0
+#define FTS5_DETAIL_NONE      1
+#define FTS5_DETAIL_COLUMNS   2
+
+#define FTS5_PATTERN_NONE     0
+#define FTS5_PATTERN_LIKE     65  /* matches SQLITE_INDEX_CONSTRAINT_LIKE */
+#define FTS5_PATTERN_GLOB     66  /* matches SQLITE_INDEX_CONSTRAINT_GLOB */
+
+static int sqlite3Fts5ConfigParse(
+    Fts5Global*, sqlite3*, int, const char **, Fts5Config**, char**
+);
+static void sqlite3Fts5ConfigFree(Fts5Config*);
+
+static int sqlite3Fts5ConfigDeclareVtab(Fts5Config *pConfig);
+
+static int sqlite3Fts5Tokenize(
+  Fts5Config *pConfig,            /* FTS5 Configuration object */
+  int flags,                      /* FTS5_TOKENIZE_* flags */
+  const char *pText, int nText,   /* Text to tokenize */
+  void *pCtx,                     /* Context passed to xToken() */
+  int (*xToken)(void*, int, const char*, int, int, int)    /* Callback */
+);
+
+static void sqlite3Fts5Dequote(char *z);
+
+/* Load the contents of the %_config table */
+static int sqlite3Fts5ConfigLoad(Fts5Config*, int);
+
+/* Set the value of a single config attribute */
+static int sqlite3Fts5ConfigSetValue(Fts5Config*, const char*, sqlite3_value*, int*);
+
+static int sqlite3Fts5ConfigParseRank(const char*, char**, char**);
+
+/*
+** End of interface to code in fts5_config.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_buffer.c.
+*/
+
+/*
+** Buffer object for the incremental building of string data.
+*/
+typedef struct Fts5Buffer Fts5Buffer;
+struct Fts5Buffer {
+  u8 *p;
+  int n;
+  int nSpace;
+};
+
+static int sqlite3Fts5BufferSize(int*, Fts5Buffer*, u32);
+static void sqlite3Fts5BufferAppendVarint(int*, Fts5Buffer*, i64);
+static void sqlite3Fts5BufferAppendBlob(int*, Fts5Buffer*, u32, const u8*);
+static void sqlite3Fts5BufferAppendString(int *, Fts5Buffer*, const char*);
+static void sqlite3Fts5BufferFree(Fts5Buffer*);
+static void sqlite3Fts5BufferZero(Fts5Buffer*);
+static void sqlite3Fts5BufferSet(int*, Fts5Buffer*, int, const u8*);
+static void sqlite3Fts5BufferAppendPrintf(int *, Fts5Buffer*, char *zFmt, ...);
+
+static char *sqlite3Fts5Mprintf(int *pRc, const char *zFmt, ...);
+
+#define fts5BufferZero(x)             sqlite3Fts5BufferZero(x)
+#define fts5BufferAppendVarint(a,b,c) sqlite3Fts5BufferAppendVarint(a,b,(i64)c)
+#define fts5BufferFree(a)             sqlite3Fts5BufferFree(a)
+#define fts5BufferAppendBlob(a,b,c,d) sqlite3Fts5BufferAppendBlob(a,b,c,d)
+#define fts5BufferSet(a,b,c,d)        sqlite3Fts5BufferSet(a,b,c,d)
+
+#define fts5BufferGrow(pRc,pBuf,nn) ( \
+  (u32)((pBuf)->n) + (u32)(nn) <= (u32)((pBuf)->nSpace) ? 0 : \
+    sqlite3Fts5BufferSize((pRc),(pBuf),(nn)+(pBuf)->n) \
+)
+
+/* Write and decode big-endian 32-bit integer values */
+static void sqlite3Fts5Put32(u8*, int);
+static int sqlite3Fts5Get32(const u8*);
+
+#define FTS5_POS2COLUMN(iPos) (int)(iPos >> 32)
+#define FTS5_POS2OFFSET(iPos) (int)(iPos & 0x7FFFFFFF)
+
+typedef struct Fts5PoslistReader Fts5PoslistReader;
+struct Fts5PoslistReader {
+  /* Variables used only by sqlite3Fts5PoslistIterXXX() functions. */
+  const u8 *a;                    /* Position list to iterate through */
+  int n;                          /* Size of buffer at a[] in bytes */
+  int i;                          /* Current offset in a[] */
+
+  u8 bFlag;                       /* For client use (any custom purpose) */
+
+  /* Output variables */
+  u8 bEof;                        /* Set to true at EOF */
+  i64 iPos;                       /* (iCol<<32) + iPos */
+};
+static int sqlite3Fts5PoslistReaderInit(
+  const u8 *a, int n,             /* Poslist buffer to iterate through */
+  Fts5PoslistReader *pIter        /* Iterator object to initialize */
+);
+static int sqlite3Fts5PoslistReaderNext(Fts5PoslistReader*);
+
+typedef struct Fts5PoslistWriter Fts5PoslistWriter;
+struct Fts5PoslistWriter {
+  i64 iPrev;
+};
+static int sqlite3Fts5PoslistWriterAppend(Fts5Buffer*, Fts5PoslistWriter*, i64);
+static void sqlite3Fts5PoslistSafeAppend(Fts5Buffer*, i64*, i64);
+
+static int sqlite3Fts5PoslistNext64(
+  const u8 *a, int n,             /* Buffer containing poslist */
+  int *pi,                        /* IN/OUT: Offset within a[] */
+  i64 *piOff                      /* IN/OUT: Current offset */
+);
+
+/* Malloc utility */
+static void *sqlite3Fts5MallocZero(int *pRc, sqlite3_int64 nByte);
+static char *sqlite3Fts5Strndup(int *pRc, const char *pIn, int nIn);
+
+/* Character set tests (like isspace(), isalpha() etc.) */
+static int sqlite3Fts5IsBareword(char t);
+
+
+/* Bucket of terms object used by the integrity-check in offsets=0 mode. */
+typedef struct Fts5Termset Fts5Termset;
+static int sqlite3Fts5TermsetNew(Fts5Termset**);
+static int sqlite3Fts5TermsetAdd(Fts5Termset*, int, const char*, int, int *pbPresent);
+static void sqlite3Fts5TermsetFree(Fts5Termset*);
+
+/*
+** End of interface to code in fts5_buffer.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_index.c. fts5_index.c contains contains code
+** to access the data stored in the %_data table.
+*/
+
+typedef struct Fts5Index Fts5Index;
+typedef struct Fts5IndexIter Fts5IndexIter;
+
+struct Fts5IndexIter {
+  i64 iRowid;
+  const u8 *pData;
+  int nData;
+  u8 bEof;
+};
+
+#define sqlite3Fts5IterEof(x) ((x)->bEof)
+
+/*
+** Values used as part of the flags argument passed to IndexQuery().
+*/
+#define FTS5INDEX_QUERY_PREFIX      0x0001  /* Prefix query */
+#define FTS5INDEX_QUERY_DESC        0x0002  /* Docs in descending rowid order */
+#define FTS5INDEX_QUERY_TEST_NOIDX  0x0004  /* Do not use prefix index */
+#define FTS5INDEX_QUERY_SCAN        0x0008  /* Scan query (fts5vocab) */
+
+/* The following are used internally by the fts5_index.c module. They are
+** defined here only to make it easier to avoid clashes with the flags
+** above. */
+#define FTS5INDEX_QUERY_SKIPEMPTY   0x0010
+#define FTS5INDEX_QUERY_NOOUTPUT    0x0020
+#define FTS5INDEX_QUERY_SKIPHASH    0x0040
+#define FTS5INDEX_QUERY_NOTOKENDATA 0x0080
+#define FTS5INDEX_QUERY_SCANONETERM 0x0100
+
+/*
+** Create/destroy an Fts5Index object.
+*/
+static int sqlite3Fts5IndexOpen(Fts5Config *pConfig, int bCreate, Fts5Index**, char**);
+static int sqlite3Fts5IndexClose(Fts5Index *p);
+
+/*
+** Return a simple checksum value based on the arguments.
+*/
+static u64 sqlite3Fts5IndexEntryCksum(
+  i64 iRowid, 
+  int iCol, 
+  int iPos, 
+  int iIdx,
+  const char *pTerm,
+  int nTerm
+);
+
+/*
+** Argument p points to a buffer containing utf-8 text that is n bytes in 
+** size. Return the number of bytes in the nChar character prefix of the
+** buffer, or 0 if there are less than nChar characters in total.
+*/
+static int sqlite3Fts5IndexCharlenToBytelen(
+  const char *p, 
+  int nByte, 
+  int nChar
+);
+
+/*
+** Open a new iterator to iterate though all rowids that match the 
+** specified token or token prefix.
+*/
+static int sqlite3Fts5IndexQuery(
+  Fts5Index *p,                   /* FTS index to query */
+  const char *pToken, int nToken, /* Token (or prefix) to query for */
+  int flags,                      /* Mask of FTS5INDEX_QUERY_X flags */
+  Fts5Colset *pColset,            /* Match these columns only */
+  Fts5IndexIter **ppIter          /* OUT: New iterator object */
+);
+
+/*
+** The various operations on open token or token prefix iterators opened
+** using sqlite3Fts5IndexQuery().
+*/
+static int sqlite3Fts5IterNext(Fts5IndexIter*);
+static int sqlite3Fts5IterNextFrom(Fts5IndexIter*, i64 iMatch);
+
+/*
+** Close an iterator opened by sqlite3Fts5IndexQuery().
+*/
+static void sqlite3Fts5IterClose(Fts5IndexIter*);
+
+/*
+** Close the reader blob handle, if it is open.
+*/
+static void sqlite3Fts5IndexCloseReader(Fts5Index*);
+
+/*
+** This interface is used by the fts5vocab module.
+*/
+static const char *sqlite3Fts5IterTerm(Fts5IndexIter*, int*);
+static int sqlite3Fts5IterNextScan(Fts5IndexIter*);
+static void *sqlite3Fts5StructureRef(Fts5Index*);
+static void sqlite3Fts5StructureRelease(void*);
+static int sqlite3Fts5StructureTest(Fts5Index*, void*);
+
+/*
+** Used by xInstToken():
+*/
+static int sqlite3Fts5IterToken(Fts5IndexIter*, i64, int, int, const char**, int*);
+
+/*
+** Insert or remove data to or from the index. Each time a document is 
+** added to or removed from the index, this function is called one or more
+** times.
+**
+** For an insert, it must be called once for each token in the new document.
+** If the operation is a delete, it must be called (at least) once for each
+** unique token in the document with an iCol value less than zero. The iPos
+** argument is ignored for a delete.
+*/
+static int sqlite3Fts5IndexWrite(
+  Fts5Index *p,                   /* Index to write to */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+);
+
+/*
+** Indicate that subsequent calls to sqlite3Fts5IndexWrite() pertain to
+** document iDocid.
+*/
+static int sqlite3Fts5IndexBeginWrite(
+  Fts5Index *p,                   /* Index to write to */
+  int bDelete,                    /* True if current operation is a delete */
+  i64 iDocid                      /* Docid to add or remove data from */
+);
+
+/*
+** Flush any data stored in the in-memory hash tables to the database.
+** Also close any open blob handles.
+*/
+static int sqlite3Fts5IndexSync(Fts5Index *p);
+
+/*
+** Discard any data stored in the in-memory hash tables. Do not write it
+** to the database. Additionally, assume that the contents of the %_data
+** table may have changed on disk. So any in-memory caches of %_data 
+** records must be invalidated.
+*/
+static int sqlite3Fts5IndexRollback(Fts5Index *p);
+
+/*
+** Get or set the "averages" values.
+*/
+static int sqlite3Fts5IndexGetAverages(Fts5Index *p, i64 *pnRow, i64 *anSize);
+static int sqlite3Fts5IndexSetAverages(Fts5Index *p, const u8*, int);
+
+/*
+** Functions called by the storage module as part of integrity-check.
+*/
+static int sqlite3Fts5IndexIntegrityCheck(Fts5Index*, u64 cksum, int bUseCksum);
+
+/* 
+** Called during virtual module initialization to register UDF 
+** fts5_decode() with SQLite 
+*/
+static int sqlite3Fts5IndexInit(sqlite3*);
+
+static int sqlite3Fts5IndexSetCookie(Fts5Index*, int);
+
+/*
+** Return the total number of entries read from the %_data table by 
+** this connection since it was created.
+*/
+static int sqlite3Fts5IndexReads(Fts5Index *p);
+
+static int sqlite3Fts5IndexReinit(Fts5Index *p);
+static int sqlite3Fts5IndexOptimize(Fts5Index *p);
+static int sqlite3Fts5IndexMerge(Fts5Index *p, int nMerge);
+static int sqlite3Fts5IndexReset(Fts5Index *p);
+
+static int sqlite3Fts5IndexLoadConfig(Fts5Index *p);
+
+static int sqlite3Fts5IndexGetOrigin(Fts5Index *p, i64 *piOrigin);
+static int sqlite3Fts5IndexContentlessDelete(Fts5Index *p, i64 iOrigin, i64 iRowid);
+
+static void sqlite3Fts5IndexIterClearTokendata(Fts5IndexIter*);
+
+/* Used to populate hash tables for xInstToken in detail=none/column mode. */
+static int sqlite3Fts5IndexIterWriteTokendata(
+    Fts5IndexIter*, const char*, int, i64 iRowid, int iCol, int iOff
+);
+
+/*
+** End of interface to code in fts5_index.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_varint.c. 
+*/
+static int sqlite3Fts5GetVarint32(const unsigned char *p, u32 *v);
+static int sqlite3Fts5GetVarintLen(u32 iVal);
+static u8 sqlite3Fts5GetVarint(const unsigned char*, u64*);
+static int sqlite3Fts5PutVarint(unsigned char *p, u64 v);
+
+#define fts5GetVarint32(a,b) sqlite3Fts5GetVarint32(a,(u32*)&(b))
+#define fts5GetVarint    sqlite3Fts5GetVarint
+
+#define fts5FastGetVarint32(a, iOff, nVal) {      \
+  nVal = (a)[iOff++];                             \
+  if( nVal & 0x80 ){                              \
+    iOff--;                                       \
+    iOff += fts5GetVarint32(&(a)[iOff], nVal);    \
+  }                                               \
+}
+
+
+/*
+** End of interface to code in fts5_varint.c.
+**************************************************************************/
+
+
+/**************************************************************************
+** Interface to code in fts5_main.c. 
+*/
+
+/*
+** Virtual-table object.
+*/
+typedef struct Fts5Table Fts5Table;
+struct Fts5Table {
+  sqlite3_vtab base;              /* Base class used by SQLite core */
+  Fts5Config *pConfig;            /* Virtual table configuration */
+  Fts5Index *pIndex;              /* Full-text index */
+};
+
+static int sqlite3Fts5GetTokenizer(
+  Fts5Global*, 
+  const char **azArg,
+  int nArg,
+  Fts5Config*,
+  char **pzErr
+);
+
+static Fts5Table *sqlite3Fts5TableFromCsrid(Fts5Global*, i64);
+
+static int sqlite3Fts5FlushToDisk(Fts5Table*);
+
+/*
+** End of interface to code in fts5.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_hash.c. 
+*/
+typedef struct Fts5Hash Fts5Hash;
+
+/*
+** Create a hash table, free a hash table.
+*/
+static int sqlite3Fts5HashNew(Fts5Config*, Fts5Hash**, int *pnSize);
+static void sqlite3Fts5HashFree(Fts5Hash*);
+
+static int sqlite3Fts5HashWrite(
+  Fts5Hash*,
+  i64 iRowid,                     /* Rowid for this entry */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  char bByte,
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+);
+
+/*
+** Empty (but do not delete) a hash table.
+*/
+static void sqlite3Fts5HashClear(Fts5Hash*);
+
+/*
+** Return true if the hash is empty, false otherwise.
+*/
+static int sqlite3Fts5HashIsEmpty(Fts5Hash*);
+
+static int sqlite3Fts5HashQuery(
+  Fts5Hash*,                      /* Hash table to query */
+  int nPre,
+  const char *pTerm, int nTerm,   /* Query term */
+  void **ppObj,                   /* OUT: Pointer to doclist for pTerm */
+  int *pnDoclist                  /* OUT: Size of doclist in bytes */
+);
+
+static int sqlite3Fts5HashScanInit(
+  Fts5Hash*,                      /* Hash table to query */
+  const char *pTerm, int nTerm    /* Query prefix */
+);
+static void sqlite3Fts5HashScanNext(Fts5Hash*);
+static int sqlite3Fts5HashScanEof(Fts5Hash*);
+static void sqlite3Fts5HashScanEntry(Fts5Hash *,
+  const char **pzTerm,            /* OUT: term (nul-terminated) */
+  int *pnTerm,                    /* OUT: Size of term in bytes */
+  const u8 **ppDoclist,           /* OUT: pointer to doclist */
+  int *pnDoclist                  /* OUT: size of doclist in bytes */
+);
+
+
+
+/*
+** End of interface to code in fts5_hash.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_storage.c. fts5_storage.c contains contains 
+** code to access the data stored in the %_content and %_docsize tables.
+*/
+
+#define FTS5_STMT_SCAN_ASC  0     /* SELECT rowid, * FROM ... ORDER BY 1 ASC */
+#define FTS5_STMT_SCAN_DESC 1     /* SELECT rowid, * FROM ... ORDER BY 1 DESC */
+#define FTS5_STMT_LOOKUP    2     /* SELECT rowid, * FROM ... WHERE rowid=? */
+
+typedef struct Fts5Storage Fts5Storage;
+
+static int sqlite3Fts5StorageOpen(Fts5Config*, Fts5Index*, int, Fts5Storage**, char**);
+static int sqlite3Fts5StorageClose(Fts5Storage *p);
+static int sqlite3Fts5StorageRename(Fts5Storage*, const char *zName);
+
+static int sqlite3Fts5DropAll(Fts5Config*);
+static int sqlite3Fts5CreateTable(Fts5Config*, const char*, const char*, int, char **);
+
+static int sqlite3Fts5StorageDelete(Fts5Storage *p, i64, sqlite3_value**);
+static int sqlite3Fts5StorageContentInsert(Fts5Storage *p, sqlite3_value**, i64*);
+static int sqlite3Fts5StorageIndexInsert(Fts5Storage *p, sqlite3_value**, i64);
+
+static int sqlite3Fts5StorageIntegrity(Fts5Storage *p, int iArg);
+
+static int sqlite3Fts5StorageStmt(Fts5Storage *p, int eStmt, sqlite3_stmt**, char**);
+static void sqlite3Fts5StorageStmtRelease(Fts5Storage *p, int eStmt, sqlite3_stmt*);
+
+static int sqlite3Fts5StorageDocsize(Fts5Storage *p, i64 iRowid, int *aCol);
+static int sqlite3Fts5StorageSize(Fts5Storage *p, int iCol, i64 *pnAvg);
+static int sqlite3Fts5StorageRowCount(Fts5Storage *p, i64 *pnRow);
+
+static int sqlite3Fts5StorageSync(Fts5Storage *p);
+static int sqlite3Fts5StorageRollback(Fts5Storage *p);
+
+static int sqlite3Fts5StorageConfigValue(
+    Fts5Storage *p, const char*, sqlite3_value*, int
+);
+
+static int sqlite3Fts5StorageDeleteAll(Fts5Storage *p);
+static int sqlite3Fts5StorageRebuild(Fts5Storage *p);
+static int sqlite3Fts5StorageOptimize(Fts5Storage *p);
+static int sqlite3Fts5StorageMerge(Fts5Storage *p, int nMerge);
+static int sqlite3Fts5StorageReset(Fts5Storage *p);
+
+/*
+** End of interface to code in fts5_storage.c.
+**************************************************************************/
+
+
+/**************************************************************************
+** Interface to code in fts5_expr.c. 
+*/
+typedef struct Fts5Expr Fts5Expr;
+typedef struct Fts5ExprNode Fts5ExprNode;
+typedef struct Fts5Parse Fts5Parse;
+typedef struct Fts5Token Fts5Token;
+typedef struct Fts5ExprPhrase Fts5ExprPhrase;
+typedef struct Fts5ExprNearset Fts5ExprNearset;
+
+struct Fts5Token {
+  const char *p;                  /* Token text (not NULL terminated) */
+  int n;                          /* Size of buffer p in bytes */
+};
+
+/* Parse a MATCH expression. */
+static int sqlite3Fts5ExprNew(
+  Fts5Config *pConfig, 
+  int bPhraseToAnd,
+  int iCol,                       /* Column on LHS of MATCH operator */
+  const char *zExpr,
+  Fts5Expr **ppNew, 
+  char **pzErr
+);
+static int sqlite3Fts5ExprPattern(
+  Fts5Config *pConfig, 
+  int bGlob, 
+  int iCol, 
+  const char *zText, 
+  Fts5Expr **pp
+);
+
+/*
+** for(rc = sqlite3Fts5ExprFirst(pExpr, pIdx, bDesc);
+**     rc==SQLITE_OK && 0==sqlite3Fts5ExprEof(pExpr);
+**     rc = sqlite3Fts5ExprNext(pExpr)
+** ){
+**   // The document with rowid iRowid matches the expression!
+**   i64 iRowid = sqlite3Fts5ExprRowid(pExpr);
+** }
+*/
+static int sqlite3Fts5ExprFirst(Fts5Expr*, Fts5Index *pIdx, i64 iMin, int bDesc);
+static int sqlite3Fts5ExprNext(Fts5Expr*, i64 iMax);
+static int sqlite3Fts5ExprEof(Fts5Expr*);
+static i64 sqlite3Fts5ExprRowid(Fts5Expr*);
+
+static void sqlite3Fts5ExprFree(Fts5Expr*);
+static int sqlite3Fts5ExprAnd(Fts5Expr **pp1, Fts5Expr *p2);
+
+/* Called during startup to register a UDF with SQLite */
+static int sqlite3Fts5ExprInit(Fts5Global*, sqlite3*);
+
+static int sqlite3Fts5ExprPhraseCount(Fts5Expr*);
+static int sqlite3Fts5ExprPhraseSize(Fts5Expr*, int iPhrase);
+static int sqlite3Fts5ExprPoslist(Fts5Expr*, int, const u8 **);
+
+typedef struct Fts5PoslistPopulator Fts5PoslistPopulator;
+static Fts5PoslistPopulator *sqlite3Fts5ExprClearPoslists(Fts5Expr*, int);
+static int sqlite3Fts5ExprPopulatePoslists(
+    Fts5Config*, Fts5Expr*, Fts5PoslistPopulator*, int, const char*, int
+);
+static void sqlite3Fts5ExprCheckPoslists(Fts5Expr*, i64);
+
+static int sqlite3Fts5ExprClonePhrase(Fts5Expr*, int, Fts5Expr**);
+
+static int sqlite3Fts5ExprPhraseCollist(Fts5Expr *, int, const u8 **, int *);
+
+static int sqlite3Fts5ExprQueryToken(Fts5Expr*, int, int, const char**, int*);
+static int sqlite3Fts5ExprInstToken(Fts5Expr*, i64, int, int, int, int, const char**, int*);
+static void sqlite3Fts5ExprClearTokens(Fts5Expr*);
+
+/*******************************************
+** The fts5_expr.c API above this point is used by the other hand-written
+** C code in this module. The interfaces below this point are called by
+** the parser code in fts5parse.y.  */
+
+static void sqlite3Fts5ParseError(Fts5Parse *pParse, const char *zFmt, ...);
+
+static Fts5ExprNode *sqlite3Fts5ParseNode(
+  Fts5Parse *pParse,
+  int eType,
+  Fts5ExprNode *pLeft,
+  Fts5ExprNode *pRight,
+  Fts5ExprNearset *pNear
+);
+
+static Fts5ExprNode *sqlite3Fts5ParseImplicitAnd(
+  Fts5Parse *pParse,
+  Fts5ExprNode *pLeft,
+  Fts5ExprNode *pRight
+);
+
+static Fts5ExprPhrase *sqlite3Fts5ParseTerm(
+  Fts5Parse *pParse, 
+  Fts5ExprPhrase *pPhrase, 
+  Fts5Token *pToken,
+  int bPrefix
+);
+
+static void sqlite3Fts5ParseSetCaret(Fts5ExprPhrase*);
+
+static Fts5ExprNearset *sqlite3Fts5ParseNearset(
+  Fts5Parse*, 
+  Fts5ExprNearset*,
+  Fts5ExprPhrase* 
+);
+
+static Fts5Colset *sqlite3Fts5ParseColset(
+  Fts5Parse*, 
+  Fts5Colset*, 
+  Fts5Token *
+);
+
+static void sqlite3Fts5ParsePhraseFree(Fts5ExprPhrase*);
+static void sqlite3Fts5ParseNearsetFree(Fts5ExprNearset*);
+static void sqlite3Fts5ParseNodeFree(Fts5ExprNode*);
+
+static void sqlite3Fts5ParseSetDistance(Fts5Parse*, Fts5ExprNearset*, Fts5Token*);
+static void sqlite3Fts5ParseSetColset(Fts5Parse*, Fts5ExprNode*, Fts5Colset*);
+static Fts5Colset *sqlite3Fts5ParseColsetInvert(Fts5Parse*, Fts5Colset*);
+static void sqlite3Fts5ParseFinished(Fts5Parse *pParse, Fts5ExprNode *p);
+static void sqlite3Fts5ParseNear(Fts5Parse *pParse, Fts5Token*);
+
+/*
+** End of interface to code in fts5_expr.c.
+**************************************************************************/
+
+
+
+/**************************************************************************
+** Interface to code in fts5_aux.c. 
+*/
+
+static int sqlite3Fts5AuxInit(fts5_api*);
+/*
+** End of interface to code in fts5_aux.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_tokenizer.c. 
+*/
+
+static int sqlite3Fts5TokenizerInit(fts5_api*);
+static int sqlite3Fts5TokenizerPattern(
+    int (*xCreate)(void*, const char**, int, Fts5Tokenizer**),
+    Fts5Tokenizer *pTok
+);
+/*
+** End of interface to code in fts5_tokenizer.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_vocab.c. 
+*/
+
+static int sqlite3Fts5VocabInit(Fts5Global*, sqlite3*);
+
+/*
+** End of interface to code in fts5_vocab.c.
+**************************************************************************/
+
+
+/**************************************************************************
+** Interface to automatically generated code in fts5_unicode2.c. 
+*/
+static int sqlite3Fts5UnicodeIsdiacritic(int c);
+static int sqlite3Fts5UnicodeFold(int c, int bRemoveDiacritic);
+
+static int sqlite3Fts5UnicodeCatParse(const char*, u8*);
+static int sqlite3Fts5UnicodeCategory(u32 iCode);
+static void sqlite3Fts5UnicodeAscii(u8*, u8*);
+/*
+** End of interface to code in fts5_unicode2.c.
+**************************************************************************/
+
+#endif
+
+#line 1 "fts5parse.h"
+#define FTS5_OR                               1
+#define FTS5_AND                              2
+#define FTS5_NOT                              3
+#define FTS5_TERM                             4
+#define FTS5_COLON                            5
+#define FTS5_MINUS                            6
+#define FTS5_LCP                              7
+#define FTS5_RCP                              8
+#define FTS5_STRING                           9
+#define FTS5_LP                              10
+#define FTS5_RP                              11
+#define FTS5_CARET                           12
+#define FTS5_COMMA                           13
+#define FTS5_PLUS                            14
+#define FTS5_STAR                            15
+
+#line 1 "fts5parse.c"
+/* This file is automatically generated by Lemon from input grammar
+** source file "fts5parse.y".
+*/
+/*
+** 2000-05-29
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** Driver template for the LEMON parser generator.
+**
+** The "lemon" program processes an LALR(1) input grammar file, then uses
+** this template to construct a parser.  The "lemon" program inserts text
+** at each "%%" line.  Also, any "P-a-r-s-e" identifer prefix (without the
+** interstitial "-" characters) contained in this template is changed into
+** the value of the %name directive from the grammar.  Otherwise, the content
+** of this template is copied straight through into the generate parser
+** source file.
+**
+** The following is the concatenation of all %include directives from the
+** input grammar file:
+*/
+/************ Begin %include sections from the grammar ************************/
+#line 47 "fts5parse.y"
+
+/* #include "fts5Int.h" */
+/* #include "fts5parse.h" */
+
+/*
+** Disable all error recovery processing in the parser push-down
+** automaton.
+*/
+#define fts5YYNOERRORRECOVERY 1
+
+/*
+** Make fts5yytestcase() the same as testcase()
+*/
+#define fts5yytestcase(X) testcase(X)
+
+/*
+** Indicate that sqlite3ParserFree() will never be called with a null
+** pointer.
+*/
+#define fts5YYPARSEFREENOTNULL 1
+
+/*
+** Alternative datatype for the argument to the malloc() routine passed
+** into sqlite3ParserAlloc().  The default is size_t.
+*/
+#define fts5YYMALLOCARGTYPE  u64
+
+#line 58 "fts5parse.sql"
+/**************** End of %include directives **********************************/
+/* These constants specify the various numeric values for terminal symbols.
+***************** Begin token definitions *************************************/
+#ifndef FTS5_OR
+#define FTS5_OR                              1
+#define FTS5_AND                             2
+#define FTS5_NOT                             3
+#define FTS5_TERM                            4
+#define FTS5_COLON                           5
+#define FTS5_MINUS                           6
+#define FTS5_LCP                             7
+#define FTS5_RCP                             8
+#define FTS5_STRING                          9
+#define FTS5_LP                             10
+#define FTS5_RP                             11
+#define FTS5_CARET                          12
+#define FTS5_COMMA                          13
+#define FTS5_PLUS                           14
+#define FTS5_STAR                           15
+#endif
+/**************** End token definitions ***************************************/
+
+/* The next sections is a series of control #defines.
+** various aspects of the generated parser.
+**    fts5YYCODETYPE         is the data type used to store the integer codes
+**                       that represent terminal and non-terminal symbols.
+**                       "unsigned char" is used if there are fewer than
+**                       256 symbols.  Larger types otherwise.
+**    fts5YYNOCODE           is a number of type fts5YYCODETYPE that is not used for
+**                       any terminal or nonterminal symbol.
+**    fts5YYFALLBACK         If defined, this indicates that one or more tokens
+**                       (also known as: "terminal symbols") have fall-back
+**                       values which should be used if the original symbol
+**                       would not parse.  This permits keywords to sometimes
+**                       be used as identifiers, for example.
+**    fts5YYACTIONTYPE       is the data type used for "action codes" - numbers
+**                       that indicate what to do in response to the next
+**                       token.
+**    sqlite3Fts5ParserFTS5TOKENTYPE     is the data type used for minor type for terminal
+**                       symbols.  Background: A "minor type" is a semantic
+**                       value associated with a terminal or non-terminal
+**                       symbols.  For example, for an "ID" terminal symbol,
+**                       the minor type might be the name of the identifier.
+**                       Each non-terminal can have a different minor type.
+**                       Terminal symbols all have the same minor type, though.
+**                       This macros defines the minor type for terminal 
+**                       symbols.
+**    fts5YYMINORTYPE        is the data type used for all minor types.
+**                       This is typically a union of many types, one of
+**                       which is sqlite3Fts5ParserFTS5TOKENTYPE.  The entry in the union
+**                       for terminal symbols is called "fts5yy0".
+**    fts5YYSTACKDEPTH       is the maximum depth of the parser's stack.  If
+**                       zero the stack is dynamically sized using realloc()
+**    sqlite3Fts5ParserARG_SDECL     A static variable declaration for the %extra_argument
+**    sqlite3Fts5ParserARG_PDECL     A parameter declaration for the %extra_argument
+**    sqlite3Fts5ParserARG_PARAM     Code to pass %extra_argument as a subroutine parameter
+**    sqlite3Fts5ParserARG_STORE     Code to store %extra_argument into fts5yypParser
+**    sqlite3Fts5ParserARG_FETCH     Code to extract %extra_argument from fts5yypParser
+**    sqlite3Fts5ParserCTX_*         As sqlite3Fts5ParserARG_ except for %extra_context
+**    fts5YYERRORSYMBOL      is the code number of the error symbol.  If not
+**                       defined, then do no error processing.
+**    fts5YYNSTATE           the combined number of states.
+**    fts5YYNRULE            the number of rules in the grammar
+**    fts5YYNFTS5TOKEN           Number of terminal symbols
+**    fts5YY_MAX_SHIFT       Maximum value for shift actions
+**    fts5YY_MIN_SHIFTREDUCE Minimum value for shift-reduce actions
+**    fts5YY_MAX_SHIFTREDUCE Maximum value for shift-reduce actions
+**    fts5YY_ERROR_ACTION    The fts5yy_action[] code for syntax error
+**    fts5YY_ACCEPT_ACTION   The fts5yy_action[] code for accept
+**    fts5YY_NO_ACTION       The fts5yy_action[] code for no-op
+**    fts5YY_MIN_REDUCE      Minimum value for reduce actions
+**    fts5YY_MAX_REDUCE      Maximum value for reduce actions
+*/
+#ifndef INTERFACE
+# define INTERFACE 1
+#endif
+/************* Begin control #defines *****************************************/
+#define fts5YYCODETYPE unsigned char
+#define fts5YYNOCODE 27
+#define fts5YYACTIONTYPE unsigned char
+#define sqlite3Fts5ParserFTS5TOKENTYPE Fts5Token
+typedef union {
+  int fts5yyinit;
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yy0;
+  int fts5yy4;
+  Fts5Colset* fts5yy11;
+  Fts5ExprNode* fts5yy24;
+  Fts5ExprNearset* fts5yy46;
+  Fts5ExprPhrase* fts5yy53;
+} fts5YYMINORTYPE;
+#ifndef fts5YYSTACKDEPTH
+#define fts5YYSTACKDEPTH 100
+#endif
+#define sqlite3Fts5ParserARG_SDECL Fts5Parse *pParse;
+#define sqlite3Fts5ParserARG_PDECL ,Fts5Parse *pParse
+#define sqlite3Fts5ParserARG_PARAM ,pParse
+#define sqlite3Fts5ParserARG_FETCH Fts5Parse *pParse=fts5yypParser->pParse;
+#define sqlite3Fts5ParserARG_STORE fts5yypParser->pParse=pParse;
+#define sqlite3Fts5ParserCTX_SDECL
+#define sqlite3Fts5ParserCTX_PDECL
+#define sqlite3Fts5ParserCTX_PARAM
+#define sqlite3Fts5ParserCTX_FETCH
+#define sqlite3Fts5ParserCTX_STORE
+#define fts5YYNSTATE             35
+#define fts5YYNRULE              28
+#define fts5YYNRULE_WITH_ACTION  28
+#define fts5YYNFTS5TOKEN             16
+#define fts5YY_MAX_SHIFT         34
+#define fts5YY_MIN_SHIFTREDUCE   52
+#define fts5YY_MAX_SHIFTREDUCE   79
+#define fts5YY_ERROR_ACTION      80
+#define fts5YY_ACCEPT_ACTION     81
+#define fts5YY_NO_ACTION         82
+#define fts5YY_MIN_REDUCE        83
+#define fts5YY_MAX_REDUCE        110
+/************* End control #defines *******************************************/
+#define fts5YY_NLOOKAHEAD ((int)(sizeof(fts5yy_lookahead)/sizeof(fts5yy_lookahead[0])))
+
+/* Define the fts5yytestcase() macro to be a no-op if is not already defined
+** otherwise.
+**
+** Applications can choose to define fts5yytestcase() in the %include section
+** to a macro that can assist in verifying code coverage.  For production
+** code the fts5yytestcase() macro should be turned off.  But it is useful
+** for testing.
+*/
+#ifndef fts5yytestcase
+# define fts5yytestcase(X)
+#endif
+
+
+/* Next are the tables used to determine what action to take based on the
+** current state and lookahead token.  These tables are used to implement
+** functions that take a state number and lookahead value and return an
+** action integer.  
+**
+** Suppose the action integer is N.  Then the action is determined as
+** follows
+**
+**   0 <= N <= fts5YY_MAX_SHIFT             Shift N.  That is, push the lookahead
+**                                      token onto the stack and goto state N.
+**
+**   N between fts5YY_MIN_SHIFTREDUCE       Shift to an arbitrary state then
+**     and fts5YY_MAX_SHIFTREDUCE           reduce by rule N-fts5YY_MIN_SHIFTREDUCE.
+**
+**   N == fts5YY_ERROR_ACTION               A syntax error has occurred.
+**
+**   N == fts5YY_ACCEPT_ACTION              The parser accepts its input.
+**
+**   N == fts5YY_NO_ACTION                  No such action.  Denotes unused
+**                                      slots in the fts5yy_action[] table.
+**
+**   N between fts5YY_MIN_REDUCE            Reduce by rule N-fts5YY_MIN_REDUCE
+**     and fts5YY_MAX_REDUCE
+**
+** The action table is constructed as a single large table named fts5yy_action[].
+** Given state S and lookahead X, the action is computed as either:
+**
+**    (A)   N = fts5yy_action[ fts5yy_shift_ofst[S] + X ]
+**    (B)   N = fts5yy_default[S]
+**
+** The (A) formula is preferred.  The B formula is used instead if
+** fts5yy_lookahead[fts5yy_shift_ofst[S]+X] is not equal to X.
+**
+** The formulas above are for computing the action when the lookahead is
+** a terminal symbol.  If the lookahead is a non-terminal (as occurs after
+** a reduce action) then the fts5yy_reduce_ofst[] array is used in place of
+** the fts5yy_shift_ofst[] array.
+**
+** The following are the tables generated in this section:
+**
+**  fts5yy_action[]        A single table containing all actions.
+**  fts5yy_lookahead[]     A table containing the lookahead for each entry in
+**                     fts5yy_action.  Used to detect hash collisions.
+**  fts5yy_shift_ofst[]    For each state, the offset into fts5yy_action for
+**                     shifting terminals.
+**  fts5yy_reduce_ofst[]   For each state, the offset into fts5yy_action for
+**                     shifting non-terminals after a reduce.
+**  fts5yy_default[]       Default action for each state.
+**
+*********** Begin parsing tables **********************************************/
+#define fts5YY_ACTTAB_COUNT (105)
+static const fts5YYACTIONTYPE fts5yy_action[] = {
+ /*     0 */    81,   20,   96,    6,   28,   99,   98,   26,   26,   18,
+ /*    10 */    96,    6,   28,   17,   98,   56,   26,   19,   96,    6,
+ /*    20 */    28,   14,   98,   14,   26,   31,   92,   96,    6,   28,
+ /*    30 */   108,   98,   25,   26,   21,   96,    6,   28,   78,   98,
+ /*    40 */    58,   26,   29,   96,    6,   28,  107,   98,   22,   26,
+ /*    50 */    24,   16,   12,   11,    1,   13,   13,   24,   16,   23,
+ /*    60 */    11,   33,   34,   13,   97,    8,   27,   32,   98,    7,
+ /*    70 */    26,    3,    4,    5,    3,    4,    5,    3,   83,    4,
+ /*    80 */     5,    3,   63,    5,    3,   62,   12,    2,   86,   13,
+ /*    90 */     9,   30,   10,   10,   54,   57,   75,   78,   78,   53,
+ /*   100 */    57,   15,   82,   82,   71,
+};
+static const fts5YYCODETYPE fts5yy_lookahead[] = {
+ /*     0 */    16,   17,   18,   19,   20,   22,   22,   24,   24,   17,
+ /*    10 */    18,   19,   20,    7,   22,    9,   24,   17,   18,   19,
+ /*    20 */    20,    9,   22,    9,   24,   13,   17,   18,   19,   20,
+ /*    30 */    26,   22,   24,   24,   17,   18,   19,   20,   15,   22,
+ /*    40 */     9,   24,   17,   18,   19,   20,   26,   22,   21,   24,
+ /*    50 */     6,    7,    9,    9,   10,   12,   12,    6,    7,   21,
+ /*    60 */     9,   24,   25,   12,   18,    5,   20,   14,   22,    5,
+ /*    70 */    24,    3,    1,    2,    3,    1,    2,    3,    0,    1,
+ /*    80 */     2,    3,   11,    2,    3,   11,    9,   10,    5,   12,
+ /*    90 */    23,   24,   10,   10,    8,    9,    9,   15,   15,    8,
+ /*   100 */     9,    9,   27,   27,   11,   27,   27,   27,   27,   27,
+ /*   110 */    27,   27,   27,   27,   27,   27,   27,   27,   27,   27,
+ /*   120 */    27,
+};
+#define fts5YY_SHIFT_COUNT    (34)
+#define fts5YY_SHIFT_MIN      (0)
+#define fts5YY_SHIFT_MAX      (93)
+static const unsigned char fts5yy_shift_ofst[] = {
+ /*     0 */    44,   44,   44,   44,   44,   44,   51,   77,   43,   12,
+ /*    10 */    14,   83,   82,   14,   23,   23,   31,   31,   71,   74,
+ /*    20 */    78,   81,   86,   91,    6,   53,   53,   60,   64,   68,
+ /*    30 */    53,   87,   92,   53,   93,
+};
+#define fts5YY_REDUCE_COUNT (17)
+#define fts5YY_REDUCE_MIN   (-17)
+#define fts5YY_REDUCE_MAX   (67)
+static const signed char fts5yy_reduce_ofst[] = {
+ /*     0 */   -16,   -8,    0,    9,   17,   25,   46,  -17,  -17,   37,
+ /*    10 */    67,    4,    4,    8,    4,   20,   27,   38,
+};
+static const fts5YYACTIONTYPE fts5yy_default[] = {
+ /*     0 */    80,   80,   80,   80,   80,   80,   95,   80,   80,  105,
+ /*    10 */    80,  110,  110,   80,  110,  110,   80,   80,   80,   80,
+ /*    20 */    80,   91,   80,   80,   80,  101,  100,   80,   80,   90,
+ /*    30 */   103,   80,   80,  104,   80,
+};
+/********** End of lemon-generated parsing tables *****************************/
+
+/* The next table maps tokens (terminal symbols) into fallback tokens.  
+** If a construct like the following:
+** 
+**      %fallback ID X Y Z.
+**
+** appears in the grammar, then ID becomes a fallback token for X, Y,
+** and Z.  Whenever one of the tokens X, Y, or Z is input to the parser
+** but it does not parse, the type of the token is changed to ID and
+** the parse is retried before an error is thrown.
+**
+** This feature can be used, for example, to cause some keywords in a language
+** to revert to identifiers if they keyword does not apply in the context where
+** it appears.
+*/
+#ifdef fts5YYFALLBACK
+static const fts5YYCODETYPE fts5yyFallback[] = {
+};
+#endif /* fts5YYFALLBACK */
+
+/* The following structure represents a single element of the
+** parser's stack.  Information stored includes:
+**
+**   +  The state number for the parser at this level of the stack.
+**
+**   +  The value of the token stored at this level of the stack.
+**      (In other words, the "major" token.)
+**
+**   +  The semantic value stored at this level of the stack.  This is
+**      the information used by the action routines in the grammar.
+**      It is sometimes called the "minor" token.
+**
+** After the "shift" half of a SHIFTREDUCE action, the stateno field
+** actually contains the reduce action for the second half of the
+** SHIFTREDUCE.
+*/
+struct fts5yyStackEntry {
+  fts5YYACTIONTYPE stateno;  /* The state-number, or reduce action in SHIFTREDUCE */
+  fts5YYCODETYPE major;      /* The major token value.  This is the code
+                         ** number for the token at this stack level */
+  fts5YYMINORTYPE minor;     /* The user-supplied minor token value.  This
+                         ** is the value of the token  */
+};
+typedef struct fts5yyStackEntry fts5yyStackEntry;
+
+/* The state of the parser is completely contained in an instance of
+** the following structure */
+struct fts5yyParser {
+  fts5yyStackEntry *fts5yytos;          /* Pointer to top element of the stack */
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+  int fts5yyhwm;                    /* High-water mark of the stack */
+#endif
+#ifndef fts5YYNOERRORRECOVERY
+  int fts5yyerrcnt;                 /* Shifts left before out of the error */
+#endif
+  sqlite3Fts5ParserARG_SDECL                /* A place to hold %extra_argument */
+  sqlite3Fts5ParserCTX_SDECL                /* A place to hold %extra_context */
+#if fts5YYSTACKDEPTH<=0
+  int fts5yystksz;                  /* Current side of the stack */
+  fts5yyStackEntry *fts5yystack;        /* The parser's stack */
+  fts5yyStackEntry fts5yystk0;          /* First stack entry */
+#else
+  fts5yyStackEntry fts5yystack[fts5YYSTACKDEPTH];  /* The parser's stack */
+  fts5yyStackEntry *fts5yystackEnd;            /* Last entry in the stack */
+#endif
+};
+typedef struct fts5yyParser fts5yyParser;
+
+#include <assert.h>
+#ifndef NDEBUG
+#include <stdio.h>
+static FILE *fts5yyTraceFILE = 0;
+static char *fts5yyTracePrompt = 0;
+#endif /* NDEBUG */
+
+#ifndef NDEBUG
+/* 
+** Turn parser tracing on by giving a stream to which to write the trace
+** and a prompt to preface each trace message.  Tracing is turned off
+** by making either argument NULL 
+**
+** Inputs:
+** <ul>
+** <li> A FILE* to which trace output should be written.
+**      If NULL, then tracing is turned off.
+** <li> A prefix string written at the beginning of every
+**      line of trace output.  If NULL, then tracing is
+**      turned off.
+** </ul>
+**
+** Outputs:
+** None.
+*/
+static void sqlite3Fts5ParserTrace(FILE *TraceFILE, char *zTracePrompt){
+  fts5yyTraceFILE = TraceFILE;
+  fts5yyTracePrompt = zTracePrompt;
+  if( fts5yyTraceFILE==0 ) fts5yyTracePrompt = 0;
+  else if( fts5yyTracePrompt==0 ) fts5yyTraceFILE = 0;
+}
+#endif /* NDEBUG */
+
+#if defined(fts5YYCOVERAGE) || !defined(NDEBUG)
+/* For tracing shifts, the names of all terminals and nonterminals
+** are required.  The following table supplies these names */
+static const char *const fts5yyTokenName[] = { 
+  /*    0 */ "$",
+  /*    1 */ "OR",
+  /*    2 */ "AND",
+  /*    3 */ "NOT",
+  /*    4 */ "TERM",
+  /*    5 */ "COLON",
+  /*    6 */ "MINUS",
+  /*    7 */ "LCP",
+  /*    8 */ "RCP",
+  /*    9 */ "STRING",
+  /*   10 */ "LP",
+  /*   11 */ "RP",
+  /*   12 */ "CARET",
+  /*   13 */ "COMMA",
+  /*   14 */ "PLUS",
+  /*   15 */ "STAR",
+  /*   16 */ "input",
+  /*   17 */ "expr",
+  /*   18 */ "cnearset",
+  /*   19 */ "exprlist",
+  /*   20 */ "colset",
+  /*   21 */ "colsetlist",
+  /*   22 */ "nearset",
+  /*   23 */ "nearphrases",
+  /*   24 */ "phrase",
+  /*   25 */ "neardist_opt",
+  /*   26 */ "star_opt",
+};
+#endif /* defined(fts5YYCOVERAGE) || !defined(NDEBUG) */
+
+#ifndef NDEBUG
+/* For tracing reduce actions, the names of all rules are required.
+*/
+static const char *const fts5yyRuleName[] = {
+ /*   0 */ "input ::= expr",
+ /*   1 */ "colset ::= MINUS LCP colsetlist RCP",
+ /*   2 */ "colset ::= LCP colsetlist RCP",
+ /*   3 */ "colset ::= STRING",
+ /*   4 */ "colset ::= MINUS STRING",
+ /*   5 */ "colsetlist ::= colsetlist STRING",
+ /*   6 */ "colsetlist ::= STRING",
+ /*   7 */ "expr ::= expr AND expr",
+ /*   8 */ "expr ::= expr OR expr",
+ /*   9 */ "expr ::= expr NOT expr",
+ /*  10 */ "expr ::= colset COLON LP expr RP",
+ /*  11 */ "expr ::= LP expr RP",
+ /*  12 */ "expr ::= exprlist",
+ /*  13 */ "exprlist ::= cnearset",
+ /*  14 */ "exprlist ::= exprlist cnearset",
+ /*  15 */ "cnearset ::= nearset",
+ /*  16 */ "cnearset ::= colset COLON nearset",
+ /*  17 */ "nearset ::= phrase",
+ /*  18 */ "nearset ::= CARET phrase",
+ /*  19 */ "nearset ::= STRING LP nearphrases neardist_opt RP",
+ /*  20 */ "nearphrases ::= phrase",
+ /*  21 */ "nearphrases ::= nearphrases phrase",
+ /*  22 */ "neardist_opt ::=",
+ /*  23 */ "neardist_opt ::= COMMA STRING",
+ /*  24 */ "phrase ::= phrase PLUS STRING star_opt",
+ /*  25 */ "phrase ::= STRING star_opt",
+ /*  26 */ "star_opt ::= STAR",
+ /*  27 */ "star_opt ::=",
+};
+#endif /* NDEBUG */
+
+
+#if fts5YYSTACKDEPTH<=0
+/*
+** Try to increase the size of the parser stack.  Return the number
+** of errors.  Return 0 on success.
+*/
+static int fts5yyGrowStack(fts5yyParser *p){
+  int newSize;
+  int idx;
+  fts5yyStackEntry *pNew;
+
+  newSize = p->fts5yystksz*2 + 100;
+  idx = p->fts5yytos ? (int)(p->fts5yytos - p->fts5yystack) : 0;
+  if( p->fts5yystack==&p->fts5yystk0 ){
+    pNew = malloc(newSize*sizeof(pNew[0]));
+    if( pNew ) pNew[0] = p->fts5yystk0;
+  }else{
+    pNew = realloc(p->fts5yystack, newSize*sizeof(pNew[0]));
+  }
+  if( pNew ){
+    p->fts5yystack = pNew;
+    p->fts5yytos = &p->fts5yystack[idx];
+#ifndef NDEBUG
+    if( fts5yyTraceFILE ){
+      fprintf(fts5yyTraceFILE,"%sStack grows from %d to %d entries.\n",
+              fts5yyTracePrompt, p->fts5yystksz, newSize);
+    }
+#endif
+    p->fts5yystksz = newSize;
+  }
+  return pNew==0; 
+}
+#endif
+
+/* Datatype of the argument to the memory allocated passed as the
+** second argument to sqlite3Fts5ParserAlloc() below.  This can be changed by
+** putting an appropriate #define in the %include section of the input
+** grammar.
+*/
+#ifndef fts5YYMALLOCARGTYPE
+# define fts5YYMALLOCARGTYPE size_t
+#endif
+
+/* Initialize a new parser that has already been allocated.
+*/
+static void sqlite3Fts5ParserInit(void *fts5yypRawParser sqlite3Fts5ParserCTX_PDECL){
+  fts5yyParser *fts5yypParser = (fts5yyParser*)fts5yypRawParser;
+  sqlite3Fts5ParserCTX_STORE
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+  fts5yypParser->fts5yyhwm = 0;
+#endif
+#if fts5YYSTACKDEPTH<=0
+  fts5yypParser->fts5yytos = NULL;
+  fts5yypParser->fts5yystack = NULL;
+  fts5yypParser->fts5yystksz = 0;
+  if( fts5yyGrowStack(fts5yypParser) ){
+    fts5yypParser->fts5yystack = &fts5yypParser->fts5yystk0;
+    fts5yypParser->fts5yystksz = 1;
+  }
+#endif
+#ifndef fts5YYNOERRORRECOVERY
+  fts5yypParser->fts5yyerrcnt = -1;
+#endif
+  fts5yypParser->fts5yytos = fts5yypParser->fts5yystack;
+  fts5yypParser->fts5yystack[0].stateno = 0;
+  fts5yypParser->fts5yystack[0].major = 0;
+#if fts5YYSTACKDEPTH>0
+  fts5yypParser->fts5yystackEnd = &fts5yypParser->fts5yystack[fts5YYSTACKDEPTH-1];
+#endif
+}
+
+#ifndef sqlite3Fts5Parser_ENGINEALWAYSONSTACK
+/* 
+** This function allocates a new parser.
+** The only argument is a pointer to a function which works like
+** malloc.
+**
+** Inputs:
+** A pointer to the function used to allocate memory.
+**
+** Outputs:
+** A pointer to a parser.  This pointer is used in subsequent calls
+** to sqlite3Fts5Parser and sqlite3Fts5ParserFree.
+*/
+static void *sqlite3Fts5ParserAlloc(void *(*mallocProc)(fts5YYMALLOCARGTYPE) sqlite3Fts5ParserCTX_PDECL){
+  fts5yyParser *fts5yypParser;
+  fts5yypParser = (fts5yyParser*)(*mallocProc)( (fts5YYMALLOCARGTYPE)sizeof(fts5yyParser) );
+  if( fts5yypParser ){
+    sqlite3Fts5ParserCTX_STORE
+    sqlite3Fts5ParserInit(fts5yypParser sqlite3Fts5ParserCTX_PARAM);
+  }
+  return (void*)fts5yypParser;
+}
+#endif /* sqlite3Fts5Parser_ENGINEALWAYSONSTACK */
+
+
+/* The following function deletes the "minor type" or semantic value
+** associated with a symbol.  The symbol can be either a terminal
+** or nonterminal. "fts5yymajor" is the symbol code, and "fts5yypminor" is
+** a pointer to the value to be deleted.  The code used to do the 
+** deletions is derived from the %destructor and/or %token_destructor
+** directives of the input grammar.
+*/
+static void fts5yy_destructor(
+  fts5yyParser *fts5yypParser,    /* The parser */
+  fts5YYCODETYPE fts5yymajor,     /* Type code for object to destroy */
+  fts5YYMINORTYPE *fts5yypminor   /* The object to be destroyed */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+  switch( fts5yymajor ){
+    /* Here is inserted the actions which take place when a
+    ** terminal or non-terminal is destroyed.  This can happen
+    ** when the symbol is popped from the stack during a
+    ** reduce or during error processing or when a parser is 
+    ** being destroyed before it is finished parsing.
+    **
+    ** Note: during a reduce, the only symbols destroyed are those
+    ** which appear on the RHS of the rule, but which are *not* used
+    ** inside the C code.
+    */
+/********* Begin destructor definitions ***************************************/
+    case 16: /* input */
+{
+#line 83 "fts5parse.y"
+ (void)pParse; 
+#line 587 "fts5parse.sql"
+}
+      break;
+    case 17: /* expr */
+    case 18: /* cnearset */
+    case 19: /* exprlist */
+{
+#line 89 "fts5parse.y"
+ sqlite3Fts5ParseNodeFree((fts5yypminor->fts5yy24)); 
+#line 596 "fts5parse.sql"
+}
+      break;
+    case 20: /* colset */
+    case 21: /* colsetlist */
+{
+#line 93 "fts5parse.y"
+ sqlite3_free((fts5yypminor->fts5yy11)); 
+#line 604 "fts5parse.sql"
+}
+      break;
+    case 22: /* nearset */
+    case 23: /* nearphrases */
+{
+#line 148 "fts5parse.y"
+ sqlite3Fts5ParseNearsetFree((fts5yypminor->fts5yy46)); 
+#line 612 "fts5parse.sql"
+}
+      break;
+    case 24: /* phrase */
+{
+#line 183 "fts5parse.y"
+ sqlite3Fts5ParsePhraseFree((fts5yypminor->fts5yy53)); 
+#line 619 "fts5parse.sql"
+}
+      break;
+/********* End destructor definitions *****************************************/
+    default:  break;   /* If no destructor action specified: do nothing */
+  }
+}
+
+/*
+** Pop the parser's stack once.
+**
+** If there is a destructor routine associated with the token which
+** is popped from the stack, then call it.
+*/
+static void fts5yy_pop_parser_stack(fts5yyParser *pParser){
+  fts5yyStackEntry *fts5yytos;
+  assert( pParser->fts5yytos!=0 );
+  assert( pParser->fts5yytos > pParser->fts5yystack );
+  fts5yytos = pParser->fts5yytos--;
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fprintf(fts5yyTraceFILE,"%sPopping %s\n",
+      fts5yyTracePrompt,
+      fts5yyTokenName[fts5yytos->major]);
+  }
+#endif
+  fts5yy_destructor(pParser, fts5yytos->major, &fts5yytos->minor);
+}
+
+/*
+** Clear all secondary memory allocations from the parser
+*/
+static void sqlite3Fts5ParserFinalize(void *p){
+  fts5yyParser *pParser = (fts5yyParser*)p;
+  while( pParser->fts5yytos>pParser->fts5yystack ) fts5yy_pop_parser_stack(pParser);
+#if fts5YYSTACKDEPTH<=0
+  if( pParser->fts5yystack!=&pParser->fts5yystk0 ) free(pParser->fts5yystack);
+#endif
+}
+
+#ifndef sqlite3Fts5Parser_ENGINEALWAYSONSTACK
+/* 
+** Deallocate and destroy a parser.  Destructors are called for
+** all stack elements before shutting the parser down.
+**
+** If the fts5YYPARSEFREENEVERNULL macro exists (for example because it
+** is defined in a %include section of the input grammar) then it is
+** assumed that the input pointer is never NULL.
+*/
+static void sqlite3Fts5ParserFree(
+  void *p,                    /* The parser to be deleted */
+  void (*freeProc)(void*)     /* Function used to reclaim memory */
+){
+#ifndef fts5YYPARSEFREENEVERNULL
+  if( p==0 ) return;
+#endif
+  sqlite3Fts5ParserFinalize(p);
+  (*freeProc)(p);
+}
+#endif /* sqlite3Fts5Parser_ENGINEALWAYSONSTACK */
+
+/*
+** Return the peak depth of the stack for a parser.
+*/
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+static int sqlite3Fts5ParserStackPeak(void *p){
+  fts5yyParser *pParser = (fts5yyParser*)p;
+  return pParser->fts5yyhwm;
+}
+#endif
+
+/* This array of booleans keeps track of the parser statement
+** coverage.  The element fts5yycoverage[X][Y] is set when the parser
+** is in state X and has a lookahead token Y.  In a well-tested
+** systems, every element of this matrix should end up being set.
+*/
+#if defined(fts5YYCOVERAGE)
+static unsigned char fts5yycoverage[fts5YYNSTATE][fts5YYNFTS5TOKEN];
+#endif
+
+/*
+** Write into out a description of every state/lookahead combination that
+**
+**   (1)  has not been used by the parser, and
+**   (2)  is not a syntax error.
+**
+** Return the number of missed state/lookahead combinations.
+*/
+#if defined(fts5YYCOVERAGE)
+static int sqlite3Fts5ParserCoverage(FILE *out){
+  int stateno, iLookAhead, i;
+  int nMissed = 0;
+  for(stateno=0; stateno<fts5YYNSTATE; stateno++){
+    i = fts5yy_shift_ofst[stateno];
+    for(iLookAhead=0; iLookAhead<fts5YYNFTS5TOKEN; iLookAhead++){
+      if( fts5yy_lookahead[i+iLookAhead]!=iLookAhead ) continue;
+      if( fts5yycoverage[stateno][iLookAhead]==0 ) nMissed++;
+      if( out ){
+        fprintf(out,"State %d lookahead %s %s\n", stateno,
+                fts5yyTokenName[iLookAhead],
+                fts5yycoverage[stateno][iLookAhead] ? "ok" : "missed");
+      }
+    }
+  }
+  return nMissed;
+}
+#endif
+
+/*
+** Find the appropriate action for a parser given the terminal
+** look-ahead token iLookAhead.
+*/
+static fts5YYACTIONTYPE fts5yy_find_shift_action(
+  fts5YYCODETYPE iLookAhead,    /* The look-ahead token */
+  fts5YYACTIONTYPE stateno      /* Current state number */
+){
+  int i;
+
+  if( stateno>fts5YY_MAX_SHIFT ) return stateno;
+  assert( stateno <= fts5YY_SHIFT_COUNT );
+#if defined(fts5YYCOVERAGE)
+  fts5yycoverage[stateno][iLookAhead] = 1;
+#endif
+  do{
+    i = fts5yy_shift_ofst[stateno];
+    assert( i>=0 );
+    assert( i<=fts5YY_ACTTAB_COUNT );
+    assert( i+fts5YYNFTS5TOKEN<=(int)fts5YY_NLOOKAHEAD );
+    assert( iLookAhead!=fts5YYNOCODE );
+    assert( iLookAhead < fts5YYNFTS5TOKEN );
+    i += iLookAhead;
+    assert( i<(int)fts5YY_NLOOKAHEAD );
+    if( fts5yy_lookahead[i]!=iLookAhead ){
+#ifdef fts5YYFALLBACK
+      fts5YYCODETYPE iFallback;            /* Fallback token */
+      assert( iLookAhead<sizeof(fts5yyFallback)/sizeof(fts5yyFallback[0]) );
+      iFallback = fts5yyFallback[iLookAhead];
+      if( iFallback!=0 ){
+#ifndef NDEBUG
+        if( fts5yyTraceFILE ){
+          fprintf(fts5yyTraceFILE, "%sFALLBACK %s => %s\n",
+             fts5yyTracePrompt, fts5yyTokenName[iLookAhead], fts5yyTokenName[iFallback]);
+        }
+#endif
+        assert( fts5yyFallback[iFallback]==0 ); /* Fallback loop must terminate */
+        iLookAhead = iFallback;
+        continue;
+      }
+#endif
+#ifdef fts5YYWILDCARD
+      {
+        int j = i - iLookAhead + fts5YYWILDCARD;
+        assert( j<(int)(sizeof(fts5yy_lookahead)/sizeof(fts5yy_lookahead[0])) );
+        if( fts5yy_lookahead[j]==fts5YYWILDCARD && iLookAhead>0 ){
+#ifndef NDEBUG
+          if( fts5yyTraceFILE ){
+            fprintf(fts5yyTraceFILE, "%sWILDCARD %s => %s\n",
+               fts5yyTracePrompt, fts5yyTokenName[iLookAhead],
+               fts5yyTokenName[fts5YYWILDCARD]);
+          }
+#endif /* NDEBUG */
+          return fts5yy_action[j];
+        }
+      }
+#endif /* fts5YYWILDCARD */
+      return fts5yy_default[stateno];
+    }else{
+      assert( i>=0 && i<(int)(sizeof(fts5yy_action)/sizeof(fts5yy_action[0])) );
+      return fts5yy_action[i];
+    }
+  }while(1);
+}
+
+/*
+** Find the appropriate action for a parser given the non-terminal
+** look-ahead token iLookAhead.
+*/
+static fts5YYACTIONTYPE fts5yy_find_reduce_action(
+  fts5YYACTIONTYPE stateno,     /* Current state number */
+  fts5YYCODETYPE iLookAhead     /* The look-ahead token */
+){
+  int i;
+#ifdef fts5YYERRORSYMBOL
+  if( stateno>fts5YY_REDUCE_COUNT ){
+    return fts5yy_default[stateno];
+  }
+#else
+  assert( stateno<=fts5YY_REDUCE_COUNT );
+#endif
+  i = fts5yy_reduce_ofst[stateno];
+  assert( iLookAhead!=fts5YYNOCODE );
+  i += iLookAhead;
+#ifdef fts5YYERRORSYMBOL
+  if( i<0 || i>=fts5YY_ACTTAB_COUNT || fts5yy_lookahead[i]!=iLookAhead ){
+    return fts5yy_default[stateno];
+  }
+#else
+  assert( i>=0 && i<fts5YY_ACTTAB_COUNT );
+  assert( fts5yy_lookahead[i]==iLookAhead );
+#endif
+  return fts5yy_action[i];
+}
+
+/*
+** The following routine is called if the stack overflows.
+*/
+static void fts5yyStackOverflow(fts5yyParser *fts5yypParser){
+   sqlite3Fts5ParserARG_FETCH
+   sqlite3Fts5ParserCTX_FETCH
+#ifndef NDEBUG
+   if( fts5yyTraceFILE ){
+     fprintf(fts5yyTraceFILE,"%sStack Overflow!\n",fts5yyTracePrompt);
+   }
+#endif
+   while( fts5yypParser->fts5yytos>fts5yypParser->fts5yystack ) fts5yy_pop_parser_stack(fts5yypParser);
+   /* Here code is inserted which will execute if the parser
+   ** stack every overflows */
+/******** Begin %stack_overflow code ******************************************/
+#line 36 "fts5parse.y"
+
+  sqlite3Fts5ParseError(pParse, "fts5: parser stack overflow");
+#line 840 "fts5parse.sql"
+/******** End %stack_overflow code ********************************************/
+   sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument var */
+   sqlite3Fts5ParserCTX_STORE
+}
+
+/*
+** Print tracing information for a SHIFT action
+*/
+#ifndef NDEBUG
+static void fts5yyTraceShift(fts5yyParser *fts5yypParser, int fts5yyNewState, const char *zTag){
+  if( fts5yyTraceFILE ){
+    if( fts5yyNewState<fts5YYNSTATE ){
+      fprintf(fts5yyTraceFILE,"%s%s '%s', go to state %d\n",
+         fts5yyTracePrompt, zTag, fts5yyTokenName[fts5yypParser->fts5yytos->major],
+         fts5yyNewState);
+    }else{
+      fprintf(fts5yyTraceFILE,"%s%s '%s', pending reduce %d\n",
+         fts5yyTracePrompt, zTag, fts5yyTokenName[fts5yypParser->fts5yytos->major],
+         fts5yyNewState - fts5YY_MIN_REDUCE);
+    }
+  }
+}
+#else
+# define fts5yyTraceShift(X,Y,Z)
+#endif
+
+/*
+** Perform a shift action.
+*/
+static void fts5yy_shift(
+  fts5yyParser *fts5yypParser,          /* The parser to be shifted */
+  fts5YYACTIONTYPE fts5yyNewState,      /* The new state to shift in */
+  fts5YYCODETYPE fts5yyMajor,           /* The major token to shift in */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyMinor        /* The minor token to shift in */
+){
+  fts5yyStackEntry *fts5yytos;
+  fts5yypParser->fts5yytos++;
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+  if( (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack)>fts5yypParser->fts5yyhwm ){
+    fts5yypParser->fts5yyhwm++;
+    assert( fts5yypParser->fts5yyhwm == (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack) );
+  }
+#endif
+#if fts5YYSTACKDEPTH>0 
+  if( fts5yypParser->fts5yytos>fts5yypParser->fts5yystackEnd ){
+    fts5yypParser->fts5yytos--;
+    fts5yyStackOverflow(fts5yypParser);
+    return;
+  }
+#else
+  if( fts5yypParser->fts5yytos>=&fts5yypParser->fts5yystack[fts5yypParser->fts5yystksz] ){
+    if( fts5yyGrowStack(fts5yypParser) ){
+      fts5yypParser->fts5yytos--;
+      fts5yyStackOverflow(fts5yypParser);
+      return;
+    }
+  }
+#endif
+  if( fts5yyNewState > fts5YY_MAX_SHIFT ){
+    fts5yyNewState += fts5YY_MIN_REDUCE - fts5YY_MIN_SHIFTREDUCE;
+  }
+  fts5yytos = fts5yypParser->fts5yytos;
+  fts5yytos->stateno = fts5yyNewState;
+  fts5yytos->major = fts5yyMajor;
+  fts5yytos->minor.fts5yy0 = fts5yyMinor;
+  fts5yyTraceShift(fts5yypParser, fts5yyNewState, "Shift");
+}
+
+/* For rule J, fts5yyRuleInfoLhs[J] contains the symbol on the left-hand side
+** of that rule */
+static const fts5YYCODETYPE fts5yyRuleInfoLhs[] = {
+    16,  /* (0) input ::= expr */
+    20,  /* (1) colset ::= MINUS LCP colsetlist RCP */
+    20,  /* (2) colset ::= LCP colsetlist RCP */
+    20,  /* (3) colset ::= STRING */
+    20,  /* (4) colset ::= MINUS STRING */
+    21,  /* (5) colsetlist ::= colsetlist STRING */
+    21,  /* (6) colsetlist ::= STRING */
+    17,  /* (7) expr ::= expr AND expr */
+    17,  /* (8) expr ::= expr OR expr */
+    17,  /* (9) expr ::= expr NOT expr */
+    17,  /* (10) expr ::= colset COLON LP expr RP */
+    17,  /* (11) expr ::= LP expr RP */
+    17,  /* (12) expr ::= exprlist */
+    19,  /* (13) exprlist ::= cnearset */
+    19,  /* (14) exprlist ::= exprlist cnearset */
+    18,  /* (15) cnearset ::= nearset */
+    18,  /* (16) cnearset ::= colset COLON nearset */
+    22,  /* (17) nearset ::= phrase */
+    22,  /* (18) nearset ::= CARET phrase */
+    22,  /* (19) nearset ::= STRING LP nearphrases neardist_opt RP */
+    23,  /* (20) nearphrases ::= phrase */
+    23,  /* (21) nearphrases ::= nearphrases phrase */
+    25,  /* (22) neardist_opt ::= */
+    25,  /* (23) neardist_opt ::= COMMA STRING */
+    24,  /* (24) phrase ::= phrase PLUS STRING star_opt */
+    24,  /* (25) phrase ::= STRING star_opt */
+    26,  /* (26) star_opt ::= STAR */
+    26,  /* (27) star_opt ::= */
+};
+
+/* For rule J, fts5yyRuleInfoNRhs[J] contains the negative of the number
+** of symbols on the right-hand side of that rule. */
+static const signed char fts5yyRuleInfoNRhs[] = {
+   -1,  /* (0) input ::= expr */
+   -4,  /* (1) colset ::= MINUS LCP colsetlist RCP */
+   -3,  /* (2) colset ::= LCP colsetlist RCP */
+   -1,  /* (3) colset ::= STRING */
+   -2,  /* (4) colset ::= MINUS STRING */
+   -2,  /* (5) colsetlist ::= colsetlist STRING */
+   -1,  /* (6) colsetlist ::= STRING */
+   -3,  /* (7) expr ::= expr AND expr */
+   -3,  /* (8) expr ::= expr OR expr */
+   -3,  /* (9) expr ::= expr NOT expr */
+   -5,  /* (10) expr ::= colset COLON LP expr RP */
+   -3,  /* (11) expr ::= LP expr RP */
+   -1,  /* (12) expr ::= exprlist */
+   -1,  /* (13) exprlist ::= cnearset */
+   -2,  /* (14) exprlist ::= exprlist cnearset */
+   -1,  /* (15) cnearset ::= nearset */
+   -3,  /* (16) cnearset ::= colset COLON nearset */
+   -1,  /* (17) nearset ::= phrase */
+   -2,  /* (18) nearset ::= CARET phrase */
+   -5,  /* (19) nearset ::= STRING LP nearphrases neardist_opt RP */
+   -1,  /* (20) nearphrases ::= phrase */
+   -2,  /* (21) nearphrases ::= nearphrases phrase */
+    0,  /* (22) neardist_opt ::= */
+   -2,  /* (23) neardist_opt ::= COMMA STRING */
+   -4,  /* (24) phrase ::= phrase PLUS STRING star_opt */
+   -2,  /* (25) phrase ::= STRING star_opt */
+   -1,  /* (26) star_opt ::= STAR */
+    0,  /* (27) star_opt ::= */
+};
+
+static void fts5yy_accept(fts5yyParser*);  /* Forward Declaration */
+
+/*
+** Perform a reduce action and the shift that must immediately
+** follow the reduce.
+**
+** The fts5yyLookahead and fts5yyLookaheadToken parameters provide reduce actions
+** access to the lookahead token (if any).  The fts5yyLookahead will be fts5YYNOCODE
+** if the lookahead token has already been consumed.  As this procedure is
+** only called from one place, optimizing compilers will in-line it, which
+** means that the extra parameters have no performance impact.
+*/
+static fts5YYACTIONTYPE fts5yy_reduce(
+  fts5yyParser *fts5yypParser,         /* The parser */
+  unsigned int fts5yyruleno,       /* Number of the rule by which to reduce */
+  int fts5yyLookahead,             /* Lookahead token, or fts5YYNOCODE if none */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyLookaheadToken  /* Value of the lookahead token */
+  sqlite3Fts5ParserCTX_PDECL                   /* %extra_context */
+){
+  int fts5yygoto;                     /* The next state */
+  fts5YYACTIONTYPE fts5yyact;             /* The next action */
+  fts5yyStackEntry *fts5yymsp;            /* The top of the parser's stack */
+  int fts5yysize;                     /* Amount to pop the stack */
+  sqlite3Fts5ParserARG_FETCH
+  (void)fts5yyLookahead;
+  (void)fts5yyLookaheadToken;
+  fts5yymsp = fts5yypParser->fts5yytos;
+
+  switch( fts5yyruleno ){
+  /* Beginning here are the reduction cases.  A typical example
+  ** follows:
+  **   case 0:
+  **  #line <lineno> <grammarfile>
+  **     { ... }           // User supplied code
+  **  #line <lineno> <thisfile>
+  **     break;
+  */
+/********** Begin reduce actions **********************************************/
+        fts5YYMINORTYPE fts5yylhsminor;
+      case 0: /* input ::= expr */
+#line 82 "fts5parse.y"
+{ sqlite3Fts5ParseFinished(pParse, fts5yymsp[0].minor.fts5yy24); }
+#line 1017 "fts5parse.sql"
+        break;
+      case 1: /* colset ::= MINUS LCP colsetlist RCP */
+#line 97 "fts5parse.y"
+{ 
+    fts5yymsp[-3].minor.fts5yy11 = sqlite3Fts5ParseColsetInvert(pParse, fts5yymsp[-1].minor.fts5yy11);
+}
+#line 1024 "fts5parse.sql"
+        break;
+      case 2: /* colset ::= LCP colsetlist RCP */
+#line 100 "fts5parse.y"
+{ fts5yymsp[-2].minor.fts5yy11 = fts5yymsp[-1].minor.fts5yy11; }
+#line 1029 "fts5parse.sql"
+        break;
+      case 3: /* colset ::= STRING */
+#line 101 "fts5parse.y"
+{
+  fts5yylhsminor.fts5yy11 = sqlite3Fts5ParseColset(pParse, 0, &fts5yymsp[0].minor.fts5yy0);
+}
+#line 1036 "fts5parse.sql"
+  fts5yymsp[0].minor.fts5yy11 = fts5yylhsminor.fts5yy11;
+        break;
+      case 4: /* colset ::= MINUS STRING */
+#line 104 "fts5parse.y"
+{
+  fts5yymsp[-1].minor.fts5yy11 = sqlite3Fts5ParseColset(pParse, 0, &fts5yymsp[0].minor.fts5yy0);
+  fts5yymsp[-1].minor.fts5yy11 = sqlite3Fts5ParseColsetInvert(pParse, fts5yymsp[-1].minor.fts5yy11);
+}
+#line 1045 "fts5parse.sql"
+        break;
+      case 5: /* colsetlist ::= colsetlist STRING */
+#line 109 "fts5parse.y"
+{ 
+  fts5yylhsminor.fts5yy11 = sqlite3Fts5ParseColset(pParse, fts5yymsp[-1].minor.fts5yy11, &fts5yymsp[0].minor.fts5yy0); }
+#line 1051 "fts5parse.sql"
+  fts5yymsp[-1].minor.fts5yy11 = fts5yylhsminor.fts5yy11;
+        break;
+      case 6: /* colsetlist ::= STRING */
+#line 111 "fts5parse.y"
+{ 
+  fts5yylhsminor.fts5yy11 = sqlite3Fts5ParseColset(pParse, 0, &fts5yymsp[0].minor.fts5yy0); 
+}
+#line 1059 "fts5parse.sql"
+  fts5yymsp[0].minor.fts5yy11 = fts5yylhsminor.fts5yy11;
+        break;
+      case 7: /* expr ::= expr AND expr */
+#line 115 "fts5parse.y"
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_AND, fts5yymsp[-2].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24, 0);
+}
+#line 1067 "fts5parse.sql"
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 8: /* expr ::= expr OR expr */
+#line 118 "fts5parse.y"
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_OR, fts5yymsp[-2].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24, 0);
+}
+#line 1075 "fts5parse.sql"
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 9: /* expr ::= expr NOT expr */
+#line 121 "fts5parse.y"
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_NOT, fts5yymsp[-2].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24, 0);
+}
+#line 1083 "fts5parse.sql"
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 10: /* expr ::= colset COLON LP expr RP */
+#line 125 "fts5parse.y"
+{
+  sqlite3Fts5ParseSetColset(pParse, fts5yymsp[-1].minor.fts5yy24, fts5yymsp[-4].minor.fts5yy11);
+  fts5yylhsminor.fts5yy24 = fts5yymsp[-1].minor.fts5yy24;
+}
+#line 1092 "fts5parse.sql"
+  fts5yymsp[-4].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 11: /* expr ::= LP expr RP */
+#line 129 "fts5parse.y"
+{fts5yymsp[-2].minor.fts5yy24 = fts5yymsp[-1].minor.fts5yy24;}
+#line 1098 "fts5parse.sql"
+        break;
+      case 12: /* expr ::= exprlist */
+      case 13: /* exprlist ::= cnearset */ fts5yytestcase(fts5yyruleno==13);
+#line 130 "fts5parse.y"
+{fts5yylhsminor.fts5yy24 = fts5yymsp[0].minor.fts5yy24;}
+#line 1104 "fts5parse.sql"
+  fts5yymsp[0].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 14: /* exprlist ::= exprlist cnearset */
+#line 133 "fts5parse.y"
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseImplicitAnd(pParse, fts5yymsp[-1].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24);
+}
+#line 1112 "fts5parse.sql"
+  fts5yymsp[-1].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 15: /* cnearset ::= nearset */
+#line 137 "fts5parse.y"
+{ 
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_STRING, 0, 0, fts5yymsp[0].minor.fts5yy46); 
+}
+#line 1120 "fts5parse.sql"
+  fts5yymsp[0].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 16: /* cnearset ::= colset COLON nearset */
+#line 140 "fts5parse.y"
+{ 
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_STRING, 0, 0, fts5yymsp[0].minor.fts5yy46); 
+  sqlite3Fts5ParseSetColset(pParse, fts5yylhsminor.fts5yy24, fts5yymsp[-2].minor.fts5yy11);
+}
+#line 1129 "fts5parse.sql"
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 17: /* nearset ::= phrase */
+#line 151 "fts5parse.y"
+{ fts5yylhsminor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, 0, fts5yymsp[0].minor.fts5yy53); }
+#line 1135 "fts5parse.sql"
+  fts5yymsp[0].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 18: /* nearset ::= CARET phrase */
+#line 152 "fts5parse.y"
+{ 
+  sqlite3Fts5ParseSetCaret(fts5yymsp[0].minor.fts5yy53);
+  fts5yymsp[-1].minor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, 0, fts5yymsp[0].minor.fts5yy53); 
+}
+#line 1144 "fts5parse.sql"
+        break;
+      case 19: /* nearset ::= STRING LP nearphrases neardist_opt RP */
+#line 156 "fts5parse.y"
+{
+  sqlite3Fts5ParseNear(pParse, &fts5yymsp[-4].minor.fts5yy0);
+  sqlite3Fts5ParseSetDistance(pParse, fts5yymsp[-2].minor.fts5yy46, &fts5yymsp[-1].minor.fts5yy0);
+  fts5yylhsminor.fts5yy46 = fts5yymsp[-2].minor.fts5yy46;
+}
+#line 1153 "fts5parse.sql"
+  fts5yymsp[-4].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 20: /* nearphrases ::= phrase */
+#line 162 "fts5parse.y"
+{ 
+  fts5yylhsminor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, 0, fts5yymsp[0].minor.fts5yy53); 
+}
+#line 1161 "fts5parse.sql"
+  fts5yymsp[0].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 21: /* nearphrases ::= nearphrases phrase */
+#line 165 "fts5parse.y"
+{
+  fts5yylhsminor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, fts5yymsp[-1].minor.fts5yy46, fts5yymsp[0].minor.fts5yy53);
+}
+#line 1169 "fts5parse.sql"
+  fts5yymsp[-1].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 22: /* neardist_opt ::= */
+#line 172 "fts5parse.y"
+{ fts5yymsp[1].minor.fts5yy0.p = 0; fts5yymsp[1].minor.fts5yy0.n = 0; }
+#line 1175 "fts5parse.sql"
+        break;
+      case 23: /* neardist_opt ::= COMMA STRING */
+#line 173 "fts5parse.y"
+{ fts5yymsp[-1].minor.fts5yy0 = fts5yymsp[0].minor.fts5yy0; }
+#line 1180 "fts5parse.sql"
+        break;
+      case 24: /* phrase ::= phrase PLUS STRING star_opt */
+#line 185 "fts5parse.y"
+{ 
+  fts5yylhsminor.fts5yy53 = sqlite3Fts5ParseTerm(pParse, fts5yymsp[-3].minor.fts5yy53, &fts5yymsp[-1].minor.fts5yy0, fts5yymsp[0].minor.fts5yy4);
+}
+#line 1187 "fts5parse.sql"
+  fts5yymsp[-3].minor.fts5yy53 = fts5yylhsminor.fts5yy53;
+        break;
+      case 25: /* phrase ::= STRING star_opt */
+#line 188 "fts5parse.y"
+{ 
+  fts5yylhsminor.fts5yy53 = sqlite3Fts5ParseTerm(pParse, 0, &fts5yymsp[-1].minor.fts5yy0, fts5yymsp[0].minor.fts5yy4);
+}
+#line 1195 "fts5parse.sql"
+  fts5yymsp[-1].minor.fts5yy53 = fts5yylhsminor.fts5yy53;
+        break;
+      case 26: /* star_opt ::= STAR */
+#line 196 "fts5parse.y"
+{ fts5yymsp[0].minor.fts5yy4 = 1; }
+#line 1201 "fts5parse.sql"
+        break;
+      case 27: /* star_opt ::= */
+#line 197 "fts5parse.y"
+{ fts5yymsp[1].minor.fts5yy4 = 0; }
+#line 1206 "fts5parse.sql"
+        break;
+      default:
+        break;
+/********** End reduce actions ************************************************/
+  };
+  assert( fts5yyruleno<sizeof(fts5yyRuleInfoLhs)/sizeof(fts5yyRuleInfoLhs[0]) );
+  fts5yygoto = fts5yyRuleInfoLhs[fts5yyruleno];
+  fts5yysize = fts5yyRuleInfoNRhs[fts5yyruleno];
+  fts5yyact = fts5yy_find_reduce_action(fts5yymsp[fts5yysize].stateno,(fts5YYCODETYPE)fts5yygoto);
+
+  /* There are no SHIFTREDUCE actions on nonterminals because the table
+  ** generator has simplified them to pure REDUCE actions. */
+  assert( !(fts5yyact>fts5YY_MAX_SHIFT && fts5yyact<=fts5YY_MAX_SHIFTREDUCE) );
+
+  /* It is not possible for a REDUCE to be followed by an error */
+  assert( fts5yyact!=fts5YY_ERROR_ACTION );
+
+  fts5yymsp += fts5yysize+1;
+  fts5yypParser->fts5yytos = fts5yymsp;
+  fts5yymsp->stateno = (fts5YYACTIONTYPE)fts5yyact;
+  fts5yymsp->major = (fts5YYCODETYPE)fts5yygoto;
+  fts5yyTraceShift(fts5yypParser, fts5yyact, "... then shift");
+  return fts5yyact;
+}
+
+/*
+** The following code executes when the parse fails
+*/
+#ifndef fts5YYNOERRORRECOVERY
+static void fts5yy_parse_failed(
+  fts5yyParser *fts5yypParser           /* The parser */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fprintf(fts5yyTraceFILE,"%sFail!\n",fts5yyTracePrompt);
+  }
+#endif
+  while( fts5yypParser->fts5yytos>fts5yypParser->fts5yystack ) fts5yy_pop_parser_stack(fts5yypParser);
+  /* Here code is inserted which will be executed whenever the
+  ** parser fails */
+/************ Begin %parse_failure code ***************************************/
+/************ End %parse_failure code *****************************************/
+  sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3Fts5ParserCTX_STORE
+}
+#endif /* fts5YYNOERRORRECOVERY */
+
+/*
+** The following code executes when a syntax error first occurs.
+*/
+static void fts5yy_syntax_error(
+  fts5yyParser *fts5yypParser,           /* The parser */
+  int fts5yymajor,                   /* The major type of the error token */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyminor         /* The minor type of the error token */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+#define FTS5TOKEN fts5yyminor
+/************ Begin %syntax_error code ****************************************/
+#line 30 "fts5parse.y"
+
+  UNUSED_PARAM(fts5yymajor); /* Silence a compiler warning */
+  sqlite3Fts5ParseError(
+    pParse, "fts5: syntax error near \"%.*s\"",FTS5TOKEN.n,FTS5TOKEN.p
+  );
+#line 1274 "fts5parse.sql"
+/************ End %syntax_error code ******************************************/
+  sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3Fts5ParserCTX_STORE
+}
+
+/*
+** The following is executed when the parser accepts
+*/
+static void fts5yy_accept(
+  fts5yyParser *fts5yypParser           /* The parser */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fprintf(fts5yyTraceFILE,"%sAccept!\n",fts5yyTracePrompt);
+  }
+#endif
+#ifndef fts5YYNOERRORRECOVERY
+  fts5yypParser->fts5yyerrcnt = -1;
+#endif
+  assert( fts5yypParser->fts5yytos==fts5yypParser->fts5yystack );
+  /* Here code is inserted which will be executed whenever the
+  ** parser accepts */
+/*********** Begin %parse_accept code *****************************************/
+/*********** End %parse_accept code *******************************************/
+  sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3Fts5ParserCTX_STORE
+}
+
+/* The main parser program.
+** The first argument is a pointer to a structure obtained from
+** "sqlite3Fts5ParserAlloc" which describes the current state of the parser.
+** The second argument is the major token number.  The third is
+** the minor token.  The fourth optional argument is whatever the
+** user wants (and specified in the grammar) and is available for
+** use by the action routines.
+**
+** Inputs:
+** <ul>
+** <li> A pointer to the parser (an opaque structure.)
+** <li> The major token number.
+** <li> The minor token number.
+** <li> An option argument of a grammar-specified type.
+** </ul>
+**
+** Outputs:
+** None.
+*/
+static void sqlite3Fts5Parser(
+  void *fts5yyp,                   /* The parser */
+  int fts5yymajor,                 /* The major token code number */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyminor       /* The value for the token */
+  sqlite3Fts5ParserARG_PDECL               /* Optional %extra_argument parameter */
+){
+  fts5YYMINORTYPE fts5yyminorunion;
+  fts5YYACTIONTYPE fts5yyact;   /* The parser action. */
+#if !defined(fts5YYERRORSYMBOL) && !defined(fts5YYNOERRORRECOVERY)
+  int fts5yyendofinput;     /* True if we are at the end of input */
+#endif
+#ifdef fts5YYERRORSYMBOL
+  int fts5yyerrorhit = 0;   /* True if fts5yymajor has invoked an error */
+#endif
+  fts5yyParser *fts5yypParser = (fts5yyParser*)fts5yyp;  /* The parser */
+  sqlite3Fts5ParserCTX_FETCH
+  sqlite3Fts5ParserARG_STORE
+
+  assert( fts5yypParser->fts5yytos!=0 );
+#if !defined(fts5YYERRORSYMBOL) && !defined(fts5YYNOERRORRECOVERY)
+  fts5yyendofinput = (fts5yymajor==0);
+#endif
+
+  fts5yyact = fts5yypParser->fts5yytos->stateno;
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    if( fts5yyact < fts5YY_MIN_REDUCE ){
+      fprintf(fts5yyTraceFILE,"%sInput '%s' in state %d\n",
+              fts5yyTracePrompt,fts5yyTokenName[fts5yymajor],fts5yyact);
+    }else{
+      fprintf(fts5yyTraceFILE,"%sInput '%s' with pending reduce %d\n",
+              fts5yyTracePrompt,fts5yyTokenName[fts5yymajor],fts5yyact-fts5YY_MIN_REDUCE);
+    }
+  }
+#endif
+
+  while(1){ /* Exit by "break" */
+    assert( fts5yypParser->fts5yytos>=fts5yypParser->fts5yystack );
+    assert( fts5yyact==fts5yypParser->fts5yytos->stateno );
+    fts5yyact = fts5yy_find_shift_action((fts5YYCODETYPE)fts5yymajor,fts5yyact);
+    if( fts5yyact >= fts5YY_MIN_REDUCE ){
+      unsigned int fts5yyruleno = fts5yyact - fts5YY_MIN_REDUCE; /* Reduce by this rule */
+#ifndef NDEBUG
+      assert( fts5yyruleno<(int)(sizeof(fts5yyRuleName)/sizeof(fts5yyRuleName[0])) );
+      if( fts5yyTraceFILE ){
+        int fts5yysize = fts5yyRuleInfoNRhs[fts5yyruleno];
+        if( fts5yysize ){
+          fprintf(fts5yyTraceFILE, "%sReduce %d [%s]%s, pop back to state %d.\n",
+            fts5yyTracePrompt,
+            fts5yyruleno, fts5yyRuleName[fts5yyruleno],
+            fts5yyruleno<fts5YYNRULE_WITH_ACTION ? "" : " without external action",
+            fts5yypParser->fts5yytos[fts5yysize].stateno);
+        }else{
+          fprintf(fts5yyTraceFILE, "%sReduce %d [%s]%s.\n",
+            fts5yyTracePrompt, fts5yyruleno, fts5yyRuleName[fts5yyruleno],
+            fts5yyruleno<fts5YYNRULE_WITH_ACTION ? "" : " without external action");
+        }
+      }
+#endif /* NDEBUG */
+
+      /* Check that the stack is large enough to grow by a single entry
+      ** if the RHS of the rule is empty.  This ensures that there is room
+      ** enough on the stack to push the LHS value */
+      if( fts5yyRuleInfoNRhs[fts5yyruleno]==0 ){
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+        if( (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack)>fts5yypParser->fts5yyhwm ){
+          fts5yypParser->fts5yyhwm++;
+          assert( fts5yypParser->fts5yyhwm ==
+                  (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack));
+        }
+#endif
+#if fts5YYSTACKDEPTH>0 
+        if( fts5yypParser->fts5yytos>=fts5yypParser->fts5yystackEnd ){
+          fts5yyStackOverflow(fts5yypParser);
+          break;
+        }
+#else
+        if( fts5yypParser->fts5yytos>=&fts5yypParser->fts5yystack[fts5yypParser->fts5yystksz-1] ){
+          if( fts5yyGrowStack(fts5yypParser) ){
+            fts5yyStackOverflow(fts5yypParser);
+            break;
+          }
+        }
+#endif
+      }
+      fts5yyact = fts5yy_reduce(fts5yypParser,fts5yyruleno,fts5yymajor,fts5yyminor sqlite3Fts5ParserCTX_PARAM);
+    }else if( fts5yyact <= fts5YY_MAX_SHIFTREDUCE ){
+      fts5yy_shift(fts5yypParser,fts5yyact,(fts5YYCODETYPE)fts5yymajor,fts5yyminor);
+#ifndef fts5YYNOERRORRECOVERY
+      fts5yypParser->fts5yyerrcnt--;
+#endif
+      break;
+    }else if( fts5yyact==fts5YY_ACCEPT_ACTION ){
+      fts5yypParser->fts5yytos--;
+      fts5yy_accept(fts5yypParser);
+      return;
+    }else{
+      assert( fts5yyact == fts5YY_ERROR_ACTION );
+      fts5yyminorunion.fts5yy0 = fts5yyminor;
+#ifdef fts5YYERRORSYMBOL
+      int fts5yymx;
+#endif
+#ifndef NDEBUG
+      if( fts5yyTraceFILE ){
+        fprintf(fts5yyTraceFILE,"%sSyntax Error!\n",fts5yyTracePrompt);
+      }
+#endif
+#ifdef fts5YYERRORSYMBOL
+      /* A syntax error has occurred.
+      ** The response to an error depends upon whether or not the
+      ** grammar defines an error token "ERROR".  
+      **
+      ** This is what we do if the grammar does define ERROR:
+      **
+      **  * Call the %syntax_error function.
+      **
+      **  * Begin popping the stack until we enter a state where
+      **    it is legal to shift the error symbol, then shift
+      **    the error symbol.
+      **
+      **  * Set the error count to three.
+      **
+      **  * Begin accepting and shifting new tokens.  No new error
+      **    processing will occur until three tokens have been
+      **    shifted successfully.
+      **
+      */
+      if( fts5yypParser->fts5yyerrcnt<0 ){
+        fts5yy_syntax_error(fts5yypParser,fts5yymajor,fts5yyminor);
+      }
+      fts5yymx = fts5yypParser->fts5yytos->major;
+      if( fts5yymx==fts5YYERRORSYMBOL || fts5yyerrorhit ){
+#ifndef NDEBUG
+        if( fts5yyTraceFILE ){
+          fprintf(fts5yyTraceFILE,"%sDiscard input token %s\n",
+             fts5yyTracePrompt,fts5yyTokenName[fts5yymajor]);
+        }
+#endif
+        fts5yy_destructor(fts5yypParser, (fts5YYCODETYPE)fts5yymajor, &fts5yyminorunion);
+        fts5yymajor = fts5YYNOCODE;
+      }else{
+        while( fts5yypParser->fts5yytos > fts5yypParser->fts5yystack ){
+          fts5yyact = fts5yy_find_reduce_action(fts5yypParser->fts5yytos->stateno,
+                                        fts5YYERRORSYMBOL);
+          if( fts5yyact<=fts5YY_MAX_SHIFTREDUCE ) break;
+          fts5yy_pop_parser_stack(fts5yypParser);
+        }
+        if( fts5yypParser->fts5yytos <= fts5yypParser->fts5yystack || fts5yymajor==0 ){
+          fts5yy_destructor(fts5yypParser,(fts5YYCODETYPE)fts5yymajor,&fts5yyminorunion);
+          fts5yy_parse_failed(fts5yypParser);
+#ifndef fts5YYNOERRORRECOVERY
+          fts5yypParser->fts5yyerrcnt = -1;
+#endif
+          fts5yymajor = fts5YYNOCODE;
+        }else if( fts5yymx!=fts5YYERRORSYMBOL ){
+          fts5yy_shift(fts5yypParser,fts5yyact,fts5YYERRORSYMBOL,fts5yyminor);
+        }
+      }
+      fts5yypParser->fts5yyerrcnt = 3;
+      fts5yyerrorhit = 1;
+      if( fts5yymajor==fts5YYNOCODE ) break;
+      fts5yyact = fts5yypParser->fts5yytos->stateno;
+#elif defined(fts5YYNOERRORRECOVERY)
+      /* If the fts5YYNOERRORRECOVERY macro is defined, then do not attempt to
+      ** do any kind of error recovery.  Instead, simply invoke the syntax
+      ** error routine and continue going as if nothing had happened.
+      **
+      ** Applications can set this macro (for example inside %include) if
+      ** they intend to abandon the parse upon the first syntax error seen.
+      */
+      fts5yy_syntax_error(fts5yypParser,fts5yymajor, fts5yyminor);
+      fts5yy_destructor(fts5yypParser,(fts5YYCODETYPE)fts5yymajor,&fts5yyminorunion);
+      break;
+#else  /* fts5YYERRORSYMBOL is not defined */
+      /* This is what we do if the grammar does not define ERROR:
+      **
+      **  * Report an error message, and throw away the input token.
+      **
+      **  * If the input token is $, then fail the parse.
+      **
+      ** As before, subsequent error messages are suppressed until
+      ** three input tokens have been successfully shifted.
+      */
+      if( fts5yypParser->fts5yyerrcnt<=0 ){
+        fts5yy_syntax_error(fts5yypParser,fts5yymajor, fts5yyminor);
+      }
+      fts5yypParser->fts5yyerrcnt = 3;
+      fts5yy_destructor(fts5yypParser,(fts5YYCODETYPE)fts5yymajor,&fts5yyminorunion);
+      if( fts5yyendofinput ){
+        fts5yy_parse_failed(fts5yypParser);
+#ifndef fts5YYNOERRORRECOVERY
+        fts5yypParser->fts5yyerrcnt = -1;
+#endif
+      }
+      break;
+#endif
+    }
+  }
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fts5yyStackEntry *i;
+    char cDiv = '[';
+    fprintf(fts5yyTraceFILE,"%sReturn. Stack=",fts5yyTracePrompt);
+    for(i=&fts5yypParser->fts5yystack[1]; i<=fts5yypParser->fts5yytos; i++){
+      fprintf(fts5yyTraceFILE,"%c%s", cDiv, fts5yyTokenName[i->major]);
+      cDiv = ' ';
+    }
+    fprintf(fts5yyTraceFILE,"]\n");
+  }
+#endif
+  return;
+}
+
+/*
+** Return the fallback token corresponding to canonical token iToken, or
+** 0 if iToken has no fallback.
+*/
+static int sqlite3Fts5ParserFallback(int iToken){
+#ifdef fts5YYFALLBACK
+  assert( iToken<(int)(sizeof(fts5yyFallback)/sizeof(fts5yyFallback[0])) );
+  return fts5yyFallback[iToken];
+#else
+  (void)iToken;
+  return 0;
+#endif
+}
+
+#line 1 "fts5_aux.c"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+
+/* #include "fts5Int.h" */
+#include <math.h>                 /* amalgamator: keep */
+
+/*
+** Object used to iterate through all "coalesced phrase instances" in 
+** a single column of the current row. If the phrase instances in the
+** column being considered do not overlap, this object simply iterates
+** through them. Or, if they do overlap (share one or more tokens in
+** common), each set of overlapping instances is treated as a single
+** match. See documentation for the highlight() auxiliary function for
+** details.
+**
+** Usage is:
+**
+**   for(rc = fts5CInstIterNext(pApi, pFts, iCol, &iter);
+**      (rc==SQLITE_OK && 0==fts5CInstIterEof(&iter);
+**      rc = fts5CInstIterNext(&iter)
+**   ){
+**     printf("instance starts at %d, ends at %d\n", iter.iStart, iter.iEnd);
+**   }
+**
+*/
+typedef struct CInstIter CInstIter;
+struct CInstIter {
+  const Fts5ExtensionApi *pApi;   /* API offered by current FTS version */
+  Fts5Context *pFts;              /* First arg to pass to pApi functions */
+  int iCol;                       /* Column to search */
+  int iInst;                      /* Next phrase instance index */
+  int nInst;                      /* Total number of phrase instances */
+
+  /* Output variables */
+  int iStart;                     /* First token in coalesced phrase instance */
+  int iEnd;                       /* Last token in coalesced phrase instance */
+};
+
+/*
+** Advance the iterator to the next coalesced phrase instance. Return
+** an SQLite error code if an error occurs, or SQLITE_OK otherwise.
+*/
+static int fts5CInstIterNext(CInstIter *pIter){
+  int rc = SQLITE_OK;
+  pIter->iStart = -1;
+  pIter->iEnd = -1;
+
+  while( rc==SQLITE_OK && pIter->iInst<pIter->nInst ){
+    int ip; int ic; int io;
+    rc = pIter->pApi->xInst(pIter->pFts, pIter->iInst, &ip, &ic, &io);
+    if( rc==SQLITE_OK ){
+      if( ic==pIter->iCol ){
+        int iEnd = io - 1 + pIter->pApi->xPhraseSize(pIter->pFts, ip);
+        if( pIter->iStart<0 ){
+          pIter->iStart = io;
+          pIter->iEnd = iEnd;
+        }else if( io<=pIter->iEnd ){
+          if( iEnd>pIter->iEnd ) pIter->iEnd = iEnd;
+        }else{
+          break;
+        }
+      }
+      pIter->iInst++;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Initialize the iterator object indicated by the final parameter to 
+** iterate through coalesced phrase instances in column iCol.
+*/
+static int fts5CInstIterInit(
+  const Fts5ExtensionApi *pApi,
+  Fts5Context *pFts,
+  int iCol,
+  CInstIter *pIter
+){
+  int rc;
+
+  memset(pIter, 0, sizeof(CInstIter));
+  pIter->pApi = pApi;
+  pIter->pFts = pFts;
+  pIter->iCol = iCol;
+  rc = pApi->xInstCount(pFts, &pIter->nInst);
+
+  if( rc==SQLITE_OK ){
+    rc = fts5CInstIterNext(pIter);
+  }
+
+  return rc;
+}
+
+
+
+/*************************************************************************
+** Start of highlight() implementation.
+*/
+typedef struct HighlightContext HighlightContext;
+struct HighlightContext {
+  /* Constant parameters to fts5HighlightCb() */
+  int iRangeStart;                /* First token to include */
+  int iRangeEnd;                  /* If non-zero, last token to include */
+  const char *zOpen;              /* Opening highlight */
+  const char *zClose;             /* Closing highlight */
+  const char *zIn;                /* Input text */
+  int nIn;                        /* Size of input text in bytes */
+
+  /* Variables modified by fts5HighlightCb() */
+  CInstIter iter;                 /* Coalesced Instance Iterator */
+  int iPos;                       /* Current token offset in zIn[] */
+  int iOff;                       /* Have copied up to this offset in zIn[] */
+  int bOpen;                      /* True if highlight is open */
+  char *zOut;                     /* Output value */
+};
+
+/*
+** Append text to the HighlightContext output string - p->zOut. Argument
+** z points to a buffer containing n bytes of text to append. If n is 
+** negative, everything up until the first '\0' is appended to the output.
+**
+** If *pRc is set to any value other than SQLITE_OK when this function is 
+** called, it is a no-op. If an error (i.e. an OOM condition) is encountered, 
+** *pRc is set to an error code before returning. 
+*/
+static void fts5HighlightAppend(
+  int *pRc, 
+  HighlightContext *p, 
+  const char *z, int n
+){
+  if( *pRc==SQLITE_OK && z ){
+    if( n<0 ) n = (int)strlen(z);
+    p->zOut = sqlite3_mprintf("%z%.*s", p->zOut, n, z);
+    if( p->zOut==0 ) *pRc = SQLITE_NOMEM;
+  }
+}
+
+/*
+** Tokenizer callback used by implementation of highlight() function.
+*/
+static int fts5HighlightCb(
+  void *pContext,                 /* Pointer to HighlightContext object */
+  int tflags,                     /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iStartOff,                  /* Start byte offset of token */
+  int iEndOff                     /* End byte offset of token */
+){
+  HighlightContext *p = (HighlightContext*)pContext;
+  int rc = SQLITE_OK;
+  int iPos;
+
+  UNUSED_PARAM2(pToken, nToken);
+
+  if( tflags & FTS5_TOKEN_COLOCATED ) return SQLITE_OK;
+  iPos = p->iPos++;
+
+  if( p->iRangeEnd>=0 ){
+    if( iPos<p->iRangeStart || iPos>p->iRangeEnd ) return SQLITE_OK;
+    if( p->iRangeStart && iPos==p->iRangeStart ) p->iOff = iStartOff;
+  }
+
+  /* If the parenthesis is open, and this token is not part of the current
+  ** phrase, and the starting byte offset of this token is past the point
+  ** that has currently been copied into the output buffer, close the
+  ** parenthesis. */
+  if( p->bOpen 
+   && (iPos<=p->iter.iStart || p->iter.iStart<0)
+   && iStartOff>p->iOff 
+  ){
+    fts5HighlightAppend(&rc, p, p->zClose, -1);
+    p->bOpen = 0;
+  }
+
+  /* If this is the start of a new phrase, and the highlight is not open:
+  **
+  **   * copy text from the input up to the start of the phrase, and
+  **   * open the highlight.
+  */
+  if( iPos==p->iter.iStart && p->bOpen==0 ){
+    fts5HighlightAppend(&rc, p, &p->zIn[p->iOff], iStartOff - p->iOff);
+    fts5HighlightAppend(&rc, p, p->zOpen, -1);
+    p->iOff = iStartOff;
+    p->bOpen = 1;
+  }
+
+  if( iPos==p->iter.iEnd ){
+    if( p->bOpen==0 ){
+      assert( p->iRangeEnd>=0 );
+      fts5HighlightAppend(&rc, p, p->zOpen, -1);
+      p->bOpen = 1;
+    }
+    fts5HighlightAppend(&rc, p, &p->zIn[p->iOff], iEndOff - p->iOff);
+    p->iOff = iEndOff;
+
+    if( rc==SQLITE_OK ){
+      rc = fts5CInstIterNext(&p->iter);
+    }
+  }
+
+  if( iPos==p->iRangeEnd ){
+    if( p->bOpen ){
+      if( p->iter.iStart>=0 && iPos>=p->iter.iStart ){
+        fts5HighlightAppend(&rc, p, &p->zIn[p->iOff], iEndOff - p->iOff);
+        p->iOff = iEndOff;
+      }
+      fts5HighlightAppend(&rc, p, p->zClose, -1);
+      p->bOpen = 0;
+    }
+    fts5HighlightAppend(&rc, p, &p->zIn[p->iOff], iEndOff - p->iOff);
+    p->iOff = iEndOff;
+  }
+
+  return rc;
+}
+
+/*
+** Implementation of highlight() function.
+*/
+static void fts5HighlightFunction(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+){
+  HighlightContext ctx;
+  int rc;
+  int iCol;
+
+  if( nVal!=3 ){
+    const char *zErr = "wrong number of arguments to function highlight()";
+    sqlite3_result_error(pCtx, zErr, -1);
+    return;
+  }
+
+  iCol = sqlite3_value_int(apVal[0]);
+  memset(&ctx, 0, sizeof(HighlightContext));
+  ctx.zOpen = (const char*)sqlite3_value_text(apVal[1]);
+  ctx.zClose = (const char*)sqlite3_value_text(apVal[2]);
+  ctx.iRangeEnd = -1;
+  rc = pApi->xColumnText(pFts, iCol, &ctx.zIn, &ctx.nIn);
+  if( rc==SQLITE_RANGE ){
+    sqlite3_result_text(pCtx, "", -1, SQLITE_STATIC);
+    rc = SQLITE_OK;
+  }else if( ctx.zIn ){
+    if( rc==SQLITE_OK ){
+      rc = fts5CInstIterInit(pApi, pFts, iCol, &ctx.iter);
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = pApi->xTokenize(pFts, ctx.zIn, ctx.nIn, (void*)&ctx,fts5HighlightCb);
+    }
+    if( ctx.bOpen ){
+      fts5HighlightAppend(&rc, &ctx, ctx.zClose, -1);
+    }
+    fts5HighlightAppend(&rc, &ctx, &ctx.zIn[ctx.iOff], ctx.nIn - ctx.iOff);
+
+    if( rc==SQLITE_OK ){
+      sqlite3_result_text(pCtx, (const char*)ctx.zOut, -1, SQLITE_TRANSIENT);
+    }
+    sqlite3_free(ctx.zOut);
+  }
+  if( rc!=SQLITE_OK ){
+    sqlite3_result_error_code(pCtx, rc);
+  }
+}
+/*
+** End of highlight() implementation.
+**************************************************************************/
+
+/*
+** Context object passed to the fts5SentenceFinderCb() function.
+*/
+typedef struct Fts5SFinder Fts5SFinder;
+struct Fts5SFinder {
+  int iPos;                       /* Current token position */
+  int nFirstAlloc;                /* Allocated size of aFirst[] */
+  int nFirst;                     /* Number of entries in aFirst[] */
+  int *aFirst;                    /* Array of first token in each sentence */
+  const char *zDoc;               /* Document being tokenized */
+};
+
+/*
+** Add an entry to the Fts5SFinder.aFirst[] array. Grow the array if
+** necessary. Return SQLITE_OK if successful, or SQLITE_NOMEM if an
+** error occurs.
+*/
+static int fts5SentenceFinderAdd(Fts5SFinder *p, int iAdd){
+  if( p->nFirstAlloc==p->nFirst ){
+    int nNew = p->nFirstAlloc ? p->nFirstAlloc*2 : 64;
+    int *aNew;
+
+    aNew = (int*)sqlite3_realloc64(p->aFirst, nNew*sizeof(int));
+    if( aNew==0 ) return SQLITE_NOMEM;
+    p->aFirst = aNew;
+    p->nFirstAlloc = nNew;
+  }
+  p->aFirst[p->nFirst++] = iAdd;
+  return SQLITE_OK;
+}
+
+/*
+** This function is an xTokenize() callback used by the auxiliary snippet()
+** function. Its job is to identify tokens that are the first in a sentence.
+** For each such token, an entry is added to the SFinder.aFirst[] array.
+*/
+static int fts5SentenceFinderCb(
+  void *pContext,                 /* Pointer to HighlightContext object */
+  int tflags,                     /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iStartOff,                  /* Start offset of token */
+  int iEndOff                     /* End offset of token */
+){
+  int rc = SQLITE_OK;
+
+  UNUSED_PARAM2(pToken, nToken);
+  UNUSED_PARAM(iEndOff);
+
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 ){
+    Fts5SFinder *p = (Fts5SFinder*)pContext;
+    if( p->iPos>0 ){
+      int i;
+      char c = 0;
+      for(i=iStartOff-1; i>=0; i--){
+        c = p->zDoc[i];
+        if( c!=' ' && c!='\t' && c!='\n' && c!='\r' ) break;
+      }
+      if( i!=iStartOff-1 && (c=='.' || c==':') ){
+        rc = fts5SentenceFinderAdd(p, p->iPos);
+      }
+    }else{
+      rc = fts5SentenceFinderAdd(p, 0);
+    }
+    p->iPos++;
+  }
+  return rc;
+}
+
+static int fts5SnippetScore(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  int nDocsize,                   /* Size of column in tokens */
+  unsigned char *aSeen,           /* Array with one element per query phrase */
+  int iCol,                       /* Column to score */
+  int iPos,                       /* Starting offset to score */
+  int nToken,                     /* Max tokens per snippet */
+  int *pnScore,                   /* OUT: Score */
+  int *piPos                      /* OUT: Adjusted offset */
+){
+  int rc;
+  int i;
+  int ip = 0;
+  int ic = 0;
+  int iOff = 0;
+  int iFirst = -1;
+  int nInst;
+  int nScore = 0;
+  int iLast = 0;
+  sqlite3_int64 iEnd = (sqlite3_int64)iPos + nToken;
+
+  rc = pApi->xInstCount(pFts, &nInst);
+  for(i=0; i<nInst && rc==SQLITE_OK; i++){
+    rc = pApi->xInst(pFts, i, &ip, &ic, &iOff);
+    if( rc==SQLITE_OK && ic==iCol && iOff>=iPos && iOff<iEnd ){
+      nScore += (aSeen[ip] ? 1 : 1000);
+      aSeen[ip] = 1;
+      if( iFirst<0 ) iFirst = iOff;
+      iLast = iOff + pApi->xPhraseSize(pFts, ip);
+    }
+  }
+
+  *pnScore = nScore;
+  if( piPos ){
+    sqlite3_int64 iAdj = iFirst - (nToken - (iLast-iFirst)) / 2;
+    if( (iAdj+nToken)>nDocsize ) iAdj = nDocsize - nToken;
+    if( iAdj<0 ) iAdj = 0;
+    *piPos = (int)iAdj;
+  }
+
+  return rc;
+}
+
+/*
+** Return the value in pVal interpreted as utf-8 text. Except, if pVal 
+** contains a NULL value, return a pointer to a static string zero
+** bytes in length instead of a NULL pointer.
+*/
+static const char *fts5ValueToText(sqlite3_value *pVal){
+  const char *zRet = (const char*)sqlite3_value_text(pVal);
+  return zRet ? zRet : "";
+}
+
+/*
+** Implementation of snippet() function.
+*/
+static void fts5SnippetFunction(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+){
+  HighlightContext ctx;
+  int rc = SQLITE_OK;             /* Return code */
+  int iCol;                       /* 1st argument to snippet() */
+  const char *zEllips;            /* 4th argument to snippet() */
+  int nToken;                     /* 5th argument to snippet() */
+  int nInst = 0;                  /* Number of instance matches this row */
+  int i;                          /* Used to iterate through instances */
+  int nPhrase;                    /* Number of phrases in query */
+  unsigned char *aSeen;           /* Array of "seen instance" flags */
+  int iBestCol;                   /* Column containing best snippet */
+  int iBestStart = 0;             /* First token of best snippet */
+  int nBestScore = 0;             /* Score of best snippet */
+  int nColSize = 0;               /* Total size of iBestCol in tokens */
+  Fts5SFinder sFinder;            /* Used to find the beginnings of sentences */
+  int nCol;
+
+  if( nVal!=5 ){
+    const char *zErr = "wrong number of arguments to function snippet()";
+    sqlite3_result_error(pCtx, zErr, -1);
+    return;
+  }
+
+  nCol = pApi->xColumnCount(pFts);
+  memset(&ctx, 0, sizeof(HighlightContext));
+  iCol = sqlite3_value_int(apVal[0]);
+  ctx.zOpen = fts5ValueToText(apVal[1]);
+  ctx.zClose = fts5ValueToText(apVal[2]);
+  ctx.iRangeEnd = -1;
+  zEllips = fts5ValueToText(apVal[3]);
+  nToken = sqlite3_value_int(apVal[4]);
+
+  iBestCol = (iCol>=0 ? iCol : 0);
+  nPhrase = pApi->xPhraseCount(pFts);
+  aSeen = sqlite3_malloc(nPhrase);
+  if( aSeen==0 ){
+    rc = SQLITE_NOMEM;
+  }
+  if( rc==SQLITE_OK ){
+    rc = pApi->xInstCount(pFts, &nInst);
+  }
+
+  memset(&sFinder, 0, sizeof(Fts5SFinder));
+  for(i=0; i<nCol; i++){
+    if( iCol<0 || iCol==i ){
+      int nDoc;
+      int nDocsize;
+      int ii;
+      sFinder.iPos = 0;
+      sFinder.nFirst = 0;
+      rc = pApi->xColumnText(pFts, i, &sFinder.zDoc, &nDoc);
+      if( rc!=SQLITE_OK ) break;
+      rc = pApi->xTokenize(pFts, 
+          sFinder.zDoc, nDoc, (void*)&sFinder,fts5SentenceFinderCb
+      );
+      if( rc!=SQLITE_OK ) break;
+      rc = pApi->xColumnSize(pFts, i, &nDocsize);
+      if( rc!=SQLITE_OK ) break;
+
+      for(ii=0; rc==SQLITE_OK && ii<nInst; ii++){
+        int ip, ic, io;
+        int iAdj;
+        int nScore;
+        int jj;
+
+        rc = pApi->xInst(pFts, ii, &ip, &ic, &io);
+        if( ic!=i ) continue;
+        if( io>nDocsize ) rc = FTS5_CORRUPT;
+        if( rc!=SQLITE_OK ) continue;
+        memset(aSeen, 0, nPhrase);
+        rc = fts5SnippetScore(pApi, pFts, nDocsize, aSeen, i,
+            io, nToken, &nScore, &iAdj
+        );
+        if( rc==SQLITE_OK && nScore>nBestScore ){
+          nBestScore = nScore;
+          iBestCol = i;
+          iBestStart = iAdj;
+          nColSize = nDocsize;
+        }
+
+        if( rc==SQLITE_OK && sFinder.nFirst && nDocsize>nToken ){
+          for(jj=0; jj<(sFinder.nFirst-1); jj++){
+            if( sFinder.aFirst[jj+1]>io ) break;
+          }
+
+          if( sFinder.aFirst[jj]<io ){
+            memset(aSeen, 0, nPhrase);
+            rc = fts5SnippetScore(pApi, pFts, nDocsize, aSeen, i, 
+              sFinder.aFirst[jj], nToken, &nScore, 0
+            );
+
+            nScore += (sFinder.aFirst[jj]==0 ? 120 : 100);
+            if( rc==SQLITE_OK && nScore>nBestScore ){
+              nBestScore = nScore;
+              iBestCol = i;
+              iBestStart = sFinder.aFirst[jj];
+              nColSize = nDocsize;
+            }
+          }
+        }
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = pApi->xColumnText(pFts, iBestCol, &ctx.zIn, &ctx.nIn);
+  }
+  if( rc==SQLITE_OK && nColSize==0 ){
+    rc = pApi->xColumnSize(pFts, iBestCol, &nColSize);
+  }
+  if( ctx.zIn ){
+    if( rc==SQLITE_OK ){
+      rc = fts5CInstIterInit(pApi, pFts, iBestCol, &ctx.iter);
+    }
+
+    ctx.iRangeStart = iBestStart;
+    ctx.iRangeEnd = iBestStart + nToken - 1;
+
+    if( iBestStart>0 ){
+      fts5HighlightAppend(&rc, &ctx, zEllips, -1);
+    }
+
+    /* Advance iterator ctx.iter so that it points to the first coalesced
+    ** phrase instance at or following position iBestStart. */
+    while( ctx.iter.iStart>=0 && ctx.iter.iStart<iBestStart && rc==SQLITE_OK ){
+      rc = fts5CInstIterNext(&ctx.iter);
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = pApi->xTokenize(pFts, ctx.zIn, ctx.nIn, (void*)&ctx,fts5HighlightCb);
+    }
+    if( ctx.bOpen ){
+      fts5HighlightAppend(&rc, &ctx, ctx.zClose, -1);
+    }
+    if( ctx.iRangeEnd>=(nColSize-1) ){
+      fts5HighlightAppend(&rc, &ctx, &ctx.zIn[ctx.iOff], ctx.nIn - ctx.iOff);
+    }else{
+      fts5HighlightAppend(&rc, &ctx, zEllips, -1);
+    }
+  }
+  if( rc==SQLITE_OK ){
+    sqlite3_result_text(pCtx, (const char*)ctx.zOut, -1, SQLITE_TRANSIENT);
+  }else{
+    sqlite3_result_error_code(pCtx, rc);
+  }
+  sqlite3_free(ctx.zOut);
+  sqlite3_free(aSeen);
+  sqlite3_free(sFinder.aFirst);
+}
+
+/************************************************************************/
+
+/*
+** The first time the bm25() function is called for a query, an instance
+** of the following structure is allocated and populated.
+*/
+typedef struct Fts5Bm25Data Fts5Bm25Data;
+struct Fts5Bm25Data {
+  int nPhrase;                    /* Number of phrases in query */
+  double avgdl;                   /* Average number of tokens in each row */
+  double *aIDF;                   /* IDF for each phrase */
+  double *aFreq;                  /* Array used to calculate phrase freq. */
+};
+
+/*
+** Callback used by fts5Bm25GetData() to count the number of rows in the
+** table matched by each individual phrase within the query.
+*/
+static int fts5CountCb(
+  const Fts5ExtensionApi *pApi, 
+  Fts5Context *pFts,
+  void *pUserData                 /* Pointer to sqlite3_int64 variable */
+){
+  sqlite3_int64 *pn = (sqlite3_int64*)pUserData;
+  UNUSED_PARAM2(pApi, pFts);
+  (*pn)++;
+  return SQLITE_OK;
+}
+
+/*
+** Set *ppData to point to the Fts5Bm25Data object for the current query. 
+** If the object has not already been allocated, allocate and populate it
+** now.
+*/
+static int fts5Bm25GetData(
+  const Fts5ExtensionApi *pApi, 
+  Fts5Context *pFts,
+  Fts5Bm25Data **ppData           /* OUT: bm25-data object for this query */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Bm25Data *p;                /* Object to return */
+
+  p = (Fts5Bm25Data*)pApi->xGetAuxdata(pFts, 0);
+  if( p==0 ){
+    int nPhrase;                  /* Number of phrases in query */
+    sqlite3_int64 nRow = 0;       /* Number of rows in table */
+    sqlite3_int64 nToken = 0;     /* Number of tokens in table */
+    sqlite3_int64 nByte;          /* Bytes of space to allocate */
+    int i;
+
+    /* Allocate the Fts5Bm25Data object */
+    nPhrase = pApi->xPhraseCount(pFts);
+    nByte = sizeof(Fts5Bm25Data) + nPhrase*2*sizeof(double);
+    p = (Fts5Bm25Data*)sqlite3_malloc64(nByte);
+    if( p==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(p, 0, (size_t)nByte);
+      p->nPhrase = nPhrase;
+      p->aIDF = (double*)&p[1];
+      p->aFreq = &p->aIDF[nPhrase];
+    }
+
+    /* Calculate the average document length for this FTS5 table */
+    if( rc==SQLITE_OK ) rc = pApi->xRowCount(pFts, &nRow);
+    assert( rc!=SQLITE_OK || nRow>0 );
+    if( rc==SQLITE_OK ) rc = pApi->xColumnTotalSize(pFts, -1, &nToken);
+    if( rc==SQLITE_OK ) p->avgdl = (double)nToken  / (double)nRow;
+
+    /* Calculate an IDF for each phrase in the query */
+    for(i=0; rc==SQLITE_OK && i<nPhrase; i++){
+      sqlite3_int64 nHit = 0;
+      rc = pApi->xQueryPhrase(pFts, i, (void*)&nHit, fts5CountCb);
+      if( rc==SQLITE_OK ){
+        /* Calculate the IDF (Inverse Document Frequency) for phrase i.
+        ** This is done using the standard BM25 formula as found on wikipedia:
+        **
+        **   IDF = log( (N - nHit + 0.5) / (nHit + 0.5) )
+        **
+        ** where "N" is the total number of documents in the set and nHit
+        ** is the number that contain at least one instance of the phrase
+        ** under consideration.
+        **
+        ** The problem with this is that if (N < 2*nHit), the IDF is 
+        ** negative. Which is undesirable. So the mimimum allowable IDF is
+        ** (1e-6) - roughly the same as a term that appears in just over
+        ** half of set of 5,000,000 documents.  */
+        double idf = log( (nRow - nHit + 0.5) / (nHit + 0.5) );
+        if( idf<=0.0 ) idf = 1e-6;
+        p->aIDF[i] = idf;
+      }
+    }
+
+    if( rc!=SQLITE_OK ){
+      sqlite3_free(p);
+    }else{
+      rc = pApi->xSetAuxdata(pFts, p, sqlite3_free);
+    }
+    if( rc!=SQLITE_OK ) p = 0;
+  }
+  *ppData = p;
+  return rc;
+}
+
+/*
+** Implementation of bm25() function.
+*/
+static void fts5Bm25Function(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+){
+  const double k1 = 1.2;          /* Constant "k1" from BM25 formula */
+  const double b = 0.75;          /* Constant "b" from BM25 formula */
+  int rc;                         /* Error code */
+  double score = 0.0;             /* SQL function return value */
+  Fts5Bm25Data *pData;            /* Values allocated/calculated once only */
+  int i;                          /* Iterator variable */
+  int nInst = 0;                  /* Value returned by xInstCount() */
+  double D = 0.0;                 /* Total number of tokens in row */
+  double *aFreq = 0;              /* Array of phrase freq. for current row */
+
+  /* Calculate the phrase frequency (symbol "f(qi,D)" in the documentation)
+  ** for each phrase in the query for the current row. */
+  rc = fts5Bm25GetData(pApi, pFts, &pData);
+  if( rc==SQLITE_OK ){
+    aFreq = pData->aFreq;
+    memset(aFreq, 0, sizeof(double) * pData->nPhrase);
+    rc = pApi->xInstCount(pFts, &nInst);
+  }
+  for(i=0; rc==SQLITE_OK && i<nInst; i++){
+    int ip; int ic; int io;
+    rc = pApi->xInst(pFts, i, &ip, &ic, &io);
+    if( rc==SQLITE_OK ){
+      double w = (nVal > ic) ? sqlite3_value_double(apVal[ic]) : 1.0;
+      aFreq[ip] += w;
+    }
+  }
+
+  /* Figure out the total size of the current row in tokens. */
+  if( rc==SQLITE_OK ){
+    int nTok;
+    rc = pApi->xColumnSize(pFts, -1, &nTok);
+    D = (double)nTok;
+  }
+
+  /* Determine and return the BM25 score for the current row. Or, if an
+  ** error has occurred, throw an exception. */
+  if( rc==SQLITE_OK ){
+    for(i=0; i<pData->nPhrase; i++){
+      score += pData->aIDF[i] * (
+          ( aFreq[i] * (k1 + 1.0) ) / 
+          ( aFreq[i] + k1 * (1 - b + b * D / pData->avgdl) )
+      );
+    }
+    sqlite3_result_double(pCtx, -1.0 * score);
+  }else{
+    sqlite3_result_error_code(pCtx, rc);
+  }
+}
+
+static int sqlite3Fts5AuxInit(fts5_api *pApi){
+  struct Builtin {
+    const char *zFunc;            /* Function name (nul-terminated) */
+    void *pUserData;              /* User-data pointer */
+    fts5_extension_function xFunc;/* Callback function */
+    void (*xDestroy)(void*);      /* Destructor function */
+  } aBuiltin [] = {
+    { "snippet",   0, fts5SnippetFunction, 0 },
+    { "highlight", 0, fts5HighlightFunction, 0 },
+    { "bm25",      0, fts5Bm25Function,    0 },
+  };
+  int rc = SQLITE_OK;             /* Return code */
+  int i;                          /* To iterate through builtin functions */
+
+  for(i=0; rc==SQLITE_OK && i<ArraySize(aBuiltin); i++){
+    rc = pApi->xCreateFunction(pApi,
+        aBuiltin[i].zFunc,
+        aBuiltin[i].pUserData,
+        aBuiltin[i].xFunc,
+        aBuiltin[i].xDestroy
+    );
+  }
+
+  return rc;
+}
+
+#line 1 "fts5_buffer.c"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+
+
+/* #include "fts5Int.h" */
+
+static int sqlite3Fts5BufferSize(int *pRc, Fts5Buffer *pBuf, u32 nByte){
+  if( (u32)pBuf->nSpace<nByte ){
+    u64 nNew = pBuf->nSpace ? pBuf->nSpace : 64;
+    u8 *pNew;
+    while( nNew<nByte ){
+      nNew = nNew * 2;
+    }
+    pNew = sqlite3_realloc64(pBuf->p, nNew);
+    if( pNew==0 ){
+      *pRc = SQLITE_NOMEM;
+      return 1;
+    }else{
+      pBuf->nSpace = (int)nNew;
+      pBuf->p = pNew;
+    }
+  }
+  return 0;
+}
+
+
+/*
+** Encode value iVal as an SQLite varint and append it to the buffer object
+** pBuf. If an OOM error occurs, set the error code in p.
+*/
+static void sqlite3Fts5BufferAppendVarint(int *pRc, Fts5Buffer *pBuf, i64 iVal){
+  if( fts5BufferGrow(pRc, pBuf, 9) ) return;
+  pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iVal);
+}
+
+static void sqlite3Fts5Put32(u8 *aBuf, int iVal){
+  aBuf[0] = (iVal>>24) & 0x00FF;
+  aBuf[1] = (iVal>>16) & 0x00FF;
+  aBuf[2] = (iVal>> 8) & 0x00FF;
+  aBuf[3] = (iVal>> 0) & 0x00FF;
+}
+
+static int sqlite3Fts5Get32(const u8 *aBuf){
+  return (int)((((u32)aBuf[0])<<24) + (aBuf[1]<<16) + (aBuf[2]<<8) + aBuf[3]);
+}
+
+/*
+** Append buffer nData/pData to buffer pBuf. If an OOM error occurs, set 
+** the error code in p. If an error has already occurred when this function
+** is called, it is a no-op.
+*/
+static void sqlite3Fts5BufferAppendBlob(
+  int *pRc,
+  Fts5Buffer *pBuf, 
+  u32 nData, 
+  const u8 *pData
+){
+  if( nData ){
+    if( fts5BufferGrow(pRc, pBuf, nData) ) return;
+    assert( pBuf->p!=0 );
+    memcpy(&pBuf->p[pBuf->n], pData, nData);
+    pBuf->n += nData;
+  }
+}
+
+/*
+** Append the nul-terminated string zStr to the buffer pBuf. This function
+** ensures that the byte following the buffer data is set to 0x00, even 
+** though this byte is not included in the pBuf->n count.
+*/
+static void sqlite3Fts5BufferAppendString(
+  int *pRc,
+  Fts5Buffer *pBuf, 
+  const char *zStr
+){
+  int nStr = (int)strlen(zStr);
+  sqlite3Fts5BufferAppendBlob(pRc, pBuf, nStr+1, (const u8*)zStr);
+  pBuf->n--;
+}
+
+/*
+** Argument zFmt is a printf() style format string. This function performs
+** the printf() style processing, then appends the results to buffer pBuf.
+**
+** Like sqlite3Fts5BufferAppendString(), this function ensures that the byte 
+** following the buffer data is set to 0x00, even though this byte is not
+** included in the pBuf->n count.
+*/ 
+static void sqlite3Fts5BufferAppendPrintf(
+  int *pRc,
+  Fts5Buffer *pBuf, 
+  char *zFmt, ...
+){
+  if( *pRc==SQLITE_OK ){
+    char *zTmp;
+    va_list ap;
+    va_start(ap, zFmt);
+    zTmp = sqlite3_vmprintf(zFmt, ap);
+    va_end(ap);
+
+    if( zTmp==0 ){
+      *pRc = SQLITE_NOMEM;
+    }else{
+      sqlite3Fts5BufferAppendString(pRc, pBuf, zTmp);
+      sqlite3_free(zTmp);
+    }
+  }
+}
+
+static char *sqlite3Fts5Mprintf(int *pRc, const char *zFmt, ...){
+  char *zRet = 0;
+  if( *pRc==SQLITE_OK ){
+    va_list ap;
+    va_start(ap, zFmt);
+    zRet = sqlite3_vmprintf(zFmt, ap);
+    va_end(ap);
+    if( zRet==0 ){
+      *pRc = SQLITE_NOMEM; 
+    }
+  }
+  return zRet;
+}
+ 
+
+/*
+** Free any buffer allocated by pBuf. Zero the structure before returning.
+*/
+static void sqlite3Fts5BufferFree(Fts5Buffer *pBuf){
+  sqlite3_free(pBuf->p);
+  memset(pBuf, 0, sizeof(Fts5Buffer));
+}
+
+/*
+** Zero the contents of the buffer object. But do not free the associated 
+** memory allocation.
+*/
+static void sqlite3Fts5BufferZero(Fts5Buffer *pBuf){
+  pBuf->n = 0;
+}
+
+/*
+** Set the buffer to contain nData/pData. If an OOM error occurs, leave an
+** the error code in p. If an error has already occurred when this function
+** is called, it is a no-op.
+*/
+static void sqlite3Fts5BufferSet(
+  int *pRc,
+  Fts5Buffer *pBuf, 
+  int nData, 
+  const u8 *pData
+){
+  pBuf->n = 0;
+  sqlite3Fts5BufferAppendBlob(pRc, pBuf, nData, pData);
+}
+
+static int sqlite3Fts5PoslistNext64(
+  const u8 *a, int n,             /* Buffer containing poslist */
+  int *pi,                        /* IN/OUT: Offset within a[] */
+  i64 *piOff                      /* IN/OUT: Current offset */
+){
+  int i = *pi;
+  assert( a!=0 || i==0 );
+  if( i>=n ){
+    /* EOF */
+    *piOff = -1;
+    return 1;  
+  }else{
+    i64 iOff = *piOff;
+    u32 iVal;
+    assert( a!=0 );
+    fts5FastGetVarint32(a, i, iVal);
+    if( iVal<=1 ){
+      if( iVal==0 ){
+        *pi = i;
+        return 0;
+      }
+      fts5FastGetVarint32(a, i, iVal);
+      iOff = ((i64)iVal) << 32;
+      assert( iOff>=0 );
+      fts5FastGetVarint32(a, i, iVal);
+      if( iVal<2 ){
+        /* This is a corrupt record. So stop parsing it here. */
+        *piOff = -1;
+        return 1;
+      }
+      *piOff = iOff + ((iVal-2) & 0x7FFFFFFF);
+    }else{
+      *piOff = (iOff & (i64)0x7FFFFFFF<<32)+((iOff + (iVal-2)) & 0x7FFFFFFF);
+    }
+    *pi = i;
+    assert_nc( *piOff>=iOff );
+    return 0;
+  }
+}
+
+
+/*
+** Advance the iterator object passed as the only argument. Return true
+** if the iterator reaches EOF, or false otherwise.
+*/
+static int sqlite3Fts5PoslistReaderNext(Fts5PoslistReader *pIter){
+  if( sqlite3Fts5PoslistNext64(pIter->a, pIter->n, &pIter->i, &pIter->iPos) ){
+    pIter->bEof = 1;
+  }
+  return pIter->bEof;
+}
+
+static int sqlite3Fts5PoslistReaderInit(
+  const u8 *a, int n,             /* Poslist buffer to iterate through */
+  Fts5PoslistReader *pIter        /* Iterator object to initialize */
+){
+  memset(pIter, 0, sizeof(*pIter));
+  pIter->a = a;
+  pIter->n = n;
+  sqlite3Fts5PoslistReaderNext(pIter);
+  return pIter->bEof;
+}
+
+/*
+** Append position iPos to the position list being accumulated in buffer
+** pBuf, which must be already be large enough to hold the new data.
+** The previous position written to this list is *piPrev. *piPrev is set
+** to iPos before returning.
+*/
+static void sqlite3Fts5PoslistSafeAppend(
+  Fts5Buffer *pBuf, 
+  i64 *piPrev, 
+  i64 iPos
+){
+  if( iPos>=*piPrev ){
+    static const i64 colmask = ((i64)(0x7FFFFFFF)) << 32;
+    if( (iPos & colmask) != (*piPrev & colmask) ){
+      pBuf->p[pBuf->n++] = 1;
+      pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], (iPos>>32));
+      *piPrev = (iPos & colmask);
+    }
+    pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], (iPos-*piPrev)+2);
+    *piPrev = iPos;
+  }
+}
+
+static int sqlite3Fts5PoslistWriterAppend(
+  Fts5Buffer *pBuf, 
+  Fts5PoslistWriter *pWriter,
+  i64 iPos
+){
+  int rc = 0;   /* Initialized only to suppress erroneous warning from Clang */
+  if( fts5BufferGrow(&rc, pBuf, 5+5+5) ) return rc;
+  sqlite3Fts5PoslistSafeAppend(pBuf, &pWriter->iPrev, iPos);
+  return SQLITE_OK;
+}
+
+static void *sqlite3Fts5MallocZero(int *pRc, sqlite3_int64 nByte){
+  void *pRet = 0;
+  if( *pRc==SQLITE_OK ){
+    pRet = sqlite3_malloc64(nByte);
+    if( pRet==0 ){
+      if( nByte>0 ) *pRc = SQLITE_NOMEM;
+    }else{
+      memset(pRet, 0, (size_t)nByte);
+    }
+  }
+  return pRet;
+}
+
+/*
+** Return a nul-terminated copy of the string indicated by pIn. If nIn
+** is non-negative, then it is the length of the string in bytes. Otherwise,
+** the length of the string is determined using strlen().
+**
+** It is the responsibility of the caller to eventually free the returned
+** buffer using sqlite3_free(). If an OOM error occurs, NULL is returned. 
+*/
+static char *sqlite3Fts5Strndup(int *pRc, const char *pIn, int nIn){
+  char *zRet = 0;
+  if( *pRc==SQLITE_OK ){
+    if( nIn<0 ){
+      nIn = (int)strlen(pIn);
+    }
+    zRet = (char*)sqlite3_malloc(nIn+1);
+    if( zRet ){
+      memcpy(zRet, pIn, nIn);
+      zRet[nIn] = '\0';
+    }else{
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+  return zRet;
+}
+
+
+/*
+** Return true if character 't' may be part of an FTS5 bareword, or false
+** otherwise. Characters that may be part of barewords:
+**
+**   * All non-ASCII characters,
+**   * The 52 upper and lower case ASCII characters, and
+**   * The 10 integer ASCII characters.
+**   * The underscore character "_" (0x5F).
+**   * The unicode "subsitute" character (0x1A).
+*/
+static int sqlite3Fts5IsBareword(char t){
+  u8 aBareword[128] = {
+    0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 0, 0, 0, 0, 0, 0,   /* 0x00 .. 0x0F */
+    0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 1, 0, 0, 0, 0, 0,   /* 0x10 .. 0x1F */
+    0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 0, 0, 0, 0, 0, 0,   /* 0x20 .. 0x2F */
+    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 0, 0, 0, 0, 0, 0,   /* 0x30 .. 0x3F */
+    0, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 1, 1, 1, 1, 1,   /* 0x40 .. 0x4F */
+    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 0, 0, 0, 0, 1,   /* 0x50 .. 0x5F */
+    0, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 1, 1, 1, 1, 1,   /* 0x60 .. 0x6F */
+    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 0, 0, 0, 0, 0    /* 0x70 .. 0x7F */
+  };
+
+  return (t & 0x80) || aBareword[(int)t];
+}
+
+
+/*************************************************************************
+*/
+typedef struct Fts5TermsetEntry Fts5TermsetEntry;
+struct Fts5TermsetEntry {
+  char *pTerm;
+  int nTerm;
+  int iIdx;                       /* Index (main or aPrefix[] entry) */
+  Fts5TermsetEntry *pNext;
+};
+
+struct Fts5Termset {
+  Fts5TermsetEntry *apHash[512];
+};
+
+static int sqlite3Fts5TermsetNew(Fts5Termset **pp){
+  int rc = SQLITE_OK;
+  *pp = sqlite3Fts5MallocZero(&rc, sizeof(Fts5Termset));
+  return rc;
+}
+
+static int sqlite3Fts5TermsetAdd(
+  Fts5Termset *p, 
+  int iIdx,
+  const char *pTerm, int nTerm, 
+  int *pbPresent
+){
+  int rc = SQLITE_OK;
+  *pbPresent = 0;
+  if( p ){
+    int i;
+    u32 hash = 13;
+    Fts5TermsetEntry *pEntry;
+
+    /* Calculate a hash value for this term. This is the same hash checksum
+    ** used by the fts5_hash.c module. This is not important for correct
+    ** operation of the module, but is necessary to ensure that some tests
+    ** designed to produce hash table collisions really do work.  */
+    for(i=nTerm-1; i>=0; i--){
+      hash = (hash << 3) ^ hash ^ pTerm[i];
+    }
+    hash = (hash << 3) ^ hash ^ iIdx;
+    hash = hash % ArraySize(p->apHash);
+
+    for(pEntry=p->apHash[hash]; pEntry; pEntry=pEntry->pNext){
+      if( pEntry->iIdx==iIdx 
+          && pEntry->nTerm==nTerm 
+          && memcmp(pEntry->pTerm, pTerm, nTerm)==0 
+      ){
+        *pbPresent = 1;
+        break;
+      }
+    }
+
+    if( pEntry==0 ){
+      pEntry = sqlite3Fts5MallocZero(&rc, sizeof(Fts5TermsetEntry) + nTerm);
+      if( pEntry ){
+        pEntry->pTerm = (char*)&pEntry[1];
+        pEntry->nTerm = nTerm;
+        pEntry->iIdx = iIdx;
+        memcpy(pEntry->pTerm, pTerm, nTerm);
+        pEntry->pNext = p->apHash[hash];
+        p->apHash[hash] = pEntry;
+      }
+    }
+  }
+
+  return rc;
+}
+
+static void sqlite3Fts5TermsetFree(Fts5Termset *p){
+  if( p ){
+    u32 i;
+    for(i=0; i<ArraySize(p->apHash); i++){
+      Fts5TermsetEntry *pEntry = p->apHash[i];
+      while( pEntry ){
+        Fts5TermsetEntry *pDel = pEntry;
+        pEntry = pEntry->pNext;
+        sqlite3_free(pDel);
+      }
+    }
+    sqlite3_free(p);
+  }
+}
+
+#line 1 "fts5_config.c"
+/*
+** 2014 Jun 09
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This is an SQLite module implementing full-text search.
+*/
+
+
+/* #include "fts5Int.h" */
+
+#define FTS5_DEFAULT_PAGE_SIZE   4050
+#define FTS5_DEFAULT_AUTOMERGE      4
+#define FTS5_DEFAULT_USERMERGE      4
+#define FTS5_DEFAULT_CRISISMERGE   16
+#define FTS5_DEFAULT_HASHSIZE    (1024*1024)
+
+#define FTS5_DEFAULT_DELETE_AUTOMERGE 10      /* default 10% */
+
+/* Maximum allowed page size */
+#define FTS5_MAX_PAGE_SIZE (64*1024)
+
+static int fts5_iswhitespace(char x){
+  return (x==' ');
+}
+
+static int fts5_isopenquote(char x){
+  return (x=='"' || x=='\'' || x=='[' || x=='`');
+}
+
+/*
+** Argument pIn points to a character that is part of a nul-terminated 
+** string. Return a pointer to the first character following *pIn in 
+** the string that is not a white-space character.
+*/
+static const char *fts5ConfigSkipWhitespace(const char *pIn){
+  const char *p = pIn;
+  if( p ){
+    while( fts5_iswhitespace(*p) ){ p++; }
+  }
+  return p;
+}
+
+/*
+** Argument pIn points to a character that is part of a nul-terminated 
+** string. Return a pointer to the first character following *pIn in 
+** the string that is not a "bareword" character.
+*/
+static const char *fts5ConfigSkipBareword(const char *pIn){
+  const char *p = pIn;
+  while ( sqlite3Fts5IsBareword(*p) ) p++;
+  if( p==pIn ) p = 0;
+  return p;
+}
+
+static int fts5_isdigit(char a){
+  return (a>='0' && a<='9');
+}
+
+
+
+static const char *fts5ConfigSkipLiteral(const char *pIn){
+  const char *p = pIn;
+  switch( *p ){
+    case 'n': case 'N':
+      if( sqlite3_strnicmp("null", p, 4)==0 ){
+        p = &p[4];
+      }else{
+        p = 0;
+      }
+      break;
+
+    case 'x': case 'X':
+      p++;
+      if( *p=='\'' ){
+        p++;
+        while( (*p>='a' && *p<='f') 
+            || (*p>='A' && *p<='F') 
+            || (*p>='0' && *p<='9') 
+            ){
+          p++;
+        }
+        if( *p=='\'' && 0==((p-pIn)%2) ){
+          p++;
+        }else{
+          p = 0;
+        }
+      }else{
+        p = 0;
+      }
+      break;
+
+    case '\'':
+      p++;
+      while( p ){
+        if( *p=='\'' ){
+          p++;
+          if( *p!='\'' ) break;
+        }
+        p++;
+        if( *p==0 ) p = 0;
+      }
+      break;
+
+    default:
+      /* maybe a number */
+      if( *p=='+' || *p=='-' ) p++;
+      while( fts5_isdigit(*p) ) p++;
+
+      /* At this point, if the literal was an integer, the parse is 
+      ** finished. Or, if it is a floating point value, it may continue
+      ** with either a decimal point or an 'E' character. */
+      if( *p=='.' && fts5_isdigit(p[1]) ){
+        p += 2;
+        while( fts5_isdigit(*p) ) p++;
+      }
+      if( p==pIn ) p = 0;
+
+      break;
+  }
+
+  return p;
+}
+
+/*
+** The first character of the string pointed to by argument z is guaranteed
+** to be an open-quote character (see function fts5_isopenquote()).
+**
+** This function searches for the corresponding close-quote character within
+** the string and, if found, dequotes the string in place and adds a new
+** nul-terminator byte.
+**
+** If the close-quote is found, the value returned is the byte offset of
+** the character immediately following it. Or, if the close-quote is not 
+** found, -1 is returned. If -1 is returned, the buffer is left in an 
+** undefined state.
+*/
+static int fts5Dequote(char *z){
+  char q;
+  int iIn = 1;
+  int iOut = 0;
+  q = z[0];
+
+  /* Set stack variable q to the close-quote character */
+  assert( q=='[' || q=='\'' || q=='"' || q=='`' );
+  if( q=='[' ) q = ']';  
+
+  while( z[iIn] ){
+    if( z[iIn]==q ){
+      if( z[iIn+1]!=q ){
+        /* Character iIn was the close quote. */
+        iIn++;
+        break;
+      }else{
+        /* Character iIn and iIn+1 form an escaped quote character. Skip
+        ** the input cursor past both and copy a single quote character 
+        ** to the output buffer. */
+        iIn += 2;
+        z[iOut++] = q;
+      }
+    }else{
+      z[iOut++] = z[iIn++];
+    }
+  }
+
+  z[iOut] = '\0';
+  return iIn;
+}
+
+/*
+** Convert an SQL-style quoted string into a normal string by removing
+** the quote characters.  The conversion is done in-place.  If the
+** input does not begin with a quote character, then this routine
+** is a no-op.
+**
+** Examples:
+**
+**     "abc"   becomes   abc
+**     'xyz'   becomes   xyz
+**     [pqr]   becomes   pqr
+**     `mno`   becomes   mno
+*/
+static void sqlite3Fts5Dequote(char *z){
+  char quote;                     /* Quote character (if any ) */
+
+  assert( 0==fts5_iswhitespace(z[0]) );
+  quote = z[0];
+  if( quote=='[' || quote=='\'' || quote=='"' || quote=='`' ){
+    fts5Dequote(z);
+  }
+}
+
+
+struct Fts5Enum {
+  const char *zName;
+  int eVal;
+};
+typedef struct Fts5Enum Fts5Enum;
+
+static int fts5ConfigSetEnum(
+  const Fts5Enum *aEnum, 
+  const char *zEnum, 
+  int *peVal
+){
+  int nEnum = (int)strlen(zEnum);
+  int i;
+  int iVal = -1;
+
+  for(i=0; aEnum[i].zName; i++){
+    if( sqlite3_strnicmp(aEnum[i].zName, zEnum, nEnum)==0 ){
+      if( iVal>=0 ) return SQLITE_ERROR;
+      iVal = aEnum[i].eVal;
+    }
+  }
+
+  *peVal = iVal;
+  return iVal<0 ? SQLITE_ERROR : SQLITE_OK;
+}
+
+/*
+** Parse a "special" CREATE VIRTUAL TABLE directive and update
+** configuration object pConfig as appropriate.
+**
+** If successful, object pConfig is updated and SQLITE_OK returned. If
+** an error occurs, an SQLite error code is returned and an error message
+** may be left in *pzErr. It is the responsibility of the caller to
+** eventually free any such error message using sqlite3_free().
+*/
+static int fts5ConfigParseSpecial(
+  Fts5Global *pGlobal,
+  Fts5Config *pConfig,            /* Configuration object to update */
+  const char *zCmd,               /* Special command to parse */
+  const char *zArg,               /* Argument to parse */
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc = SQLITE_OK;
+  int nCmd = (int)strlen(zCmd);
+  if( sqlite3_strnicmp("prefix", zCmd, nCmd)==0 ){
+    const int nByte = sizeof(int) * FTS5_MAX_PREFIX_INDEXES;
+    const char *p;
+    int bFirst = 1;
+    if( pConfig->aPrefix==0 ){
+      pConfig->aPrefix = sqlite3Fts5MallocZero(&rc, nByte);
+      if( rc ) return rc;
+    }
+
+    p = zArg;
+    while( 1 ){
+      int nPre = 0;
+
+      while( p[0]==' ' ) p++;
+      if( bFirst==0 && p[0]==',' ){
+        p++;
+        while( p[0]==' ' ) p++;
+      }else if( p[0]=='\0' ){
+        break;
+      }
+      if( p[0]<'0' || p[0]>'9' ){
+        *pzErr = sqlite3_mprintf("malformed prefix=... directive");
+        rc = SQLITE_ERROR;
+        break;
+      }
+
+      if( pConfig->nPrefix==FTS5_MAX_PREFIX_INDEXES ){
+        *pzErr = sqlite3_mprintf(
+            "too many prefix indexes (max %d)", FTS5_MAX_PREFIX_INDEXES
+        );
+        rc = SQLITE_ERROR;
+        break;
+      }
+
+      while( p[0]>='0' && p[0]<='9' && nPre<1000 ){
+        nPre = nPre*10 + (p[0] - '0');
+        p++;
+      }
+
+      if( nPre<=0 || nPre>=1000 ){
+        *pzErr = sqlite3_mprintf("prefix length out of range (max 999)");
+        rc = SQLITE_ERROR;
+        break;
+      }
+
+      pConfig->aPrefix[pConfig->nPrefix] = nPre;
+      pConfig->nPrefix++;
+      bFirst = 0;
+    }
+    assert( pConfig->nPrefix<=FTS5_MAX_PREFIX_INDEXES );
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("tokenize", zCmd, nCmd)==0 ){
+    const char *p = (const char*)zArg;
+    sqlite3_int64 nArg = strlen(zArg) + 1;
+    char **azArg = sqlite3Fts5MallocZero(&rc, sizeof(char*) * nArg);
+    char *pDel = sqlite3Fts5MallocZero(&rc, nArg * 2);
+    char *pSpace = pDel;
+
+    if( azArg && pSpace ){
+      if( pConfig->pTok ){
+        *pzErr = sqlite3_mprintf("multiple tokenize=... directives");
+        rc = SQLITE_ERROR;
+      }else{
+        for(nArg=0; p && *p; nArg++){
+          const char *p2 = fts5ConfigSkipWhitespace(p);
+          if( *p2=='\'' ){
+            p = fts5ConfigSkipLiteral(p2);
+          }else{
+            p = fts5ConfigSkipBareword(p2);
+          }
+          if( p ){
+            memcpy(pSpace, p2, p-p2);
+            azArg[nArg] = pSpace;
+            sqlite3Fts5Dequote(pSpace);
+            pSpace += (p - p2) + 1;
+            p = fts5ConfigSkipWhitespace(p);
+          }
+        }
+        if( p==0 ){
+          *pzErr = sqlite3_mprintf("parse error in tokenize directive");
+          rc = SQLITE_ERROR;
+        }else{
+          rc = sqlite3Fts5GetTokenizer(pGlobal, 
+              (const char**)azArg, (int)nArg, pConfig,
+              pzErr
+          );
+        }
+      }
+    }
+
+    sqlite3_free(azArg);
+    sqlite3_free(pDel);
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("content", zCmd, nCmd)==0 ){
+    if( pConfig->eContent!=FTS5_CONTENT_NORMAL ){
+      *pzErr = sqlite3_mprintf("multiple content=... directives");
+      rc = SQLITE_ERROR;
+    }else{
+      if( zArg[0] ){
+        pConfig->eContent = FTS5_CONTENT_EXTERNAL;
+        pConfig->zContent = sqlite3Fts5Mprintf(&rc, "%Q.%Q", pConfig->zDb,zArg);
+      }else{
+        pConfig->eContent = FTS5_CONTENT_NONE;
+      }
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("contentless_delete", zCmd, nCmd)==0 ){
+    if( (zArg[0]!='0' && zArg[0]!='1') || zArg[1]!='\0' ){
+      *pzErr = sqlite3_mprintf("malformed contentless_delete=... directive");
+      rc = SQLITE_ERROR;
+    }else{
+      pConfig->bContentlessDelete = (zArg[0]=='1');
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("content_rowid", zCmd, nCmd)==0 ){
+    if( pConfig->zContentRowid ){
+      *pzErr = sqlite3_mprintf("multiple content_rowid=... directives");
+      rc = SQLITE_ERROR;
+    }else{
+      pConfig->zContentRowid = sqlite3Fts5Strndup(&rc, zArg, -1);
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("columnsize", zCmd, nCmd)==0 ){
+    if( (zArg[0]!='0' && zArg[0]!='1') || zArg[1]!='\0' ){
+      *pzErr = sqlite3_mprintf("malformed columnsize=... directive");
+      rc = SQLITE_ERROR;
+    }else{
+      pConfig->bColumnsize = (zArg[0]=='1');
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("detail", zCmd, nCmd)==0 ){
+    const Fts5Enum aDetail[] = {
+      { "none", FTS5_DETAIL_NONE },
+      { "full", FTS5_DETAIL_FULL },
+      { "columns", FTS5_DETAIL_COLUMNS },
+      { 0, 0 }
+    };
+
+    if( (rc = fts5ConfigSetEnum(aDetail, zArg, &pConfig->eDetail)) ){
+      *pzErr = sqlite3_mprintf("malformed detail=... directive");
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("tokendata", zCmd, nCmd)==0 ){
+    if( (zArg[0]!='0' && zArg[0]!='1') || zArg[1]!='\0' ){
+      *pzErr = sqlite3_mprintf("malformed tokendata=... directive");
+      rc = SQLITE_ERROR;
+    }else{
+      pConfig->bTokendata = (zArg[0]=='1');
+    }
+    return rc;
+  }
+
+  *pzErr = sqlite3_mprintf("unrecognized option: \"%.*s\"", nCmd, zCmd);
+  return SQLITE_ERROR;
+}
+
+/*
+** Allocate an instance of the default tokenizer ("simple") at 
+** Fts5Config.pTokenizer. Return SQLITE_OK if successful, or an SQLite error
+** code if an error occurs.
+*/
+static int fts5ConfigDefaultTokenizer(Fts5Global *pGlobal, Fts5Config *pConfig){
+  assert( pConfig->pTok==0 && pConfig->pTokApi==0 );
+  return sqlite3Fts5GetTokenizer(pGlobal, 0, 0, pConfig, 0);
+}
+
+/*
+** Gobble up the first bareword or quoted word from the input buffer zIn.
+** Return a pointer to the character immediately following the last in
+** the gobbled word if successful, or a NULL pointer otherwise (failed
+** to find close-quote character).
+**
+** Before returning, set pzOut to point to a new buffer containing a
+** nul-terminated, dequoted copy of the gobbled word. If the word was
+** quoted, *pbQuoted is also set to 1 before returning.
+**
+** If *pRc is other than SQLITE_OK when this function is called, it is
+** a no-op (NULL is returned). Otherwise, if an OOM occurs within this
+** function, *pRc is set to SQLITE_NOMEM before returning. *pRc is *not*
+** set if a parse error (failed to find close quote) occurs.
+*/
+static const char *fts5ConfigGobbleWord(
+  int *pRc,                       /* IN/OUT: Error code */
+  const char *zIn,                /* Buffer to gobble string/bareword from */
+  char **pzOut,                   /* OUT: malloc'd buffer containing str/bw */
+  int *pbQuoted                   /* OUT: Set to true if dequoting required */
+){
+  const char *zRet = 0;
+
+  sqlite3_int64 nIn = strlen(zIn);
+  char *zOut = sqlite3_malloc64(nIn+1);
+
+  assert( *pRc==SQLITE_OK );
+  *pbQuoted = 0;
+  *pzOut = 0;
+
+  if( zOut==0 ){
+    *pRc = SQLITE_NOMEM;
+  }else{
+    memcpy(zOut, zIn, (size_t)(nIn+1));
+    if( fts5_isopenquote(zOut[0]) ){
+      int ii = fts5Dequote(zOut);
+      zRet = &zIn[ii];
+      *pbQuoted = 1;
+    }else{
+      zRet = fts5ConfigSkipBareword(zIn);
+      if( zRet ){
+        zOut[zRet-zIn] = '\0';
+      }
+    }
+  }
+
+  if( zRet==0 ){
+    sqlite3_free(zOut);
+  }else{
+    *pzOut = zOut;
+  }
+
+  return zRet;
+}
+
+static int fts5ConfigParseColumn(
+  Fts5Config *p, 
+  char *zCol, 
+  char *zArg, 
+  char **pzErr
+){
+  int rc = SQLITE_OK;
+  if( 0==sqlite3_stricmp(zCol, FTS5_RANK_NAME) 
+   || 0==sqlite3_stricmp(zCol, FTS5_ROWID_NAME) 
+  ){
+    *pzErr = sqlite3_mprintf("reserved fts5 column name: %s", zCol);
+    rc = SQLITE_ERROR;
+  }else if( zArg ){
+    if( 0==sqlite3_stricmp(zArg, "unindexed") ){
+      p->abUnindexed[p->nCol] = 1;
+    }else{
+      *pzErr = sqlite3_mprintf("unrecognized column option: %s", zArg);
+      rc = SQLITE_ERROR;
+    }
+  }
+
+  p->azCol[p->nCol++] = zCol;
+  return rc;
+}
+
+/*
+** Populate the Fts5Config.zContentExprlist string.
+*/
+static int fts5ConfigMakeExprlist(Fts5Config *p){
+  int i;
+  int rc = SQLITE_OK;
+  Fts5Buffer buf = {0, 0, 0};
+
+  sqlite3Fts5BufferAppendPrintf(&rc, &buf, "T.%Q", p->zContentRowid);
+  if( p->eContent!=FTS5_CONTENT_NONE ){
+    for(i=0; i<p->nCol; i++){
+      if( p->eContent==FTS5_CONTENT_EXTERNAL ){
+        sqlite3Fts5BufferAppendPrintf(&rc, &buf, ", T.%Q", p->azCol[i]);
+      }else{
+        sqlite3Fts5BufferAppendPrintf(&rc, &buf, ", T.c%d", i);
+      }
+    }
+  }
+
+  assert( p->zContentExprlist==0 );
+  p->zContentExprlist = (char*)buf.p;
+  return rc;
+}
+
+/*
+** Arguments nArg/azArg contain the string arguments passed to the xCreate
+** or xConnect method of the virtual table. This function attempts to 
+** allocate an instance of Fts5Config containing the results of parsing
+** those arguments.
+**
+** If successful, SQLITE_OK is returned and *ppOut is set to point to the
+** new Fts5Config object. If an error occurs, an SQLite error code is 
+** returned, *ppOut is set to NULL and an error message may be left in
+** *pzErr. It is the responsibility of the caller to eventually free any 
+** such error message using sqlite3_free().
+*/
+static int sqlite3Fts5ConfigParse(
+  Fts5Global *pGlobal,
+  sqlite3 *db,
+  int nArg,                       /* Number of arguments */
+  const char **azArg,             /* Array of nArg CREATE VIRTUAL TABLE args */
+  Fts5Config **ppOut,             /* OUT: Results of parse */
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Config *pRet;               /* New object to return */
+  int i;
+  sqlite3_int64 nByte;
+
+  *ppOut = pRet = (Fts5Config*)sqlite3_malloc(sizeof(Fts5Config));
+  if( pRet==0 ) return SQLITE_NOMEM;
+  memset(pRet, 0, sizeof(Fts5Config));
+  pRet->db = db;
+  pRet->iCookie = -1;
+
+  nByte = nArg * (sizeof(char*) + sizeof(u8));
+  pRet->azCol = (char**)sqlite3Fts5MallocZero(&rc, nByte);
+  pRet->abUnindexed = pRet->azCol ? (u8*)&pRet->azCol[nArg] : 0;
+  pRet->zDb = sqlite3Fts5Strndup(&rc, azArg[1], -1);
+  pRet->zName = sqlite3Fts5Strndup(&rc, azArg[2], -1);
+  pRet->bColumnsize = 1;
+  pRet->eDetail = FTS5_DETAIL_FULL;
+#ifdef SQLITE_DEBUG
+  pRet->bPrefixIndex = 1;
+#endif
+  if( rc==SQLITE_OK && sqlite3_stricmp(pRet->zName, FTS5_RANK_NAME)==0 ){
+    *pzErr = sqlite3_mprintf("reserved fts5 table name: %s", pRet->zName);
+    rc = SQLITE_ERROR;
+  }
+
+  assert( (pRet->abUnindexed && pRet->azCol) || rc!=SQLITE_OK );
+  for(i=3; rc==SQLITE_OK && i<nArg; i++){
+    const char *zOrig = azArg[i];
+    const char *z;
+    char *zOne = 0;
+    char *zTwo = 0;
+    int bOption = 0;
+    int bMustBeCol = 0;
+
+    z = fts5ConfigGobbleWord(&rc, zOrig, &zOne, &bMustBeCol);
+    z = fts5ConfigSkipWhitespace(z);
+    if( z && *z=='=' ){
+      bOption = 1;
+      assert( zOne!=0 );
+      z++;
+      if( bMustBeCol ) z = 0;
+    }
+    z = fts5ConfigSkipWhitespace(z);
+    if( z && z[0] ){
+      int bDummy;
+      z = fts5ConfigGobbleWord(&rc, z, &zTwo, &bDummy);
+      if( z && z[0] ) z = 0;
+    }
+
+    if( rc==SQLITE_OK ){
+      if( z==0 ){
+        *pzErr = sqlite3_mprintf("parse error in \"%s\"", zOrig);
+        rc = SQLITE_ERROR;
+      }else{
+        if( bOption ){
+          rc = fts5ConfigParseSpecial(pGlobal, pRet, 
+            ALWAYS(zOne)?zOne:"",
+            zTwo?zTwo:"",
+            pzErr
+          );
+        }else{
+          rc = fts5ConfigParseColumn(pRet, zOne, zTwo, pzErr);
+          zOne = 0;
+        }
+      }
+    }
+
+    sqlite3_free(zOne);
+    sqlite3_free(zTwo);
+  }
+
+  /* We only allow contentless_delete=1 if the table is indeed contentless. */
+  if( rc==SQLITE_OK 
+   && pRet->bContentlessDelete 
+   && pRet->eContent!=FTS5_CONTENT_NONE 
+  ){
+    *pzErr = sqlite3_mprintf(
+        "contentless_delete=1 requires a contentless table"
+    );
+    rc = SQLITE_ERROR;
+  }
+
+  /* We only allow contentless_delete=1 if columnsize=0 is not present. 
+  **
+  ** This restriction may be removed at some point. 
+  */
+  if( rc==SQLITE_OK && pRet->bContentlessDelete && pRet->bColumnsize==0 ){
+    *pzErr = sqlite3_mprintf(
+        "contentless_delete=1 is incompatible with columnsize=0"
+    );
+    rc = SQLITE_ERROR;
+  }
+
+  /* If a tokenizer= option was successfully parsed, the tokenizer has
+  ** already been allocated. Otherwise, allocate an instance of the default
+  ** tokenizer (unicode61) now.  */
+  if( rc==SQLITE_OK && pRet->pTok==0 ){
+    rc = fts5ConfigDefaultTokenizer(pGlobal, pRet);
+  }
+
+  /* If no zContent option was specified, fill in the default values. */
+  if( rc==SQLITE_OK && pRet->zContent==0 ){
+    const char *zTail = 0;
+    assert( pRet->eContent==FTS5_CONTENT_NORMAL 
+         || pRet->eContent==FTS5_CONTENT_NONE 
+    );
+    if( pRet->eContent==FTS5_CONTENT_NORMAL ){
+      zTail = "content";
+    }else if( pRet->bColumnsize ){
+      zTail = "docsize";
+    }
+
+    if( zTail ){
+      pRet->zContent = sqlite3Fts5Mprintf(
+          &rc, "%Q.'%q_%s'", pRet->zDb, pRet->zName, zTail
+      );
+    }
+  }
+
+  if( rc==SQLITE_OK && pRet->zContentRowid==0 ){
+    pRet->zContentRowid = sqlite3Fts5Strndup(&rc, "rowid", -1);
+  }
+
+  /* Formulate the zContentExprlist text */
+  if( rc==SQLITE_OK ){
+    rc = fts5ConfigMakeExprlist(pRet);
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3Fts5ConfigFree(pRet);
+    *ppOut = 0;
+  }
+  return rc;
+}
+
+/*
+** Free the configuration object passed as the only argument.
+*/
+static void sqlite3Fts5ConfigFree(Fts5Config *pConfig){
+  if( pConfig ){
+    int i;
+    if( pConfig->pTok ){
+      pConfig->pTokApi->xDelete(pConfig->pTok);
+    }
+    sqlite3_free(pConfig->zDb);
+    sqlite3_free(pConfig->zName);
+    for(i=0; i<pConfig->nCol; i++){
+      sqlite3_free(pConfig->azCol[i]);
+    }
+    sqlite3_free(pConfig->azCol);
+    sqlite3_free(pConfig->aPrefix);
+    sqlite3_free(pConfig->zRank);
+    sqlite3_free(pConfig->zRankArgs);
+    sqlite3_free(pConfig->zContent);
+    sqlite3_free(pConfig->zContentRowid);
+    sqlite3_free(pConfig->zContentExprlist);
+    sqlite3_free(pConfig);
+  }
+}
+
+/*
+** Call sqlite3_declare_vtab() based on the contents of the configuration
+** object passed as the only argument. Return SQLITE_OK if successful, or
+** an SQLite error code if an error occurs.
+*/
+static int sqlite3Fts5ConfigDeclareVtab(Fts5Config *pConfig){
+  int i;
+  int rc = SQLITE_OK;
+  char *zSql;
+
+  zSql = sqlite3Fts5Mprintf(&rc, "CREATE TABLE x(");
+  for(i=0; zSql && i<pConfig->nCol; i++){
+    const char *zSep = (i==0?"":", ");
+    zSql = sqlite3Fts5Mprintf(&rc, "%z%s%Q", zSql, zSep, pConfig->azCol[i]);
+  }
+  zSql = sqlite3Fts5Mprintf(&rc, "%z, %Q HIDDEN, %s HIDDEN)", 
+      zSql, pConfig->zName, FTS5_RANK_NAME
+  );
+
+  assert( zSql || rc==SQLITE_NOMEM );
+  if( zSql ){
+    rc = sqlite3_declare_vtab(pConfig->db, zSql);
+    sqlite3_free(zSql);
+  }
+ 
+  return rc;
+}
+
+/*
+** Tokenize the text passed via the second and third arguments.
+**
+** The callback is invoked once for each token in the input text. The
+** arguments passed to it are, in order:
+**
+**     void *pCtx          // Copy of 4th argument to sqlite3Fts5Tokenize()
+**     const char *pToken  // Pointer to buffer containing token
+**     int nToken          // Size of token in bytes
+**     int iStart          // Byte offset of start of token within input text
+**     int iEnd            // Byte offset of end of token within input text
+**     int iPos            // Position of token in input (first token is 0)
+**
+** If the callback returns a non-zero value the tokenization is abandoned
+** and no further callbacks are issued. 
+**
+** This function returns SQLITE_OK if successful or an SQLite error code
+** if an error occurs. If the tokenization was abandoned early because
+** the callback returned SQLITE_DONE, this is not an error and this function
+** still returns SQLITE_OK. Or, if the tokenization was abandoned early
+** because the callback returned another non-zero value, it is assumed
+** to be an SQLite error code and returned to the caller.
+*/
+static int sqlite3Fts5Tokenize(
+  Fts5Config *pConfig,            /* FTS5 Configuration object */
+  int flags,                      /* FTS5_TOKENIZE_* flags */
+  const char *pText, int nText,   /* Text to tokenize */
+  void *pCtx,                     /* Context passed to xToken() */
+  int (*xToken)(void*, int, const char*, int, int, int)    /* Callback */
+){
+  if( pText==0 ) return SQLITE_OK;
+  return pConfig->pTokApi->xTokenize(
+      pConfig->pTok, pCtx, flags, pText, nText, xToken
+  );
+}
+
+/*
+** Argument pIn points to the first character in what is expected to be
+** a comma-separated list of SQL literals followed by a ')' character.
+** If it actually is this, return a pointer to the ')'. Otherwise, return
+** NULL to indicate a parse error.
+*/
+static const char *fts5ConfigSkipArgs(const char *pIn){
+  const char *p = pIn;
+  
+  while( 1 ){
+    p = fts5ConfigSkipWhitespace(p);
+    p = fts5ConfigSkipLiteral(p);
+    p = fts5ConfigSkipWhitespace(p);
+    if( p==0 || *p==')' ) break;
+    if( *p!=',' ){
+      p = 0;
+      break;
+    }
+    p++;
+  }
+
+  return p;
+}
+
+/*
+** Parameter zIn contains a rank() function specification. The format of 
+** this is:
+**
+**   + Bareword (function name)
+**   + Open parenthesis - "("
+**   + Zero or more SQL literals in a comma separated list
+**   + Close parenthesis - ")"
+*/
+static int sqlite3Fts5ConfigParseRank(
+  const char *zIn,                /* Input string */
+  char **pzRank,                  /* OUT: Rank function name */
+  char **pzRankArgs               /* OUT: Rank function arguments */
+){
+  const char *p = zIn;
+  const char *pRank;
+  char *zRank = 0;
+  char *zRankArgs = 0;
+  int rc = SQLITE_OK;
+
+  *pzRank = 0;
+  *pzRankArgs = 0;
+
+  if( p==0 ){
+    rc = SQLITE_ERROR;
+  }else{
+    p = fts5ConfigSkipWhitespace(p);
+    pRank = p;
+    p = fts5ConfigSkipBareword(p);
+
+    if( p ){
+      zRank = sqlite3Fts5MallocZero(&rc, 1 + p - pRank);
+      if( zRank ) memcpy(zRank, pRank, p-pRank);
+    }else{
+      rc = SQLITE_ERROR;
+    }
+
+    if( rc==SQLITE_OK ){
+      p = fts5ConfigSkipWhitespace(p);
+      if( *p!='(' ) rc = SQLITE_ERROR;
+      p++;
+    }
+    if( rc==SQLITE_OK ){
+      const char *pArgs; 
+      p = fts5ConfigSkipWhitespace(p);
+      pArgs = p;
+      if( *p!=')' ){
+        p = fts5ConfigSkipArgs(p);
+        if( p==0 ){
+          rc = SQLITE_ERROR;
+        }else{
+          zRankArgs = sqlite3Fts5MallocZero(&rc, 1 + p - pArgs);
+          if( zRankArgs ) memcpy(zRankArgs, pArgs, p-pArgs);
+        }
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_free(zRank);
+    assert( zRankArgs==0 );
+  }else{
+    *pzRank = zRank;
+    *pzRankArgs = zRankArgs;
+  }
+  return rc;
+}
+
+static int sqlite3Fts5ConfigSetValue(
+  Fts5Config *pConfig, 
+  const char *zKey, 
+  sqlite3_value *pVal,
+  int *pbBadkey
+){
+  int rc = SQLITE_OK;
+
+  if( 0==sqlite3_stricmp(zKey, "pgsz") ){
+    int pgsz = 0;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      pgsz = sqlite3_value_int(pVal);
+    }
+    if( pgsz<32 || pgsz>FTS5_MAX_PAGE_SIZE ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->pgsz = pgsz;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "hashsize") ){
+    int nHashSize = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nHashSize = sqlite3_value_int(pVal);
+    }
+    if( nHashSize<=0 ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->nHashSize = nHashSize;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "automerge") ){
+    int nAutomerge = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nAutomerge = sqlite3_value_int(pVal);
+    }
+    if( nAutomerge<0 || nAutomerge>64 ){
+      *pbBadkey = 1;
+    }else{
+      if( nAutomerge==1 ) nAutomerge = FTS5_DEFAULT_AUTOMERGE;
+      pConfig->nAutomerge = nAutomerge;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "usermerge") ){
+    int nUsermerge = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nUsermerge = sqlite3_value_int(pVal);
+    }
+    if( nUsermerge<2 || nUsermerge>16 ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->nUsermerge = nUsermerge;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "crisismerge") ){
+    int nCrisisMerge = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nCrisisMerge = sqlite3_value_int(pVal);
+    }
+    if( nCrisisMerge<0 ){
+      *pbBadkey = 1;
+    }else{
+      if( nCrisisMerge<=1 ) nCrisisMerge = FTS5_DEFAULT_CRISISMERGE;
+      if( nCrisisMerge>=FTS5_MAX_SEGMENT ) nCrisisMerge = FTS5_MAX_SEGMENT-1;
+      pConfig->nCrisisMerge = nCrisisMerge;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "deletemerge") ){
+    int nVal = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nVal = sqlite3_value_int(pVal);
+    }else{
+      *pbBadkey = 1;
+    }
+    if( nVal<0 ) nVal = FTS5_DEFAULT_DELETE_AUTOMERGE;
+    if( nVal>100 ) nVal = 0;
+    pConfig->nDeleteMerge = nVal;
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "rank") ){
+    const char *zIn = (const char*)sqlite3_value_text(pVal);
+    char *zRank;
+    char *zRankArgs;
+    rc = sqlite3Fts5ConfigParseRank(zIn, &zRank, &zRankArgs);
+    if( rc==SQLITE_OK ){
+      sqlite3_free(pConfig->zRank);
+      sqlite3_free(pConfig->zRankArgs);
+      pConfig->zRank = zRank;
+      pConfig->zRankArgs = zRankArgs;
+    }else if( rc==SQLITE_ERROR ){
+      rc = SQLITE_OK;
+      *pbBadkey = 1;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "secure-delete") ){
+    int bVal = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      bVal = sqlite3_value_int(pVal);
+    }
+    if( bVal<0 ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->bSecureDelete = (bVal ? 1 : 0);
+    }
+  }else{
+    *pbBadkey = 1;
+  }
+  return rc;
+}
+
+/*
+** Load the contents of the %_config table into memory.
+*/
+static int sqlite3Fts5ConfigLoad(Fts5Config *pConfig, int iCookie){
+  const char *zSelect = "SELECT k, v FROM %Q.'%q_config'";
+  char *zSql;
+  sqlite3_stmt *p = 0;
+  int rc = SQLITE_OK;
+  int iVersion = 0;
+
+  /* Set default values */
+  pConfig->pgsz = FTS5_DEFAULT_PAGE_SIZE;
+  pConfig->nAutomerge = FTS5_DEFAULT_AUTOMERGE;
+  pConfig->nUsermerge = FTS5_DEFAULT_USERMERGE;
+  pConfig->nCrisisMerge = FTS5_DEFAULT_CRISISMERGE;
+  pConfig->nHashSize = FTS5_DEFAULT_HASHSIZE;
+  pConfig->nDeleteMerge = FTS5_DEFAULT_DELETE_AUTOMERGE;
+
+  zSql = sqlite3Fts5Mprintf(&rc, zSelect, pConfig->zDb, pConfig->zName);
+  if( zSql ){
+    rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &p, 0);
+    sqlite3_free(zSql);
+  }
+
+  assert( rc==SQLITE_OK || p==0 );
+  if( rc==SQLITE_OK ){
+    while( SQLITE_ROW==sqlite3_step(p) ){
+      const char *zK = (const char*)sqlite3_column_text(p, 0);
+      sqlite3_value *pVal = sqlite3_column_value(p, 1);
+      if( 0==sqlite3_stricmp(zK, "version") ){
+        iVersion = sqlite3_value_int(pVal);
+      }else{
+        int bDummy = 0;
+        sqlite3Fts5ConfigSetValue(pConfig, zK, pVal, &bDummy);
+      }
+    }
+    rc = sqlite3_finalize(p);
+  }
+  
+  if( rc==SQLITE_OK 
+   && iVersion!=FTS5_CURRENT_VERSION
+   && iVersion!=FTS5_CURRENT_VERSION_SECUREDELETE
+  ){
+    rc = SQLITE_ERROR;
+    if( pConfig->pzErrmsg ){
+      assert( 0==*pConfig->pzErrmsg );
+      *pConfig->pzErrmsg = sqlite3_mprintf("invalid fts5 file format "
+          "(found %d, expected %d or %d) - run 'rebuild'",
+          iVersion, FTS5_CURRENT_VERSION, FTS5_CURRENT_VERSION_SECUREDELETE
+      );
+    }
+  }else{
+    pConfig->iVersion = iVersion;
+  }
+
+  if( rc==SQLITE_OK ){
+    pConfig->iCookie = iCookie;
+  }
+  return rc;
+}
+
+#line 1 "fts5_expr.c"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+
+
+
+/* #include "fts5Int.h" */
+/* #include "fts5parse.h" */
+
+#ifndef SQLITE_FTS5_MAX_EXPR_DEPTH
+# define SQLITE_FTS5_MAX_EXPR_DEPTH 256
+#endif
+
+/*
+** All token types in the generated fts5parse.h file are greater than 0.
+*/
+#define FTS5_EOF 0
+
+#define FTS5_LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
+
+typedef struct Fts5ExprTerm Fts5ExprTerm;
+
+/*
+** Functions generated by lemon from fts5parse.y.
+*/
+static void *sqlite3Fts5ParserAlloc(void *(*mallocProc)(u64));
+static void sqlite3Fts5ParserFree(void*, void (*freeProc)(void*));
+static void sqlite3Fts5Parser(void*, int, Fts5Token, Fts5Parse*);
+#ifndef NDEBUG
+#include <stdio.h>
+static void sqlite3Fts5ParserTrace(FILE*, char*);
+#endif
+static int sqlite3Fts5ParserFallback(int);
+
+
+struct Fts5Expr {
+  Fts5Index *pIndex;
+  Fts5Config *pConfig;
+  Fts5ExprNode *pRoot;
+  int bDesc;                      /* Iterate in descending rowid order */
+  int nPhrase;                    /* Number of phrases in expression */
+  Fts5ExprPhrase **apExprPhrase;  /* Pointers to phrase objects */
+};
+
+/*
+** eType:
+**   Expression node type. Always one of:
+**
+**       FTS5_AND                 (nChild, apChild valid)
+**       FTS5_OR                  (nChild, apChild valid)
+**       FTS5_NOT                 (nChild, apChild valid)
+**       FTS5_STRING              (pNear valid)
+**       FTS5_TERM                (pNear valid)
+**
+** iHeight:
+**   Distance from this node to furthest leaf. This is always 0 for nodes
+**   of type FTS5_STRING and FTS5_TERM. For all other nodes it is one 
+**   greater than the largest child value.
+*/
+struct Fts5ExprNode {
+  int eType;                      /* Node type */
+  int bEof;                       /* True at EOF */
+  int bNomatch;                   /* True if entry is not a match */
+  int iHeight;                    /* Distance to tree leaf nodes */
+
+  /* Next method for this node. */
+  int (*xNext)(Fts5Expr*, Fts5ExprNode*, int, i64);
+
+  i64 iRowid;                     /* Current rowid */
+  Fts5ExprNearset *pNear;         /* For FTS5_STRING - cluster of phrases */
+
+  /* Child nodes. For a NOT node, this array always contains 2 entries. For 
+  ** AND or OR nodes, it contains 2 or more entries.  */
+  int nChild;                     /* Number of child nodes */
+  Fts5ExprNode *apChild[1];       /* Array of child nodes */
+};
+
+#define Fts5NodeIsString(p) ((p)->eType==FTS5_TERM || (p)->eType==FTS5_STRING)
+
+/*
+** Invoke the xNext method of an Fts5ExprNode object. This macro should be
+** used as if it has the same signature as the xNext() methods themselves.
+*/
+#define fts5ExprNodeNext(a,b,c,d) (b)->xNext((a), (b), (c), (d))
+
+/*
+** An instance of the following structure represents a single search term
+** or term prefix.
+*/
+struct Fts5ExprTerm {
+  u8 bPrefix;                     /* True for a prefix term */
+  u8 bFirst;                      /* True if token must be first in column */
+  char *pTerm;                    /* Term data */
+  int nQueryTerm;                 /* Effective size of term in bytes */
+  int nFullTerm;                  /* Size of term in bytes incl. tokendata */
+  Fts5IndexIter *pIter;           /* Iterator for this term */
+  Fts5ExprTerm *pSynonym;         /* Pointer to first in list of synonyms */
+};
+
+/*
+** A phrase. One or more terms that must appear in a contiguous sequence
+** within a document for it to match.
+*/
+struct Fts5ExprPhrase {
+  Fts5ExprNode *pNode;            /* FTS5_STRING node this phrase is part of */
+  Fts5Buffer poslist;             /* Current position list */
+  int nTerm;                      /* Number of entries in aTerm[] */
+  Fts5ExprTerm aTerm[1];          /* Terms that make up this phrase */
+};
+
+/*
+** One or more phrases that must appear within a certain token distance of
+** each other within each matching document.
+*/
+struct Fts5ExprNearset {
+  int nNear;                      /* NEAR parameter */
+  Fts5Colset *pColset;            /* Columns to search (NULL -> all columns) */
+  int nPhrase;                    /* Number of entries in aPhrase[] array */
+  Fts5ExprPhrase *apPhrase[1];    /* Array of phrase pointers */
+};
+
+
+/*
+** Parse context.
+*/
+struct Fts5Parse {
+  Fts5Config *pConfig;
+  char *zErr;
+  int rc;
+  int nPhrase;                    /* Size of apPhrase array */
+  Fts5ExprPhrase **apPhrase;      /* Array of all phrases */
+  Fts5ExprNode *pExpr;            /* Result of a successful parse */
+  int bPhraseToAnd;               /* Convert "a+b" to "a AND b" */
+};
+
+/*
+** Check that the Fts5ExprNode.iHeight variables are set correctly in
+** the expression tree passed as the only argument.
+*/
+#ifndef NDEBUG
+static void assert_expr_depth_ok(int rc, Fts5ExprNode *p){
+  if( rc==SQLITE_OK ){
+    if( p->eType==FTS5_TERM || p->eType==FTS5_STRING || p->eType==0 ){
+      assert( p->iHeight==0 );
+    }else{
+      int ii;
+      int iMaxChild = 0;
+      for(ii=0; ii<p->nChild; ii++){
+        Fts5ExprNode *pChild = p->apChild[ii];
+        iMaxChild = MAX(iMaxChild, pChild->iHeight);
+        assert_expr_depth_ok(SQLITE_OK, pChild);
+      }
+      assert( p->iHeight==iMaxChild+1 );
+    }
+  }
+}
+#else
+# define assert_expr_depth_ok(rc, p)
+#endif
+
+static void sqlite3Fts5ParseError(Fts5Parse *pParse, const char *zFmt, ...){
+  va_list ap;
+  va_start(ap, zFmt);
+  if( pParse->rc==SQLITE_OK ){
+    assert( pParse->zErr==0 );
+    pParse->zErr = sqlite3_vmprintf(zFmt, ap);
+    pParse->rc = SQLITE_ERROR;
+  }
+  va_end(ap);
+}
+
+static int fts5ExprIsspace(char t){
+  return t==' ' || t=='\t' || t=='\n' || t=='\r';
+}
+
+/*
+** Read the first token from the nul-terminated string at *pz.
+*/
+static int fts5ExprGetToken(
+  Fts5Parse *pParse, 
+  const char **pz,                /* IN/OUT: Pointer into buffer */
+  Fts5Token *pToken
+){
+  const char *z = *pz;
+  int tok;
+
+  /* Skip past any whitespace */
+  while( fts5ExprIsspace(*z) ) z++;
+
+  pToken->p = z;
+  pToken->n = 1;
+  switch( *z ){
+    case '(':  tok = FTS5_LP;    break;
+    case ')':  tok = FTS5_RP;    break;
+    case '{':  tok = FTS5_LCP;   break;
+    case '}':  tok = FTS5_RCP;   break;
+    case ':':  tok = FTS5_COLON; break;
+    case ',':  tok = FTS5_COMMA; break;
+    case '+':  tok = FTS5_PLUS;  break;
+    case '*':  tok = FTS5_STAR;  break;
+    case '-':  tok = FTS5_MINUS; break;
+    case '^':  tok = FTS5_CARET; break;
+    case '\0': tok = FTS5_EOF;   break;
+
+    case '"': {
+      const char *z2;
+      tok = FTS5_STRING;
+
+      for(z2=&z[1]; 1; z2++){
+        if( z2[0]=='"' ){
+          z2++;
+          if( z2[0]!='"' ) break;
+        }
+        if( z2[0]=='\0' ){
+          sqlite3Fts5ParseError(pParse, "unterminated string");
+          return FTS5_EOF;
+        }
+      }
+      pToken->n = (z2 - z);
+      break;
+    }
+
+    default: {
+      const char *z2;
+      if( sqlite3Fts5IsBareword(z[0])==0 ){
+        sqlite3Fts5ParseError(pParse, "fts5: syntax error near \"%.1s\"", z);
+        return FTS5_EOF;
+      }
+      tok = FTS5_STRING;
+      for(z2=&z[1]; sqlite3Fts5IsBareword(*z2); z2++);
+      pToken->n = (z2 - z);
+      if( pToken->n==2 && memcmp(pToken->p, "OR", 2)==0 )  tok = FTS5_OR;
+      if( pToken->n==3 && memcmp(pToken->p, "NOT", 3)==0 ) tok = FTS5_NOT;
+      if( pToken->n==3 && memcmp(pToken->p, "AND", 3)==0 ) tok = FTS5_AND;
+      break;
+    }
+  }
+
+  *pz = &pToken->p[pToken->n];
+  return tok;
+}
+
+static void *fts5ParseAlloc(u64 t){ return sqlite3_malloc64((sqlite3_int64)t);}
+static void fts5ParseFree(void *p){ sqlite3_free(p); }
+
+static int sqlite3Fts5ExprNew(
+  Fts5Config *pConfig,            /* FTS5 Configuration */
+  int bPhraseToAnd,
+  int iCol,
+  const char *zExpr,              /* Expression text */
+  Fts5Expr **ppNew, 
+  char **pzErr
+){
+  Fts5Parse sParse;
+  Fts5Token token;
+  const char *z = zExpr;
+  int t;                          /* Next token type */
+  void *pEngine;
+  Fts5Expr *pNew;
+
+  *ppNew = 0;
+  *pzErr = 0;
+  memset(&sParse, 0, sizeof(sParse));
+  sParse.bPhraseToAnd = bPhraseToAnd;
+  pEngine = sqlite3Fts5ParserAlloc(fts5ParseAlloc);
+  if( pEngine==0 ){ return SQLITE_NOMEM; }
+  sParse.pConfig = pConfig;
+
+  do {
+    t = fts5ExprGetToken(&sParse, &z, &token);
+    sqlite3Fts5Parser(pEngine, t, token, &sParse);
+  }while( sParse.rc==SQLITE_OK && t!=FTS5_EOF );
+  sqlite3Fts5ParserFree(pEngine, fts5ParseFree);
+
+  assert_expr_depth_ok(sParse.rc, sParse.pExpr);
+
+  /* If the LHS of the MATCH expression was a user column, apply the
+  ** implicit column-filter.  */
+  if( iCol<pConfig->nCol && sParse.pExpr && sParse.rc==SQLITE_OK ){
+    int n = sizeof(Fts5Colset);
+    Fts5Colset *pColset = (Fts5Colset*)sqlite3Fts5MallocZero(&sParse.rc, n);
+    if( pColset ){
+      pColset->nCol = 1;
+      pColset->aiCol[0] = iCol;
+      sqlite3Fts5ParseSetColset(&sParse, sParse.pExpr, pColset);
+    }
+  }
+
+  assert( sParse.rc!=SQLITE_OK || sParse.zErr==0 );
+  if( sParse.rc==SQLITE_OK ){
+    *ppNew = pNew = sqlite3_malloc(sizeof(Fts5Expr));
+    if( pNew==0 ){
+      sParse.rc = SQLITE_NOMEM;
+      sqlite3Fts5ParseNodeFree(sParse.pExpr);
+    }else{
+      if( !sParse.pExpr ){
+        const int nByte = sizeof(Fts5ExprNode);
+        pNew->pRoot = (Fts5ExprNode*)sqlite3Fts5MallocZero(&sParse.rc, nByte);
+        if( pNew->pRoot ){
+          pNew->pRoot->bEof = 1;
+        }
+      }else{
+        pNew->pRoot = sParse.pExpr;
+      }
+      pNew->pIndex = 0;
+      pNew->pConfig = pConfig;
+      pNew->apExprPhrase = sParse.apPhrase;
+      pNew->nPhrase = sParse.nPhrase;
+      pNew->bDesc = 0;
+      sParse.apPhrase = 0;
+    }
+  }else{
+    sqlite3Fts5ParseNodeFree(sParse.pExpr);
+  }
+
+  sqlite3_free(sParse.apPhrase);
+  *pzErr = sParse.zErr;
+  return sParse.rc;
+}
+
+/*
+** Assuming that buffer z is at least nByte bytes in size and contains a
+** valid utf-8 string, return the number of characters in the string.
+*/
+static int fts5ExprCountChar(const char *z, int nByte){
+  int nRet = 0;
+  int ii;
+  for(ii=0; ii<nByte; ii++){
+    if( (z[ii] & 0xC0)!=0x80 ) nRet++;
+  }
+  return nRet;
+}
+
+/*
+** This function is only called when using the special 'trigram' tokenizer.
+** Argument zText contains the text of a LIKE or GLOB pattern matched
+** against column iCol. This function creates and compiles an FTS5 MATCH
+** expression that will match a superset of the rows matched by the LIKE or
+** GLOB. If successful, SQLITE_OK is returned. Otherwise, an SQLite error
+** code.
+*/
+static int sqlite3Fts5ExprPattern(
+  Fts5Config *pConfig, int bGlob, int iCol, const char *zText, Fts5Expr **pp
+){
+  i64 nText = strlen(zText);
+  char *zExpr = (char*)sqlite3_malloc64(nText*4 + 1);
+  int rc = SQLITE_OK;
+
+  if( zExpr==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    char aSpec[3];
+    int iOut = 0;
+    int i = 0;
+    int iFirst = 0;
+
+    if( bGlob==0 ){
+      aSpec[0] = '_';
+      aSpec[1] = '%';
+      aSpec[2] = 0;
+    }else{
+      aSpec[0] = '*';
+      aSpec[1] = '?';
+      aSpec[2] = '[';
+    }
+
+    while( i<=nText ){
+      if( i==nText 
+       || zText[i]==aSpec[0] || zText[i]==aSpec[1] || zText[i]==aSpec[2] 
+      ){
+
+        if( fts5ExprCountChar(&zText[iFirst], i-iFirst)>=3 ){
+          int jj;
+          zExpr[iOut++] = '"';
+          for(jj=iFirst; jj<i; jj++){
+            zExpr[iOut++] = zText[jj];
+            if( zText[jj]=='"' ) zExpr[iOut++] = '"';
+          }
+          zExpr[iOut++] = '"';
+          zExpr[iOut++] = ' ';
+        }
+        if( zText[i]==aSpec[2] ){
+          i += 2;
+          if( zText[i-1]=='^' ) i++;
+          while( i<nText && zText[i]!=']' ) i++;
+        }
+        iFirst = i+1;
+      }
+      i++;
+    }
+    if( iOut>0 ){
+      int bAnd = 0;
+      if( pConfig->eDetail!=FTS5_DETAIL_FULL ){
+        bAnd = 1;
+        if( pConfig->eDetail==FTS5_DETAIL_NONE ){
+          iCol = pConfig->nCol;
+        }
+      }
+      zExpr[iOut] = '\0';
+      rc = sqlite3Fts5ExprNew(pConfig, bAnd, iCol, zExpr, pp,pConfig->pzErrmsg);
+    }else{
+      *pp = 0;
+    }
+    sqlite3_free(zExpr);
+  }
+
+  return rc;
+}
+
+/*
+** Free the expression node object passed as the only argument.
+*/
+static void sqlite3Fts5ParseNodeFree(Fts5ExprNode *p){
+  if( p ){
+    int i;
+    for(i=0; i<p->nChild; i++){
+      sqlite3Fts5ParseNodeFree(p->apChild[i]);
+    }
+    sqlite3Fts5ParseNearsetFree(p->pNear);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Free the expression object passed as the only argument.
+*/
+static void sqlite3Fts5ExprFree(Fts5Expr *p){
+  if( p ){
+    sqlite3Fts5ParseNodeFree(p->pRoot);
+    sqlite3_free(p->apExprPhrase);
+    sqlite3_free(p);
+  }
+}
+
+static int sqlite3Fts5ExprAnd(Fts5Expr **pp1, Fts5Expr *p2){
+  Fts5Parse sParse;
+  memset(&sParse, 0, sizeof(sParse));
+
+  if( *pp1 && p2 ){
+    Fts5Expr *p1 = *pp1;
+    int nPhrase = p1->nPhrase + p2->nPhrase;
+
+    p1->pRoot = sqlite3Fts5ParseNode(&sParse, FTS5_AND, p1->pRoot, p2->pRoot,0);
+    p2->pRoot = 0;
+
+    if( sParse.rc==SQLITE_OK ){
+      Fts5ExprPhrase **ap = (Fts5ExprPhrase**)sqlite3_realloc(
+          p1->apExprPhrase, nPhrase * sizeof(Fts5ExprPhrase*)
+      );
+      if( ap==0 ){
+        sParse.rc = SQLITE_NOMEM;
+      }else{
+        int i;
+        memmove(&ap[p2->nPhrase], ap, p1->nPhrase*sizeof(Fts5ExprPhrase*));
+        for(i=0; i<p2->nPhrase; i++){
+          ap[i] = p2->apExprPhrase[i];
+        }
+        p1->nPhrase = nPhrase;
+        p1->apExprPhrase = ap;
+      }
+    }
+    sqlite3_free(p2->apExprPhrase);
+    sqlite3_free(p2);
+  }else if( p2 ){
+    *pp1 = p2;
+  }
+
+  return sParse.rc;
+}
+
+/*
+** Argument pTerm must be a synonym iterator. Return the current rowid
+** that it points to.
+*/
+static i64 fts5ExprSynonymRowid(Fts5ExprTerm *pTerm, int bDesc, int *pbEof){
+  i64 iRet = 0;
+  int bRetValid = 0;
+  Fts5ExprTerm *p;
+
+  assert( pTerm );
+  assert( pTerm->pSynonym );
+  assert( bDesc==0 || bDesc==1 );
+  for(p=pTerm; p; p=p->pSynonym){
+    if( 0==sqlite3Fts5IterEof(p->pIter) ){
+      i64 iRowid = p->pIter->iRowid;
+      if( bRetValid==0 || (bDesc!=(iRowid<iRet)) ){
+        iRet = iRowid;
+        bRetValid = 1;
+      }
+    }
+  }
+
+  if( pbEof && bRetValid==0 ) *pbEof = 1;
+  return iRet;
+}
+
+/*
+** Argument pTerm must be a synonym iterator.
+*/
+static int fts5ExprSynonymList(
+  Fts5ExprTerm *pTerm, 
+  i64 iRowid,
+  Fts5Buffer *pBuf,               /* Use this buffer for space if required */
+  u8 **pa, int *pn
+){
+  Fts5PoslistReader aStatic[4];
+  Fts5PoslistReader *aIter = aStatic;
+  int nIter = 0;
+  int nAlloc = 4;
+  int rc = SQLITE_OK;
+  Fts5ExprTerm *p;
+
+  assert( pTerm->pSynonym );
+  for(p=pTerm; p; p=p->pSynonym){
+    Fts5IndexIter *pIter = p->pIter;
+    if( sqlite3Fts5IterEof(pIter)==0 && pIter->iRowid==iRowid ){
+      if( pIter->nData==0 ) continue;
+      if( nIter==nAlloc ){
+        sqlite3_int64 nByte = sizeof(Fts5PoslistReader) * nAlloc * 2;
+        Fts5PoslistReader *aNew = (Fts5PoslistReader*)sqlite3_malloc64(nByte);
+        if( aNew==0 ){
+          rc = SQLITE_NOMEM;
+          goto synonym_poslist_out;
+        }
+        memcpy(aNew, aIter, sizeof(Fts5PoslistReader) * nIter);
+        nAlloc = nAlloc*2;
+        if( aIter!=aStatic ) sqlite3_free(aIter);
+        aIter = aNew;
+      }
+      sqlite3Fts5PoslistReaderInit(pIter->pData, pIter->nData, &aIter[nIter]);
+      assert( aIter[nIter].bEof==0 );
+      nIter++;
+    }
+  }
+
+  if( nIter==1 ){
+    *pa = (u8*)aIter[0].a;
+    *pn = aIter[0].n;
+  }else{
+    Fts5PoslistWriter writer = {0};
+    i64 iPrev = -1;
+    fts5BufferZero(pBuf);
+    while( 1 ){
+      int i;
+      i64 iMin = FTS5_LARGEST_INT64;
+      for(i=0; i<nIter; i++){
+        if( aIter[i].bEof==0 ){
+          if( aIter[i].iPos==iPrev ){
+            if( sqlite3Fts5PoslistReaderNext(&aIter[i]) ) continue;
+          }
+          if( aIter[i].iPos<iMin ){
+            iMin = aIter[i].iPos;
+          }
+        }
+      }
+      if( iMin==FTS5_LARGEST_INT64 || rc!=SQLITE_OK ) break;
+      rc = sqlite3Fts5PoslistWriterAppend(pBuf, &writer, iMin);
+      iPrev = iMin;
+    }
+    if( rc==SQLITE_OK ){
+      *pa = pBuf->p;
+      *pn = pBuf->n;
+    }
+  }
+
+ synonym_poslist_out:
+  if( aIter!=aStatic ) sqlite3_free(aIter);
+  return rc;
+}
+
+
+/*
+** All individual term iterators in pPhrase are guaranteed to be valid and
+** pointing to the same rowid when this function is called. This function 
+** checks if the current rowid really is a match, and if so populates
+** the pPhrase->poslist buffer accordingly. Output parameter *pbMatch
+** is set to true if this is really a match, or false otherwise.
+**
+** SQLITE_OK is returned if an error occurs, or an SQLite error code 
+** otherwise. It is not considered an error code if the current rowid is 
+** not a match.
+*/
+static int fts5ExprPhraseIsMatch(
+  Fts5ExprNode *pNode,            /* Node pPhrase belongs to */
+  Fts5ExprPhrase *pPhrase,        /* Phrase object to initialize */
+  int *pbMatch                    /* OUT: Set to true if really a match */
+){
+  Fts5PoslistWriter writer = {0};
+  Fts5PoslistReader aStatic[4];
+  Fts5PoslistReader *aIter = aStatic;
+  int i;
+  int rc = SQLITE_OK;
+  int bFirst = pPhrase->aTerm[0].bFirst;
+  
+  fts5BufferZero(&pPhrase->poslist);
+
+  /* If the aStatic[] array is not large enough, allocate a large array
+  ** using sqlite3_malloc(). This approach could be improved upon. */
+  if( pPhrase->nTerm>ArraySize(aStatic) ){
+    sqlite3_int64 nByte = sizeof(Fts5PoslistReader) * pPhrase->nTerm;
+    aIter = (Fts5PoslistReader*)sqlite3_malloc64(nByte);
+    if( !aIter ) return SQLITE_NOMEM;
+  }
+  memset(aIter, 0, sizeof(Fts5PoslistReader) * pPhrase->nTerm);
+
+  /* Initialize a term iterator for each term in the phrase */
+  for(i=0; i<pPhrase->nTerm; i++){
+    Fts5ExprTerm *pTerm = &pPhrase->aTerm[i];
+    int n = 0;
+    int bFlag = 0;
+    u8 *a = 0;
+    if( pTerm->pSynonym ){
+      Fts5Buffer buf = {0, 0, 0};
+      rc = fts5ExprSynonymList(pTerm, pNode->iRowid, &buf, &a, &n);
+      if( rc ){
+        sqlite3_free(a);
+        goto ismatch_out;
+      }
+      if( a==buf.p ) bFlag = 1;
+    }else{
+      a = (u8*)pTerm->pIter->pData;
+      n = pTerm->pIter->nData;
+    }
+    sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);
+    aIter[i].bFlag = (u8)bFlag;
+    if( aIter[i].bEof ) goto ismatch_out;
+  }
+
+  while( 1 ){
+    int bMatch;
+    i64 iPos = aIter[0].iPos;
+    do {
+      bMatch = 1;
+      for(i=0; i<pPhrase->nTerm; i++){
+        Fts5PoslistReader *pPos = &aIter[i];
+        i64 iAdj = iPos + i;
+        if( pPos->iPos!=iAdj ){
+          bMatch = 0;
+          while( pPos->iPos<iAdj ){
+            if( sqlite3Fts5PoslistReaderNext(pPos) ) goto ismatch_out;
+          }
+          if( pPos->iPos>iAdj ) iPos = pPos->iPos-i;
+        }
+      }
+    }while( bMatch==0 );
+
+    /* Append position iPos to the output */
+    if( bFirst==0 || FTS5_POS2OFFSET(iPos)==0 ){
+      rc = sqlite3Fts5PoslistWriterAppend(&pPhrase->poslist, &writer, iPos);
+      if( rc!=SQLITE_OK ) goto ismatch_out;
+    }
+
+    for(i=0; i<pPhrase->nTerm; i++){
+      if( sqlite3Fts5PoslistReaderNext(&aIter[i]) ) goto ismatch_out;
+    }
+  }
+
+ ismatch_out:
+  *pbMatch = (pPhrase->poslist.n>0);
+  for(i=0; i<pPhrase->nTerm; i++){
+    if( aIter[i].bFlag ) sqlite3_free((u8*)aIter[i].a);
+  }
+  if( aIter!=aStatic ) sqlite3_free(aIter);
+  return rc;
+}
+
+typedef struct Fts5LookaheadReader Fts5LookaheadReader;
+struct Fts5LookaheadReader {
+  const u8 *a;                    /* Buffer containing position list */
+  int n;                          /* Size of buffer a[] in bytes */
+  int i;                          /* Current offset in position list */
+  i64 iPos;                       /* Current position */
+  i64 iLookahead;                 /* Next position */
+};
+
+#define FTS5_LOOKAHEAD_EOF (((i64)1) << 62)
+
+static int fts5LookaheadReaderNext(Fts5LookaheadReader *p){
+  p->iPos = p->iLookahead;
+  if( sqlite3Fts5PoslistNext64(p->a, p->n, &p->i, &p->iLookahead) ){
+    p->iLookahead = FTS5_LOOKAHEAD_EOF;
+  }
+  return (p->iPos==FTS5_LOOKAHEAD_EOF);
+}
+
+static int fts5LookaheadReaderInit(
+  const u8 *a, int n,             /* Buffer to read position list from */
+  Fts5LookaheadReader *p          /* Iterator object to initialize */
+){
+  memset(p, 0, sizeof(Fts5LookaheadReader));
+  p->a = a;
+  p->n = n;
+  fts5LookaheadReaderNext(p);
+  return fts5LookaheadReaderNext(p);
+}
+
+typedef struct Fts5NearTrimmer Fts5NearTrimmer;
+struct Fts5NearTrimmer {
+  Fts5LookaheadReader reader;     /* Input iterator */
+  Fts5PoslistWriter writer;       /* Writer context */
+  Fts5Buffer *pOut;               /* Output poslist */
+};
+
+/*
+** The near-set object passed as the first argument contains more than
+** one phrase. All phrases currently point to the same row. The
+** Fts5ExprPhrase.poslist buffers are populated accordingly. This function
+** tests if the current row contains instances of each phrase sufficiently
+** close together to meet the NEAR constraint. Non-zero is returned if it
+** does, or zero otherwise.
+**
+** If in/out parameter (*pRc) is set to other than SQLITE_OK when this
+** function is called, it is a no-op. Or, if an error (e.g. SQLITE_NOMEM)
+** occurs within this function (*pRc) is set accordingly before returning.
+** The return value is undefined in both these cases.
+** 
+** If no error occurs and non-zero (a match) is returned, the position-list
+** of each phrase object is edited to contain only those entries that
+** meet the constraint before returning.
+*/
+static int fts5ExprNearIsMatch(int *pRc, Fts5ExprNearset *pNear){
+  Fts5NearTrimmer aStatic[4];
+  Fts5NearTrimmer *a = aStatic;
+  Fts5ExprPhrase **apPhrase = pNear->apPhrase;
+
+  int i;
+  int rc = *pRc;
+  int bMatch;
+
+  assert( pNear->nPhrase>1 );
+
+  /* If the aStatic[] array is not large enough, allocate a large array
+  ** using sqlite3_malloc(). This approach could be improved upon. */
+  if( pNear->nPhrase>ArraySize(aStatic) ){
+    sqlite3_int64 nByte = sizeof(Fts5NearTrimmer) * pNear->nPhrase;
+    a = (Fts5NearTrimmer*)sqlite3Fts5MallocZero(&rc, nByte);
+  }else{
+    memset(aStatic, 0, sizeof(aStatic));
+  }
+  if( rc!=SQLITE_OK ){
+    *pRc = rc;
+    return 0;
+  }
+
+  /* Initialize a lookahead iterator for each phrase. After passing the
+  ** buffer and buffer size to the lookaside-reader init function, zero
+  ** the phrase poslist buffer. The new poslist for the phrase (containing
+  ** the same entries as the original with some entries removed on account 
+  ** of the NEAR constraint) is written over the original even as it is
+  ** being read. This is safe as the entries for the new poslist are a
+  ** subset of the old, so it is not possible for data yet to be read to
+  ** be overwritten.  */
+  for(i=0; i<pNear->nPhrase; i++){
+    Fts5Buffer *pPoslist = &apPhrase[i]->poslist;
+    fts5LookaheadReaderInit(pPoslist->p, pPoslist->n, &a[i].reader);
+    pPoslist->n = 0;
+    a[i].pOut = pPoslist;
+  }
+
+  while( 1 ){
+    int iAdv;
+    i64 iMin;
+    i64 iMax;
+
+    /* This block advances the phrase iterators until they point to a set of
+    ** entries that together comprise a match.  */
+    iMax = a[0].reader.iPos;
+    do {
+      bMatch = 1;
+      for(i=0; i<pNear->nPhrase; i++){
+        Fts5LookaheadReader *pPos = &a[i].reader;
+        iMin = iMax - pNear->apPhrase[i]->nTerm - pNear->nNear;
+        if( pPos->iPos<iMin || pPos->iPos>iMax ){
+          bMatch = 0;
+          while( pPos->iPos<iMin ){
+            if( fts5LookaheadReaderNext(pPos) ) goto ismatch_out;
+          }
+          if( pPos->iPos>iMax ) iMax = pPos->iPos;
+        }
+      }
+    }while( bMatch==0 );
+
+    /* Add an entry to each output position list */
+    for(i=0; i<pNear->nPhrase; i++){
+      i64 iPos = a[i].reader.iPos;
+      Fts5PoslistWriter *pWriter = &a[i].writer;
+      if( a[i].pOut->n==0 || iPos!=pWriter->iPrev ){
+        sqlite3Fts5PoslistWriterAppend(a[i].pOut, pWriter, iPos);
+      }
+    }
+
+    iAdv = 0;
+    iMin = a[0].reader.iLookahead;
+    for(i=0; i<pNear->nPhrase; i++){
+      if( a[i].reader.iLookahead < iMin ){
+        iMin = a[i].reader.iLookahead;
+        iAdv = i;
+      }
+    }
+    if( fts5LookaheadReaderNext(&a[iAdv].reader) ) goto ismatch_out;
+  }
+
+  ismatch_out: {
+    int bRet = a[0].pOut->n>0;
+    *pRc = rc;
+    if( a!=aStatic ) sqlite3_free(a);
+    return bRet;
+  }
+}
+
+/*
+** Advance iterator pIter until it points to a value equal to or laster
+** than the initial value of *piLast. If this means the iterator points
+** to a value laster than *piLast, update *piLast to the new lastest value.
+**
+** If the iterator reaches EOF, set *pbEof to true before returning. If
+** an error occurs, set *pRc to an error code. If either *pbEof or *pRc
+** are set, return a non-zero value. Otherwise, return zero.
+*/
+static int fts5ExprAdvanceto(
+  Fts5IndexIter *pIter,           /* Iterator to advance */
+  int bDesc,                      /* True if iterator is "rowid DESC" */
+  i64 *piLast,                    /* IN/OUT: Lastest rowid seen so far */
+  int *pRc,                       /* OUT: Error code */
+  int *pbEof                      /* OUT: Set to true if EOF */
+){
+  i64 iLast = *piLast;
+  i64 iRowid;
+
+  iRowid = pIter->iRowid;
+  if( (bDesc==0 && iLast>iRowid) || (bDesc && iLast<iRowid) ){
+    int rc = sqlite3Fts5IterNextFrom(pIter, iLast);
+    if( rc || sqlite3Fts5IterEof(pIter) ){
+      *pRc = rc;
+      *pbEof = 1;
+      return 1;
+    }
+    iRowid = pIter->iRowid;
+    assert( (bDesc==0 && iRowid>=iLast) || (bDesc==1 && iRowid<=iLast) );
+  }
+  *piLast = iRowid;
+
+  return 0;
+}
+
+static int fts5ExprSynonymAdvanceto(
+  Fts5ExprTerm *pTerm,            /* Term iterator to advance */
+  int bDesc,                      /* True if iterator is "rowid DESC" */
+  i64 *piLast,                    /* IN/OUT: Lastest rowid seen so far */
+  int *pRc                        /* OUT: Error code */
+){
+  int rc = SQLITE_OK;
+  i64 iLast = *piLast;
+  Fts5ExprTerm *p;
+  int bEof = 0;
+
+  for(p=pTerm; rc==SQLITE_OK && p; p=p->pSynonym){
+    if( sqlite3Fts5IterEof(p->pIter)==0 ){
+      i64 iRowid = p->pIter->iRowid;
+      if( (bDesc==0 && iLast>iRowid) || (bDesc && iLast<iRowid) ){
+        rc = sqlite3Fts5IterNextFrom(p->pIter, iLast);
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    *pRc = rc;
+    bEof = 1;
+  }else{
+    *piLast = fts5ExprSynonymRowid(pTerm, bDesc, &bEof);
+  }
+  return bEof;
+}
+
+
+static int fts5ExprNearTest(
+  int *pRc,
+  Fts5Expr *pExpr,                /* Expression that pNear is a part of */
+  Fts5ExprNode *pNode             /* The "NEAR" node (FTS5_STRING) */
+){
+  Fts5ExprNearset *pNear = pNode->pNear;
+  int rc = *pRc;
+
+  if( pExpr->pConfig->eDetail!=FTS5_DETAIL_FULL ){
+    Fts5ExprTerm *pTerm;
+    Fts5ExprPhrase *pPhrase = pNear->apPhrase[0];
+    pPhrase->poslist.n = 0;
+    for(pTerm=&pPhrase->aTerm[0]; pTerm; pTerm=pTerm->pSynonym){
+      Fts5IndexIter *pIter = pTerm->pIter;
+      if( sqlite3Fts5IterEof(pIter)==0 ){
+        if( pIter->iRowid==pNode->iRowid && pIter->nData>0 ){
+          pPhrase->poslist.n = 1;
+        }
+      }
+    }
+    return pPhrase->poslist.n;
+  }else{
+    int i;
+
+    /* Check that each phrase in the nearset matches the current row.
+    ** Populate the pPhrase->poslist buffers at the same time. If any
+    ** phrase is not a match, break out of the loop early.  */
+    for(i=0; rc==SQLITE_OK && i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      if( pPhrase->nTerm>1 || pPhrase->aTerm[0].pSynonym 
+       || pNear->pColset || pPhrase->aTerm[0].bFirst
+      ){
+        int bMatch = 0;
+        rc = fts5ExprPhraseIsMatch(pNode, pPhrase, &bMatch);
+        if( bMatch==0 ) break;
+      }else{
+        Fts5IndexIter *pIter = pPhrase->aTerm[0].pIter;
+        fts5BufferSet(&rc, &pPhrase->poslist, pIter->nData, pIter->pData);
+      }
+    }
+
+    *pRc = rc;
+    if( i==pNear->nPhrase && (i==1 || fts5ExprNearIsMatch(pRc, pNear)) ){
+      return 1;
+    }
+    return 0;
+  }
+}
+
+
+/*
+** Initialize all term iterators in the pNear object. If any term is found
+** to match no documents at all, return immediately without initializing any
+** further iterators.
+**
+** If an error occurs, return an SQLite error code. Otherwise, return
+** SQLITE_OK. It is not considered an error if some term matches zero
+** documents.
+*/
+static int fts5ExprNearInitAll(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *pNode
+){
+  Fts5ExprNearset *pNear = pNode->pNear;
+  int i;
+
+  assert( pNode->bNomatch==0 );
+  for(i=0; i<pNear->nPhrase; i++){
+    Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+    if( pPhrase->nTerm==0 ){
+      pNode->bEof = 1;
+      return SQLITE_OK;
+    }else{
+      int j;
+      for(j=0; j<pPhrase->nTerm; j++){
+        Fts5ExprTerm *pTerm = &pPhrase->aTerm[j];
+        Fts5ExprTerm *p;
+        int bHit = 0;
+
+        for(p=pTerm; p; p=p->pSynonym){
+          int rc;
+          if( p->pIter ){
+            sqlite3Fts5IterClose(p->pIter);
+            p->pIter = 0;
+          }
+          rc = sqlite3Fts5IndexQuery(
+              pExpr->pIndex, p->pTerm, p->nQueryTerm,
+              (pTerm->bPrefix ? FTS5INDEX_QUERY_PREFIX : 0) |
+              (pExpr->bDesc ? FTS5INDEX_QUERY_DESC : 0),
+              pNear->pColset,
+              &p->pIter
+          );
+          assert( (rc==SQLITE_OK)==(p->pIter!=0) );
+          if( rc!=SQLITE_OK ) return rc;
+          if( 0==sqlite3Fts5IterEof(p->pIter) ){
+            bHit = 1;
+          }
+        }
+
+        if( bHit==0 ){
+          pNode->bEof = 1;
+          return SQLITE_OK;
+        }
+      }
+    }
+  }
+
+  pNode->bEof = 0;
+  return SQLITE_OK;
+}
+
+/*
+** If pExpr is an ASC iterator, this function returns a value with the
+** same sign as:
+**
+**   (iLhs - iRhs)
+**
+** Otherwise, if this is a DESC iterator, the opposite is returned:
+**
+**   (iRhs - iLhs)
+*/
+static int fts5RowidCmp(
+  Fts5Expr *pExpr,
+  i64 iLhs,
+  i64 iRhs
+){
+  assert( pExpr->bDesc==0 || pExpr->bDesc==1 );
+  if( pExpr->bDesc==0 ){
+    if( iLhs<iRhs ) return -1;
+    return (iLhs > iRhs);
+  }else{
+    if( iLhs>iRhs ) return -1;
+    return (iLhs < iRhs);
+  }
+}
+
+static void fts5ExprSetEof(Fts5ExprNode *pNode){
+  int i;
+  pNode->bEof = 1;
+  pNode->bNomatch = 0;
+  for(i=0; i<pNode->nChild; i++){
+    fts5ExprSetEof(pNode->apChild[i]);
+  }
+}
+
+static void fts5ExprNodeZeroPoslist(Fts5ExprNode *pNode){
+  if( pNode->eType==FTS5_STRING || pNode->eType==FTS5_TERM ){
+    Fts5ExprNearset *pNear = pNode->pNear;
+    int i;
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      pPhrase->poslist.n = 0;
+    }
+  }else{
+    int i;
+    for(i=0; i<pNode->nChild; i++){
+      fts5ExprNodeZeroPoslist(pNode->apChild[i]);
+    }
+  }
+}
+
+
+
+/*
+** Compare the values currently indicated by the two nodes as follows:
+**
+**    res = (*p1) - (*p2)
+**
+** Nodes that point to values that come later in the iteration order are
+** considered to be larger. Nodes at EOF are the largest of all.
+**
+** This means that if the iteration order is ASC, then numerically larger
+** rowids are considered larger. Or if it is the default DESC, numerically
+** smaller rowids are larger.
+*/
+static int fts5NodeCompare(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *p1, 
+  Fts5ExprNode *p2
+){
+  if( p2->bEof ) return -1;
+  if( p1->bEof ) return +1;
+  return fts5RowidCmp(pExpr, p1->iRowid, p2->iRowid);
+}
+
+/*
+** All individual term iterators in pNear are guaranteed to be valid when
+** this function is called. This function checks if all term iterators
+** point to the same rowid, and if not, advances them until they do.
+** If an EOF is reached before this happens, *pbEof is set to true before
+** returning.
+**
+** SQLITE_OK is returned if an error occurs, or an SQLite error code 
+** otherwise. It is not considered an error code if an iterator reaches
+** EOF.
+*/
+static int fts5ExprNodeTest_STRING(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pNode
+){
+  Fts5ExprNearset *pNear = pNode->pNear;
+  Fts5ExprPhrase *pLeft = pNear->apPhrase[0];
+  int rc = SQLITE_OK;
+  i64 iLast;                      /* Lastest rowid any iterator points to */
+  int i, j;                       /* Phrase and token index, respectively */
+  int bMatch;                     /* True if all terms are at the same rowid */
+  const int bDesc = pExpr->bDesc;
+
+  /* Check that this node should not be FTS5_TERM */
+  assert( pNear->nPhrase>1 
+       || pNear->apPhrase[0]->nTerm>1 
+       || pNear->apPhrase[0]->aTerm[0].pSynonym
+       || pNear->apPhrase[0]->aTerm[0].bFirst
+  );
+
+  /* Initialize iLast, the "lastest" rowid any iterator points to. If the
+  ** iterator skips through rowids in the default ascending order, this means
+  ** the maximum rowid. Or, if the iterator is "ORDER BY rowid DESC", then it
+  ** means the minimum rowid.  */
+  if( pLeft->aTerm[0].pSynonym ){
+    iLast = fts5ExprSynonymRowid(&pLeft->aTerm[0], bDesc, 0);
+  }else{
+    iLast = pLeft->aTerm[0].pIter->iRowid;
+  }
+
+  do {
+    bMatch = 1;
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      for(j=0; j<pPhrase->nTerm; j++){
+        Fts5ExprTerm *pTerm = &pPhrase->aTerm[j];
+        if( pTerm->pSynonym ){
+          i64 iRowid = fts5ExprSynonymRowid(pTerm, bDesc, 0);
+          if( iRowid==iLast ) continue;
+          bMatch = 0;
+          if( fts5ExprSynonymAdvanceto(pTerm, bDesc, &iLast, &rc) ){
+            pNode->bNomatch = 0;
+            pNode->bEof = 1;
+            return rc;
+          }
+        }else{
+          Fts5IndexIter *pIter = pPhrase->aTerm[j].pIter;
+          if( pIter->iRowid==iLast || pIter->bEof ) continue;
+          bMatch = 0;
+          if( fts5ExprAdvanceto(pIter, bDesc, &iLast, &rc, &pNode->bEof) ){
+            return rc;
+          }
+        }
+      }
+    }
+  }while( bMatch==0 );
+
+  pNode->iRowid = iLast;
+  pNode->bNomatch = ((0==fts5ExprNearTest(&rc, pExpr, pNode)) && rc==SQLITE_OK);
+  assert( pNode->bEof==0 || pNode->bNomatch==0 );
+
+  return rc;
+}
+
+/*
+** Advance the first term iterator in the first phrase of pNear. Set output
+** variable *pbEof to true if it reaches EOF or if an error occurs.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5ExprNodeNext_STRING(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pNode,            /* FTS5_STRING or FTS5_TERM node */
+  int bFromValid,
+  i64 iFrom 
+){
+  Fts5ExprTerm *pTerm = &pNode->pNear->apPhrase[0]->aTerm[0];
+  int rc = SQLITE_OK;
+
+  pNode->bNomatch = 0;
+  if( pTerm->pSynonym ){
+    int bEof = 1;
+    Fts5ExprTerm *p;
+
+    /* Find the firstest rowid any synonym points to. */
+    i64 iRowid = fts5ExprSynonymRowid(pTerm, pExpr->bDesc, 0);
+
+    /* Advance each iterator that currently points to iRowid. Or, if iFrom
+    ** is valid - each iterator that points to a rowid before iFrom.  */
+    for(p=pTerm; p; p=p->pSynonym){
+      if( sqlite3Fts5IterEof(p->pIter)==0 ){
+        i64 ii = p->pIter->iRowid;
+        if( ii==iRowid 
+         || (bFromValid && ii!=iFrom && (ii>iFrom)==pExpr->bDesc) 
+        ){
+          if( bFromValid ){
+            rc = sqlite3Fts5IterNextFrom(p->pIter, iFrom);
+          }else{
+            rc = sqlite3Fts5IterNext(p->pIter);
+          }
+          if( rc!=SQLITE_OK ) break;
+          if( sqlite3Fts5IterEof(p->pIter)==0 ){
+            bEof = 0;
+          }
+        }else{
+          bEof = 0;
+        }
+      }
+    }
+
+    /* Set the EOF flag if either all synonym iterators are at EOF or an
+    ** error has occurred.  */
+    pNode->bEof = (rc || bEof);
+  }else{
+    Fts5IndexIter *pIter = pTerm->pIter;
+
+    assert( Fts5NodeIsString(pNode) );
+    if( bFromValid ){
+      rc = sqlite3Fts5IterNextFrom(pIter, iFrom);
+    }else{
+      rc = sqlite3Fts5IterNext(pIter);
+    }
+
+    pNode->bEof = (rc || sqlite3Fts5IterEof(pIter));
+  }
+
+  if( pNode->bEof==0 ){
+    assert( rc==SQLITE_OK );
+    rc = fts5ExprNodeTest_STRING(pExpr, pNode);
+  }
+
+  return rc;
+}
+
+
+static int fts5ExprNodeTest_TERM(
+  Fts5Expr *pExpr,                /* Expression that pNear is a part of */
+  Fts5ExprNode *pNode             /* The "NEAR" node (FTS5_TERM) */
+){
+  /* As this "NEAR" object is actually a single phrase that consists 
+  ** of a single term only, grab pointers into the poslist managed by the
+  ** fts5_index.c iterator object. This is much faster than synthesizing 
+  ** a new poslist the way we have to for more complicated phrase or NEAR
+  ** expressions.  */
+  Fts5ExprPhrase *pPhrase = pNode->pNear->apPhrase[0];
+  Fts5IndexIter *pIter = pPhrase->aTerm[0].pIter;
+
+  assert( pNode->eType==FTS5_TERM );
+  assert( pNode->pNear->nPhrase==1 && pPhrase->nTerm==1 );
+  assert( pPhrase->aTerm[0].pSynonym==0 );
+
+  pPhrase->poslist.n = pIter->nData;
+  if( pExpr->pConfig->eDetail==FTS5_DETAIL_FULL ){
+    pPhrase->poslist.p = (u8*)pIter->pData;
+  }
+  pNode->iRowid = pIter->iRowid;
+  pNode->bNomatch = (pPhrase->poslist.n==0);
+  return SQLITE_OK;
+}
+
+/*
+** xNext() method for a node of type FTS5_TERM.
+*/
+static int fts5ExprNodeNext_TERM(
+  Fts5Expr *pExpr, 
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int rc;
+  Fts5IndexIter *pIter = pNode->pNear->apPhrase[0]->aTerm[0].pIter;
+
+  assert( pNode->bEof==0 );
+  if( bFromValid ){
+    rc = sqlite3Fts5IterNextFrom(pIter, iFrom);
+  }else{
+    rc = sqlite3Fts5IterNext(pIter);
+  }
+  if( rc==SQLITE_OK && sqlite3Fts5IterEof(pIter)==0 ){
+    rc = fts5ExprNodeTest_TERM(pExpr, pNode);
+  }else{
+    pNode->bEof = 1;
+    pNode->bNomatch = 0;
+  }
+  return rc;
+}
+
+static void fts5ExprNodeTest_OR(
+  Fts5Expr *pExpr,                /* Expression of which pNode is a part */
+  Fts5ExprNode *pNode             /* Expression node to test */
+){
+  Fts5ExprNode *pNext = pNode->apChild[0];
+  int i;
+
+  for(i=1; i<pNode->nChild; i++){
+    Fts5ExprNode *pChild = pNode->apChild[i];
+    int cmp = fts5NodeCompare(pExpr, pNext, pChild);
+    if( cmp>0 || (cmp==0 && pChild->bNomatch==0) ){
+      pNext = pChild;
+    }
+  }
+  pNode->iRowid = pNext->iRowid;
+  pNode->bEof = pNext->bEof;
+  pNode->bNomatch = pNext->bNomatch;
+}
+
+static int fts5ExprNodeNext_OR(
+  Fts5Expr *pExpr, 
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int i;
+  i64 iLast = pNode->iRowid;
+
+  for(i=0; i<pNode->nChild; i++){
+    Fts5ExprNode *p1 = pNode->apChild[i];
+    assert( p1->bEof || fts5RowidCmp(pExpr, p1->iRowid, iLast)>=0 );
+    if( p1->bEof==0 ){
+      if( (p1->iRowid==iLast) 
+       || (bFromValid && fts5RowidCmp(pExpr, p1->iRowid, iFrom)<0)
+      ){
+        int rc = fts5ExprNodeNext(pExpr, p1, bFromValid, iFrom);
+        if( rc!=SQLITE_OK ){
+          pNode->bNomatch = 0;
+          return rc;
+        }
+      }
+    }
+  }
+
+  fts5ExprNodeTest_OR(pExpr, pNode);
+  return SQLITE_OK;
+}
+
+/*
+** Argument pNode is an FTS5_AND node.
+*/
+static int fts5ExprNodeTest_AND(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pAnd              /* FTS5_AND node to advance */
+){
+  int iChild;
+  i64 iLast = pAnd->iRowid;
+  int rc = SQLITE_OK;
+  int bMatch;
+
+  assert( pAnd->bEof==0 );
+  do {
+    pAnd->bNomatch = 0;
+    bMatch = 1;
+    for(iChild=0; iChild<pAnd->nChild; iChild++){
+      Fts5ExprNode *pChild = pAnd->apChild[iChild];
+      int cmp = fts5RowidCmp(pExpr, iLast, pChild->iRowid);
+      if( cmp>0 ){
+        /* Advance pChild until it points to iLast or laster */
+        rc = fts5ExprNodeNext(pExpr, pChild, 1, iLast);
+        if( rc!=SQLITE_OK ){
+          pAnd->bNomatch = 0;
+          return rc;
+        }
+      }
+
+      /* If the child node is now at EOF, so is the parent AND node. Otherwise,
+      ** the child node is guaranteed to have advanced at least as far as
+      ** rowid iLast. So if it is not at exactly iLast, pChild->iRowid is the
+      ** new lastest rowid seen so far.  */
+      assert( pChild->bEof || fts5RowidCmp(pExpr, iLast, pChild->iRowid)<=0 );
+      if( pChild->bEof ){
+        fts5ExprSetEof(pAnd);
+        bMatch = 1;
+        break;
+      }else if( iLast!=pChild->iRowid ){
+        bMatch = 0;
+        iLast = pChild->iRowid;
+      }
+
+      if( pChild->bNomatch ){
+        pAnd->bNomatch = 1;
+      }
+    }
+  }while( bMatch==0 );
+
+  if( pAnd->bNomatch && pAnd!=pExpr->pRoot ){
+    fts5ExprNodeZeroPoslist(pAnd);
+  }
+  pAnd->iRowid = iLast;
+  return SQLITE_OK;
+}
+
+static int fts5ExprNodeNext_AND(
+  Fts5Expr *pExpr, 
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int rc = fts5ExprNodeNext(pExpr, pNode->apChild[0], bFromValid, iFrom);
+  if( rc==SQLITE_OK ){
+    rc = fts5ExprNodeTest_AND(pExpr, pNode);
+  }else{
+    pNode->bNomatch = 0;
+  }
+  return rc;
+}
+
+static int fts5ExprNodeTest_NOT(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pNode             /* FTS5_NOT node to advance */
+){
+  int rc = SQLITE_OK;
+  Fts5ExprNode *p1 = pNode->apChild[0];
+  Fts5ExprNode *p2 = pNode->apChild[1];
+  assert( pNode->nChild==2 );
+
+  while( rc==SQLITE_OK && p1->bEof==0 ){
+    int cmp = fts5NodeCompare(pExpr, p1, p2);
+    if( cmp>0 ){
+      rc = fts5ExprNodeNext(pExpr, p2, 1, p1->iRowid);
+      cmp = fts5NodeCompare(pExpr, p1, p2);
+    }
+    assert( rc!=SQLITE_OK || cmp<=0 );
+    if( cmp || p2->bNomatch ) break;
+    rc = fts5ExprNodeNext(pExpr, p1, 0, 0);
+  }
+  pNode->bEof = p1->bEof;
+  pNode->bNomatch = p1->bNomatch;
+  pNode->iRowid = p1->iRowid;
+  if( p1->bEof ){
+    fts5ExprNodeZeroPoslist(p2);
+  }
+  return rc;
+}
+
+static int fts5ExprNodeNext_NOT(
+  Fts5Expr *pExpr, 
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int rc = fts5ExprNodeNext(pExpr, pNode->apChild[0], bFromValid, iFrom);
+  if( rc==SQLITE_OK ){
+    rc = fts5ExprNodeTest_NOT(pExpr, pNode);
+  }
+  if( rc!=SQLITE_OK ){
+    pNode->bNomatch = 0;
+  }
+  return rc;
+}
+
+/*
+** If pNode currently points to a match, this function returns SQLITE_OK
+** without modifying it. Otherwise, pNode is advanced until it does point
+** to a match or EOF is reached.
+*/
+static int fts5ExprNodeTest(
+  Fts5Expr *pExpr,                /* Expression of which pNode is a part */
+  Fts5ExprNode *pNode             /* Expression node to test */
+){
+  int rc = SQLITE_OK;
+  if( pNode->bEof==0 ){
+    switch( pNode->eType ){
+
+      case FTS5_STRING: {
+        rc = fts5ExprNodeTest_STRING(pExpr, pNode);
+        break;
+      }
+
+      case FTS5_TERM: {
+        rc = fts5ExprNodeTest_TERM(pExpr, pNode);
+        break;
+      }
+
+      case FTS5_AND: {
+        rc = fts5ExprNodeTest_AND(pExpr, pNode);
+        break;
+      }
+
+      case FTS5_OR: {
+        fts5ExprNodeTest_OR(pExpr, pNode);
+        break;
+      }
+
+      default: assert( pNode->eType==FTS5_NOT ); {
+        rc = fts5ExprNodeTest_NOT(pExpr, pNode);
+        break;
+      }
+    }
+  }
+  return rc;
+}
+
+ 
+/*
+** Set node pNode, which is part of expression pExpr, to point to the first
+** match. If there are no matches, set the Node.bEof flag to indicate EOF.
+**
+** Return an SQLite error code if an error occurs, or SQLITE_OK otherwise.
+** It is not an error if there are no matches.
+*/
+static int fts5ExprNodeFirst(Fts5Expr *pExpr, Fts5ExprNode *pNode){
+  int rc = SQLITE_OK;
+  pNode->bEof = 0;
+  pNode->bNomatch = 0;
+
+  if( Fts5NodeIsString(pNode) ){
+    /* Initialize all term iterators in the NEAR object. */
+    rc = fts5ExprNearInitAll(pExpr, pNode);
+  }else if( pNode->xNext==0 ){
+    pNode->bEof = 1;
+  }else{
+    int i;
+    int nEof = 0;
+    for(i=0; i<pNode->nChild && rc==SQLITE_OK; i++){
+      Fts5ExprNode *pChild = pNode->apChild[i];
+      rc = fts5ExprNodeFirst(pExpr, pNode->apChild[i]);
+      assert( pChild->bEof==0 || pChild->bEof==1 );
+      nEof += pChild->bEof;
+    }
+    pNode->iRowid = pNode->apChild[0]->iRowid;
+
+    switch( pNode->eType ){
+      case FTS5_AND:
+        if( nEof>0 ) fts5ExprSetEof(pNode);
+        break;
+
+      case FTS5_OR:
+        if( pNode->nChild==nEof ) fts5ExprSetEof(pNode);
+        break;
+
+      default:
+        assert( pNode->eType==FTS5_NOT );
+        pNode->bEof = pNode->apChild[0]->bEof;
+        break;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = fts5ExprNodeTest(pExpr, pNode);
+  }
+  return rc;
+}
+
+
+/*
+** Begin iterating through the set of documents in index pIdx matched by
+** the MATCH expression passed as the first argument. If the "bDesc" 
+** parameter is passed a non-zero value, iteration is in descending rowid 
+** order. Or, if it is zero, in ascending order.
+**
+** If iterating in ascending rowid order (bDesc==0), the first document
+** visited is that with the smallest rowid that is larger than or equal
+** to parameter iFirst. Or, if iterating in ascending order (bDesc==1),
+** then the first document visited must have a rowid smaller than or
+** equal to iFirst.
+**
+** Return SQLITE_OK if successful, or an SQLite error code otherwise. It
+** is not considered an error if the query does not match any documents.
+*/
+static int sqlite3Fts5ExprFirst(Fts5Expr *p, Fts5Index *pIdx, i64 iFirst, int bDesc){
+  Fts5ExprNode *pRoot = p->pRoot;
+  int rc;                         /* Return code */
+
+  p->pIndex = pIdx;
+  p->bDesc = bDesc;
+  rc = fts5ExprNodeFirst(p, pRoot);
+
+  /* If not at EOF but the current rowid occurs earlier than iFirst in
+  ** the iteration order, move to document iFirst or later. */
+  if( rc==SQLITE_OK 
+   && 0==pRoot->bEof 
+   && fts5RowidCmp(p, pRoot->iRowid, iFirst)<0 
+  ){
+    rc = fts5ExprNodeNext(p, pRoot, 1, iFirst);
+  }
+
+  /* If the iterator is not at a real match, skip forward until it is. */
+  while( pRoot->bNomatch && rc==SQLITE_OK ){
+    assert( pRoot->bEof==0 );
+    rc = fts5ExprNodeNext(p, pRoot, 0, 0);
+  }
+  return rc;
+}
+
+/*
+** Move to the next document 
+**
+** Return SQLITE_OK if successful, or an SQLite error code otherwise. It
+** is not considered an error if the query does not match any documents.
+*/
+static int sqlite3Fts5ExprNext(Fts5Expr *p, i64 iLast){
+  int rc;
+  Fts5ExprNode *pRoot = p->pRoot;
+  assert( pRoot->bEof==0 && pRoot->bNomatch==0 );
+  do {
+    rc = fts5ExprNodeNext(p, pRoot, 0, 0);
+    assert( pRoot->bNomatch==0 || (rc==SQLITE_OK && pRoot->bEof==0) );
+  }while( pRoot->bNomatch );
+  if( fts5RowidCmp(p, pRoot->iRowid, iLast)>0 ){
+    pRoot->bEof = 1;
+  }
+  return rc;
+}
+
+static int sqlite3Fts5ExprEof(Fts5Expr *p){
+  return p->pRoot->bEof;
+}
+
+static i64 sqlite3Fts5ExprRowid(Fts5Expr *p){
+  return p->pRoot->iRowid;
+}
+
+static int fts5ParseStringFromToken(Fts5Token *pToken, char **pz){
+  int rc = SQLITE_OK;
+  *pz = sqlite3Fts5Strndup(&rc, pToken->p, pToken->n);
+  return rc;
+}
+
+/*
+** Free the phrase object passed as the only argument.
+*/
+static void fts5ExprPhraseFree(Fts5ExprPhrase *pPhrase){
+  if( pPhrase ){
+    int i;
+    for(i=0; i<pPhrase->nTerm; i++){
+      Fts5ExprTerm *pSyn;
+      Fts5ExprTerm *pNext;
+      Fts5ExprTerm *pTerm = &pPhrase->aTerm[i];
+      sqlite3_free(pTerm->pTerm);
+      sqlite3Fts5IterClose(pTerm->pIter);
+      for(pSyn=pTerm->pSynonym; pSyn; pSyn=pNext){
+        pNext = pSyn->pSynonym;
+        sqlite3Fts5IterClose(pSyn->pIter);
+        fts5BufferFree((Fts5Buffer*)&pSyn[1]);
+        sqlite3_free(pSyn);
+      }
+    }
+    if( pPhrase->poslist.nSpace>0 ) fts5BufferFree(&pPhrase->poslist);
+    sqlite3_free(pPhrase);
+  }
+}
+
+/*
+** Set the "bFirst" flag on the first token of the phrase passed as the
+** only argument.
+*/
+static void sqlite3Fts5ParseSetCaret(Fts5ExprPhrase *pPhrase){
+  if( pPhrase && pPhrase->nTerm ){
+    pPhrase->aTerm[0].bFirst = 1;
+  }
+}
+
+/*
+** If argument pNear is NULL, then a new Fts5ExprNearset object is allocated
+** and populated with pPhrase. Or, if pNear is not NULL, phrase pPhrase is
+** appended to it and the results returned.
+**
+** If an OOM error occurs, both the pNear and pPhrase objects are freed and
+** NULL returned.
+*/
+static Fts5ExprNearset *sqlite3Fts5ParseNearset(
+  Fts5Parse *pParse,              /* Parse context */
+  Fts5ExprNearset *pNear,         /* Existing nearset, or NULL */
+  Fts5ExprPhrase *pPhrase         /* Recently parsed phrase */
+){
+  const int SZALLOC = 8;
+  Fts5ExprNearset *pRet = 0;
+
+  if( pParse->rc==SQLITE_OK ){
+    if( pPhrase==0 ){
+      return pNear;
+    }
+    if( pNear==0 ){
+      sqlite3_int64 nByte;
+      nByte = sizeof(Fts5ExprNearset) + SZALLOC * sizeof(Fts5ExprPhrase*);
+      pRet = sqlite3_malloc64(nByte);
+      if( pRet==0 ){
+        pParse->rc = SQLITE_NOMEM;
+      }else{
+        memset(pRet, 0, (size_t)nByte);
+      }
+    }else if( (pNear->nPhrase % SZALLOC)==0 ){
+      int nNew = pNear->nPhrase + SZALLOC;
+      sqlite3_int64 nByte;
+
+      nByte = sizeof(Fts5ExprNearset) + nNew * sizeof(Fts5ExprPhrase*);
+      pRet = (Fts5ExprNearset*)sqlite3_realloc64(pNear, nByte);
+      if( pRet==0 ){
+        pParse->rc = SQLITE_NOMEM;
+      }
+    }else{
+      pRet = pNear;
+    }
+  }
+
+  if( pRet==0 ){
+    assert( pParse->rc!=SQLITE_OK );
+    sqlite3Fts5ParseNearsetFree(pNear);
+    sqlite3Fts5ParsePhraseFree(pPhrase);
+  }else{
+    if( pRet->nPhrase>0 ){
+      Fts5ExprPhrase *pLast = pRet->apPhrase[pRet->nPhrase-1];
+      assert( pParse!=0 );
+      assert( pParse->apPhrase!=0 );
+      assert( pParse->nPhrase>=2 );
+      assert( pLast==pParse->apPhrase[pParse->nPhrase-2] );
+      if( pPhrase->nTerm==0 ){
+        fts5ExprPhraseFree(pPhrase);
+        pRet->nPhrase--;
+        pParse->nPhrase--;
+        pPhrase = pLast;
+      }else if( pLast->nTerm==0 ){
+        fts5ExprPhraseFree(pLast);
+        pParse->apPhrase[pParse->nPhrase-2] = pPhrase;
+        pParse->nPhrase--;
+        pRet->nPhrase--;
+      }
+    }
+    pRet->apPhrase[pRet->nPhrase++] = pPhrase;
+  }
+  return pRet;
+}
+
+typedef struct TokenCtx TokenCtx;
+struct TokenCtx {
+  Fts5ExprPhrase *pPhrase;
+  Fts5Config *pConfig;
+  int rc;
+};
+
+/*
+** Callback for tokenizing terms used by ParseTerm().
+*/
+static int fts5ParseTokenize(
+  void *pContext,                 /* Pointer to Fts5InsertCtx object */
+  int tflags,                     /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  int rc = SQLITE_OK;
+  const int SZALLOC = 8;
+  TokenCtx *pCtx = (TokenCtx*)pContext;
+  Fts5ExprPhrase *pPhrase = pCtx->pPhrase;
+
+  UNUSED_PARAM2(iUnused1, iUnused2);
+
+  /* If an error has already occurred, this is a no-op */
+  if( pCtx->rc!=SQLITE_OK ) return pCtx->rc;
+  if( nToken>FTS5_MAX_TOKEN_SIZE ) nToken = FTS5_MAX_TOKEN_SIZE;
+
+  if( pPhrase && pPhrase->nTerm>0 && (tflags & FTS5_TOKEN_COLOCATED) ){
+    Fts5ExprTerm *pSyn;
+    sqlite3_int64 nByte = sizeof(Fts5ExprTerm) + sizeof(Fts5Buffer) + nToken+1;
+    pSyn = (Fts5ExprTerm*)sqlite3_malloc64(nByte);
+    if( pSyn==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(pSyn, 0, (size_t)nByte);
+      pSyn->pTerm = ((char*)pSyn) + sizeof(Fts5ExprTerm) + sizeof(Fts5Buffer);
+      pSyn->nFullTerm = pSyn->nQueryTerm = nToken;
+      if( pCtx->pConfig->bTokendata ){
+        pSyn->nQueryTerm = (int)strlen(pSyn->pTerm);
+      }
+      memcpy(pSyn->pTerm, pToken, nToken);
+      pSyn->pSynonym = pPhrase->aTerm[pPhrase->nTerm-1].pSynonym;
+      pPhrase->aTerm[pPhrase->nTerm-1].pSynonym = pSyn;
+    }
+  }else{
+    Fts5ExprTerm *pTerm;
+    if( pPhrase==0 || (pPhrase->nTerm % SZALLOC)==0 ){
+      Fts5ExprPhrase *pNew;
+      int nNew = SZALLOC + (pPhrase ? pPhrase->nTerm : 0);
+
+      pNew = (Fts5ExprPhrase*)sqlite3_realloc64(pPhrase, 
+          sizeof(Fts5ExprPhrase) + sizeof(Fts5ExprTerm) * nNew
+      );
+      if( pNew==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        if( pPhrase==0 ) memset(pNew, 0, sizeof(Fts5ExprPhrase));
+        pCtx->pPhrase = pPhrase = pNew;
+        pNew->nTerm = nNew - SZALLOC;
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      pTerm = &pPhrase->aTerm[pPhrase->nTerm++];
+      memset(pTerm, 0, sizeof(Fts5ExprTerm));
+      pTerm->pTerm = sqlite3Fts5Strndup(&rc, pToken, nToken);
+      pTerm->nFullTerm = pTerm->nQueryTerm = nToken;
+      if( pCtx->pConfig->bTokendata && rc==SQLITE_OK ){ 
+        pTerm->nQueryTerm = (int)strlen(pTerm->pTerm);
+      }
+    }
+  }
+
+  pCtx->rc = rc;
+  return rc;
+}
+
+
+/*
+** Free the phrase object passed as the only argument.
+*/
+static void sqlite3Fts5ParsePhraseFree(Fts5ExprPhrase *pPhrase){
+  fts5ExprPhraseFree(pPhrase);
+}
+
+/*
+** Free the phrase object passed as the second argument.
+*/
+static void sqlite3Fts5ParseNearsetFree(Fts5ExprNearset *pNear){
+  if( pNear ){
+    int i;
+    for(i=0; i<pNear->nPhrase; i++){
+      fts5ExprPhraseFree(pNear->apPhrase[i]);
+    }
+    sqlite3_free(pNear->pColset);
+    sqlite3_free(pNear);
+  }
+}
+
+static void sqlite3Fts5ParseFinished(Fts5Parse *pParse, Fts5ExprNode *p){
+  assert( pParse->pExpr==0 );
+  pParse->pExpr = p;
+}
+
+static int parseGrowPhraseArray(Fts5Parse *pParse){
+  if( (pParse->nPhrase % 8)==0 ){
+    sqlite3_int64 nByte = sizeof(Fts5ExprPhrase*) * (pParse->nPhrase + 8);
+    Fts5ExprPhrase **apNew;
+    apNew = (Fts5ExprPhrase**)sqlite3_realloc64(pParse->apPhrase, nByte);
+    if( apNew==0 ){
+      pParse->rc = SQLITE_NOMEM;
+      return SQLITE_NOMEM;
+    }
+    pParse->apPhrase = apNew;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** This function is called by the parser to process a string token. The
+** string may or may not be quoted. In any case it is tokenized and a
+** phrase object consisting of all tokens returned.
+*/
+static Fts5ExprPhrase *sqlite3Fts5ParseTerm(
+  Fts5Parse *pParse,              /* Parse context */
+  Fts5ExprPhrase *pAppend,        /* Phrase to append to */
+  Fts5Token *pToken,              /* String to tokenize */
+  int bPrefix                     /* True if there is a trailing "*" */
+){
+  Fts5Config *pConfig = pParse->pConfig;
+  TokenCtx sCtx;                  /* Context object passed to callback */
+  int rc;                         /* Tokenize return code */
+  char *z = 0;
+
+  memset(&sCtx, 0, sizeof(TokenCtx));
+  sCtx.pPhrase = pAppend;
+  sCtx.pConfig = pConfig;
+
+  rc = fts5ParseStringFromToken(pToken, &z);
+  if( rc==SQLITE_OK ){
+    int flags = FTS5_TOKENIZE_QUERY | (bPrefix ? FTS5_TOKENIZE_PREFIX : 0);
+    int n;
+    sqlite3Fts5Dequote(z);
+    n = (int)strlen(z);
+    rc = sqlite3Fts5Tokenize(pConfig, flags, z, n, &sCtx, fts5ParseTokenize);
+  }
+  sqlite3_free(z);
+  if( rc || (rc = sCtx.rc) ){
+    pParse->rc = rc;
+    fts5ExprPhraseFree(sCtx.pPhrase);
+    sCtx.pPhrase = 0;
+  }else{
+
+    if( pAppend==0 ){
+      if( parseGrowPhraseArray(pParse) ){
+        fts5ExprPhraseFree(sCtx.pPhrase);
+        return 0;
+      }
+      pParse->nPhrase++;
+    }
+
+    if( sCtx.pPhrase==0 ){
+      /* This happens when parsing a token or quoted phrase that contains
+      ** no token characters at all. (e.g ... MATCH '""'). */
+      sCtx.pPhrase = sqlite3Fts5MallocZero(&pParse->rc, sizeof(Fts5ExprPhrase));
+    }else if( sCtx.pPhrase->nTerm ){
+      sCtx.pPhrase->aTerm[sCtx.pPhrase->nTerm-1].bPrefix = (u8)bPrefix;
+    }
+    pParse->apPhrase[pParse->nPhrase-1] = sCtx.pPhrase;
+  }
+
+  return sCtx.pPhrase;
+}
+
+/*
+** Create a new FTS5 expression by cloning phrase iPhrase of the
+** expression passed as the second argument.
+*/
+static int sqlite3Fts5ExprClonePhrase(
+  Fts5Expr *pExpr, 
+  int iPhrase, 
+  Fts5Expr **ppNew
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5ExprPhrase *pOrig = 0;      /* The phrase extracted from pExpr */
+  Fts5Expr *pNew = 0;             /* Expression to return via *ppNew */
+  TokenCtx sCtx = {0,0,0};        /* Context object for fts5ParseTokenize */
+  if( iPhrase<0 || iPhrase>=pExpr->nPhrase ){
+    rc = SQLITE_RANGE;
+  }else{
+    pOrig = pExpr->apExprPhrase[iPhrase];
+    pNew = (Fts5Expr*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5Expr));
+  }
+  if( rc==SQLITE_OK ){
+    pNew->apExprPhrase = (Fts5ExprPhrase**)sqlite3Fts5MallocZero(&rc, 
+        sizeof(Fts5ExprPhrase*));
+  }
+  if( rc==SQLITE_OK ){
+    pNew->pRoot = (Fts5ExprNode*)sqlite3Fts5MallocZero(&rc, 
+        sizeof(Fts5ExprNode));
+  }
+  if( rc==SQLITE_OK ){
+    pNew->pRoot->pNear = (Fts5ExprNearset*)sqlite3Fts5MallocZero(&rc, 
+        sizeof(Fts5ExprNearset) + sizeof(Fts5ExprPhrase*));
+  }
+  if( rc==SQLITE_OK && ALWAYS(pOrig!=0) ){
+    Fts5Colset *pColsetOrig = pOrig->pNode->pNear->pColset;
+    if( pColsetOrig ){
+      sqlite3_int64 nByte;
+      Fts5Colset *pColset;
+      nByte = sizeof(Fts5Colset) + (pColsetOrig->nCol-1) * sizeof(int);
+      pColset = (Fts5Colset*)sqlite3Fts5MallocZero(&rc, nByte);
+      if( pColset ){ 
+        memcpy(pColset, pColsetOrig, (size_t)nByte);
+      }
+      pNew->pRoot->pNear->pColset = pColset;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    if( pOrig->nTerm ){
+      int i;                          /* Used to iterate through phrase terms */
+      sCtx.pConfig = pExpr->pConfig;
+      for(i=0; rc==SQLITE_OK && i<pOrig->nTerm; i++){
+        int tflags = 0;
+        Fts5ExprTerm *p;
+        for(p=&pOrig->aTerm[i]; p && rc==SQLITE_OK; p=p->pSynonym){
+          rc = fts5ParseTokenize((void*)&sCtx,tflags,p->pTerm,p->nFullTerm,0,0);
+          tflags = FTS5_TOKEN_COLOCATED;
+        }
+        if( rc==SQLITE_OK ){
+          sCtx.pPhrase->aTerm[i].bPrefix = pOrig->aTerm[i].bPrefix;
+          sCtx.pPhrase->aTerm[i].bFirst = pOrig->aTerm[i].bFirst;
+        }
+      }
+    }else{
+      /* This happens when parsing a token or quoted phrase that contains
+      ** no token characters at all. (e.g ... MATCH '""'). */
+      sCtx.pPhrase = sqlite3Fts5MallocZero(&rc, sizeof(Fts5ExprPhrase));
+    }
+  }
+
+  if( rc==SQLITE_OK && ALWAYS(sCtx.pPhrase) ){
+    /* All the allocations succeeded. Put the expression object together. */
+    pNew->pIndex = pExpr->pIndex;
+    pNew->pConfig = pExpr->pConfig;
+    pNew->nPhrase = 1;
+    pNew->apExprPhrase[0] = sCtx.pPhrase;
+    pNew->pRoot->pNear->apPhrase[0] = sCtx.pPhrase;
+    pNew->pRoot->pNear->nPhrase = 1;
+    sCtx.pPhrase->pNode = pNew->pRoot;
+
+    if( pOrig->nTerm==1 
+     && pOrig->aTerm[0].pSynonym==0 
+     && pOrig->aTerm[0].bFirst==0 
+    ){
+      pNew->pRoot->eType = FTS5_TERM;
+      pNew->pRoot->xNext = fts5ExprNodeNext_TERM;
+    }else{
+      pNew->pRoot->eType = FTS5_STRING;
+      pNew->pRoot->xNext = fts5ExprNodeNext_STRING;
+    }
+  }else{
+    sqlite3Fts5ExprFree(pNew);
+    fts5ExprPhraseFree(sCtx.pPhrase);
+    pNew = 0;
+  }
+
+  *ppNew = pNew;
+  return rc;
+}
+
+
+/*
+** Token pTok has appeared in a MATCH expression where the NEAR operator
+** is expected. If token pTok does not contain "NEAR", store an error
+** in the pParse object.
+*/
+static void sqlite3Fts5ParseNear(Fts5Parse *pParse, Fts5Token *pTok){
+  if( pTok->n!=4 || memcmp("NEAR", pTok->p, 4) ){
+    sqlite3Fts5ParseError(
+        pParse, "fts5: syntax error near \"%.*s\"", pTok->n, pTok->p
+    );
+  }
+}
+
+static void sqlite3Fts5ParseSetDistance(
+  Fts5Parse *pParse, 
+  Fts5ExprNearset *pNear,
+  Fts5Token *p
+){
+  if( pNear ){
+    int nNear = 0;
+    int i;
+    if( p->n ){
+      for(i=0; i<p->n; i++){
+        char c = (char)p->p[i];
+        if( c<'0' || c>'9' ){
+          sqlite3Fts5ParseError(
+              pParse, "expected integer, got \"%.*s\"", p->n, p->p
+              );
+          return;
+        }
+        nNear = nNear * 10 + (p->p[i] - '0');
+      }
+    }else{
+      nNear = FTS5_DEFAULT_NEARDIST;
+    }
+    pNear->nNear = nNear;
+  }
+}
+
+/*
+** The second argument passed to this function may be NULL, or it may be
+** an existing Fts5Colset object. This function returns a pointer to
+** a new colset object containing the contents of (p) with new value column
+** number iCol appended. 
+**
+** If an OOM error occurs, store an error code in pParse and return NULL.
+** The old colset object (if any) is not freed in this case.
+*/
+static Fts5Colset *fts5ParseColset(
+  Fts5Parse *pParse,              /* Store SQLITE_NOMEM here if required */
+  Fts5Colset *p,                  /* Existing colset object */
+  int iCol                        /* New column to add to colset object */
+){
+  int nCol = p ? p->nCol : 0;     /* Num. columns already in colset object */
+  Fts5Colset *pNew;               /* New colset object to return */
+
+  assert( pParse->rc==SQLITE_OK );
+  assert( iCol>=0 && iCol<pParse->pConfig->nCol );
+
+  pNew = sqlite3_realloc64(p, sizeof(Fts5Colset) + sizeof(int)*nCol);
+  if( pNew==0 ){
+    pParse->rc = SQLITE_NOMEM;
+  }else{
+    int *aiCol = pNew->aiCol;
+    int i, j;
+    for(i=0; i<nCol; i++){
+      if( aiCol[i]==iCol ) return pNew;
+      if( aiCol[i]>iCol ) break;
+    }
+    for(j=nCol; j>i; j--){
+      aiCol[j] = aiCol[j-1];
+    }
+    aiCol[i] = iCol;
+    pNew->nCol = nCol+1;
+
+#ifndef NDEBUG
+    /* Check that the array is in order and contains no duplicate entries. */
+    for(i=1; i<pNew->nCol; i++) assert( pNew->aiCol[i]>pNew->aiCol[i-1] );
+#endif
+  }
+
+  return pNew;
+}
+
+/*
+** Allocate and return an Fts5Colset object specifying the inverse of
+** the colset passed as the second argument. Free the colset passed
+** as the second argument before returning.
+*/
+static Fts5Colset *sqlite3Fts5ParseColsetInvert(Fts5Parse *pParse, Fts5Colset *p){
+  Fts5Colset *pRet;
+  int nCol = pParse->pConfig->nCol;
+
+  pRet = (Fts5Colset*)sqlite3Fts5MallocZero(&pParse->rc, 
+      sizeof(Fts5Colset) + sizeof(int)*nCol
+  );
+  if( pRet ){
+    int i;
+    int iOld = 0;
+    for(i=0; i<nCol; i++){
+      if( iOld>=p->nCol || p->aiCol[iOld]!=i ){
+        pRet->aiCol[pRet->nCol++] = i;
+      }else{
+        iOld++;
+      }
+    }
+  }
+
+  sqlite3_free(p);
+  return pRet;
+}
+
+static Fts5Colset *sqlite3Fts5ParseColset(
+  Fts5Parse *pParse,              /* Store SQLITE_NOMEM here if required */
+  Fts5Colset *pColset,            /* Existing colset object */
+  Fts5Token *p
+){
+  Fts5Colset *pRet = 0;
+  int iCol;
+  char *z;                        /* Dequoted copy of token p */
+
+  z = sqlite3Fts5Strndup(&pParse->rc, p->p, p->n);
+  if( pParse->rc==SQLITE_OK ){
+    Fts5Config *pConfig = pParse->pConfig;
+    sqlite3Fts5Dequote(z);
+    for(iCol=0; iCol<pConfig->nCol; iCol++){
+      if( 0==sqlite3_stricmp(pConfig->azCol[iCol], z) ) break;
+    }
+    if( iCol==pConfig->nCol ){
+      sqlite3Fts5ParseError(pParse, "no such column: %s", z);
+    }else{
+      pRet = fts5ParseColset(pParse, pColset, iCol);
+    }
+    sqlite3_free(z);
+  }
+
+  if( pRet==0 ){
+    assert( pParse->rc!=SQLITE_OK );
+    sqlite3_free(pColset);
+  }
+
+  return pRet;
+}
+
+/*
+** If argument pOrig is NULL, or if (*pRc) is set to anything other than
+** SQLITE_OK when this function is called, NULL is returned. 
+**
+** Otherwise, a copy of (*pOrig) is made into memory obtained from
+** sqlite3Fts5MallocZero() and a pointer to it returned. If the allocation
+** fails, (*pRc) is set to SQLITE_NOMEM and NULL is returned.
+*/
+static Fts5Colset *fts5CloneColset(int *pRc, Fts5Colset *pOrig){
+  Fts5Colset *pRet;
+  if( pOrig ){
+    sqlite3_int64 nByte = sizeof(Fts5Colset) + (pOrig->nCol-1) * sizeof(int);
+    pRet = (Fts5Colset*)sqlite3Fts5MallocZero(pRc, nByte);
+    if( pRet ){ 
+      memcpy(pRet, pOrig, (size_t)nByte);
+    }
+  }else{
+    pRet = 0;
+  }
+  return pRet;
+}
+
+/*
+** Remove from colset pColset any columns that are not also in colset pMerge.
+*/
+static void fts5MergeColset(Fts5Colset *pColset, Fts5Colset *pMerge){
+  int iIn = 0;          /* Next input in pColset */
+  int iMerge = 0;       /* Next input in pMerge */
+  int iOut = 0;         /* Next output slot in pColset */
+
+  while( iIn<pColset->nCol && iMerge<pMerge->nCol ){
+    int iDiff = pColset->aiCol[iIn] - pMerge->aiCol[iMerge];
+    if( iDiff==0 ){
+      pColset->aiCol[iOut++] = pMerge->aiCol[iMerge];
+      iMerge++;
+      iIn++;
+    }else if( iDiff>0 ){
+      iMerge++;
+    }else{
+      iIn++;
+    }
+  }
+  pColset->nCol = iOut;
+}
+
+/*
+** Recursively apply colset pColset to expression node pNode and all of
+** its decendents. If (*ppFree) is not NULL, it contains a spare copy
+** of pColset. This function may use the spare copy and set (*ppFree) to
+** zero, or it may create copies of pColset using fts5CloneColset().
+*/
+static void fts5ParseSetColset(
+  Fts5Parse *pParse, 
+  Fts5ExprNode *pNode, 
+  Fts5Colset *pColset,
+  Fts5Colset **ppFree
+){
+  if( pParse->rc==SQLITE_OK ){
+    assert( pNode->eType==FTS5_TERM || pNode->eType==FTS5_STRING 
+         || pNode->eType==FTS5_AND  || pNode->eType==FTS5_OR
+         || pNode->eType==FTS5_NOT  || pNode->eType==FTS5_EOF
+    );
+    if( pNode->eType==FTS5_STRING || pNode->eType==FTS5_TERM ){
+      Fts5ExprNearset *pNear = pNode->pNear;
+      if( pNear->pColset ){
+        fts5MergeColset(pNear->pColset, pColset);
+        if( pNear->pColset->nCol==0 ){
+          pNode->eType = FTS5_EOF;
+          pNode->xNext = 0;
+        }
+      }else if( *ppFree ){
+        pNear->pColset = pColset;
+        *ppFree = 0;
+      }else{
+        pNear->pColset = fts5CloneColset(&pParse->rc, pColset);
+      }
+    }else{
+      int i;
+      assert( pNode->eType!=FTS5_EOF || pNode->nChild==0 );
+      for(i=0; i<pNode->nChild; i++){
+        fts5ParseSetColset(pParse, pNode->apChild[i], pColset, ppFree);
+      }
+    }
+  }
+}
+
+/*
+** Apply colset pColset to expression node pExpr and all of its descendents.
+*/
+static void sqlite3Fts5ParseSetColset(
+  Fts5Parse *pParse, 
+  Fts5ExprNode *pExpr, 
+  Fts5Colset *pColset 
+){
+  Fts5Colset *pFree = pColset;
+  if( pParse->pConfig->eDetail==FTS5_DETAIL_NONE ){
+    sqlite3Fts5ParseError(pParse, 
+        "fts5: column queries are not supported (detail=none)"
+    );
+  }else{
+    fts5ParseSetColset(pParse, pExpr, pColset, &pFree);
+  }
+  sqlite3_free(pFree);
+}
+
+static void fts5ExprAssignXNext(Fts5ExprNode *pNode){
+  switch( pNode->eType ){
+    case FTS5_STRING: {
+      Fts5ExprNearset *pNear = pNode->pNear;
+      if( pNear->nPhrase==1 && pNear->apPhrase[0]->nTerm==1 
+       && pNear->apPhrase[0]->aTerm[0].pSynonym==0
+       && pNear->apPhrase[0]->aTerm[0].bFirst==0
+      ){
+        pNode->eType = FTS5_TERM;
+        pNode->xNext = fts5ExprNodeNext_TERM;
+      }else{
+        pNode->xNext = fts5ExprNodeNext_STRING;
+      }
+      break;
+    };
+
+    case FTS5_OR: {
+      pNode->xNext = fts5ExprNodeNext_OR;
+      break;
+    };
+
+    case FTS5_AND: {
+      pNode->xNext = fts5ExprNodeNext_AND;
+      break;
+    };
+
+    default: assert( pNode->eType==FTS5_NOT ); {
+      pNode->xNext = fts5ExprNodeNext_NOT;
+      break;
+    };
+  }
+}
+
+static void fts5ExprAddChildren(Fts5ExprNode *p, Fts5ExprNode *pSub){
+  int ii = p->nChild;
+  if( p->eType!=FTS5_NOT && pSub->eType==p->eType ){
+    int nByte = sizeof(Fts5ExprNode*) * pSub->nChild;
+    memcpy(&p->apChild[p->nChild], pSub->apChild, nByte);
+    p->nChild += pSub->nChild;
+    sqlite3_free(pSub);
+  }else{
+    p->apChild[p->nChild++] = pSub;
+  }
+  for( ; ii<p->nChild; ii++){
+    p->iHeight = MAX(p->iHeight, p->apChild[ii]->iHeight + 1);
+  }
+}
+
+/*
+** This function is used when parsing LIKE or GLOB patterns against
+** trigram indexes that specify either detail=column or detail=none.
+** It converts a phrase:
+**
+**     abc + def + ghi
+**
+** into an AND tree:
+**
+**     abc AND def AND ghi
+*/
+static Fts5ExprNode *fts5ParsePhraseToAnd(
+  Fts5Parse *pParse, 
+  Fts5ExprNearset *pNear
+){
+  int nTerm = pNear->apPhrase[0]->nTerm;
+  int ii;
+  int nByte;
+  Fts5ExprNode *pRet;
+
+  assert( pNear->nPhrase==1 );
+  assert( pParse->bPhraseToAnd );
+
+  nByte = sizeof(Fts5ExprNode) + nTerm*sizeof(Fts5ExprNode*);
+  pRet = (Fts5ExprNode*)sqlite3Fts5MallocZero(&pParse->rc, nByte);
+  if( pRet ){
+    pRet->eType = FTS5_AND;
+    pRet->nChild = nTerm;
+    pRet->iHeight = 1;
+    fts5ExprAssignXNext(pRet);
+    pParse->nPhrase--;
+    for(ii=0; ii<nTerm; ii++){
+      Fts5ExprPhrase *pPhrase = (Fts5ExprPhrase*)sqlite3Fts5MallocZero(
+          &pParse->rc, sizeof(Fts5ExprPhrase)
+      );
+      if( pPhrase ){
+        if( parseGrowPhraseArray(pParse) ){
+          fts5ExprPhraseFree(pPhrase);
+        }else{
+          Fts5ExprTerm *p = &pNear->apPhrase[0]->aTerm[ii];
+          Fts5ExprTerm *pTo = &pPhrase->aTerm[0];
+          pParse->apPhrase[pParse->nPhrase++] = pPhrase;
+          pPhrase->nTerm = 1;
+          pTo->pTerm = sqlite3Fts5Strndup(&pParse->rc, p->pTerm, p->nFullTerm);
+          pTo->nQueryTerm = p->nQueryTerm;
+          pTo->nFullTerm = p->nFullTerm;
+          pRet->apChild[ii] = sqlite3Fts5ParseNode(pParse, FTS5_STRING, 
+              0, 0, sqlite3Fts5ParseNearset(pParse, 0, pPhrase)
+          );
+        }
+      }
+    }
+  
+    if( pParse->rc ){
+      sqlite3Fts5ParseNodeFree(pRet);
+      pRet = 0;
+    }else{
+      sqlite3Fts5ParseNearsetFree(pNear);
+    }
+  }
+
+  return pRet;
+}
+
+/*
+** Allocate and return a new expression object. If anything goes wrong (i.e.
+** OOM error), leave an error code in pParse and return NULL.
+*/
+static Fts5ExprNode *sqlite3Fts5ParseNode(
+  Fts5Parse *pParse,              /* Parse context */
+  int eType,                      /* FTS5_STRING, AND, OR or NOT */
+  Fts5ExprNode *pLeft,            /* Left hand child expression */
+  Fts5ExprNode *pRight,           /* Right hand child expression */
+  Fts5ExprNearset *pNear          /* For STRING expressions, the near cluster */
+){
+  Fts5ExprNode *pRet = 0;
+
+  if( pParse->rc==SQLITE_OK ){
+    int nChild = 0;               /* Number of children of returned node */
+    sqlite3_int64 nByte;          /* Bytes of space to allocate for this node */
+ 
+    assert( (eType!=FTS5_STRING && !pNear)
+         || (eType==FTS5_STRING && !pLeft && !pRight)
+    );
+    if( eType==FTS5_STRING && pNear==0 ) return 0;
+    if( eType!=FTS5_STRING && pLeft==0 ) return pRight;
+    if( eType!=FTS5_STRING && pRight==0 ) return pLeft;
+
+    if( eType==FTS5_STRING 
+     && pParse->bPhraseToAnd 
+     && pNear->apPhrase[0]->nTerm>1
+    ){
+      pRet = fts5ParsePhraseToAnd(pParse, pNear);
+    }else{
+      if( eType==FTS5_NOT ){
+        nChild = 2;
+      }else if( eType==FTS5_AND || eType==FTS5_OR ){
+        nChild = 2;
+        if( pLeft->eType==eType ) nChild += pLeft->nChild-1;
+        if( pRight->eType==eType ) nChild += pRight->nChild-1;
+      }
+
+      nByte = sizeof(Fts5ExprNode) + sizeof(Fts5ExprNode*)*(nChild-1);
+      pRet = (Fts5ExprNode*)sqlite3Fts5MallocZero(&pParse->rc, nByte);
+
+      if( pRet ){
+        pRet->eType = eType;
+        pRet->pNear = pNear;
+        fts5ExprAssignXNext(pRet);
+        if( eType==FTS5_STRING ){
+          int iPhrase;
+          for(iPhrase=0; iPhrase<pNear->nPhrase; iPhrase++){
+            pNear->apPhrase[iPhrase]->pNode = pRet;
+            if( pNear->apPhrase[iPhrase]->nTerm==0 ){
+              pRet->xNext = 0;
+              pRet->eType = FTS5_EOF;
+            }
+          }
+
+          if( pParse->pConfig->eDetail!=FTS5_DETAIL_FULL ){
+            Fts5ExprPhrase *pPhrase = pNear->apPhrase[0];
+            if( pNear->nPhrase!=1 
+                || pPhrase->nTerm>1
+                || (pPhrase->nTerm>0 && pPhrase->aTerm[0].bFirst)
+              ){
+              sqlite3Fts5ParseError(pParse, 
+                  "fts5: %s queries are not supported (detail!=full)", 
+                  pNear->nPhrase==1 ? "phrase": "NEAR"
+              );
+              sqlite3_free(pRet);
+              pRet = 0;
+            }
+          }
+        }else{
+          fts5ExprAddChildren(pRet, pLeft);
+          fts5ExprAddChildren(pRet, pRight);
+          if( pRet->iHeight>SQLITE_FTS5_MAX_EXPR_DEPTH ){
+            sqlite3Fts5ParseError(pParse, 
+                "fts5 expression tree is too large (maximum depth %d)", 
+                SQLITE_FTS5_MAX_EXPR_DEPTH
+            );
+            sqlite3_free(pRet);
+            pRet = 0;
+          }
+        }
+      }
+    }
+  }
+
+  if( pRet==0 ){
+    assert( pParse->rc!=SQLITE_OK );
+    sqlite3Fts5ParseNodeFree(pLeft);
+    sqlite3Fts5ParseNodeFree(pRight);
+    sqlite3Fts5ParseNearsetFree(pNear);
+  }
+  return pRet;
+}
+
+static Fts5ExprNode *sqlite3Fts5ParseImplicitAnd(
+  Fts5Parse *pParse,              /* Parse context */
+  Fts5ExprNode *pLeft,            /* Left hand child expression */
+  Fts5ExprNode *pRight            /* Right hand child expression */
+){
+  Fts5ExprNode *pRet = 0;
+  Fts5ExprNode *pPrev;
+
+  if( pParse->rc ){
+    sqlite3Fts5ParseNodeFree(pLeft);
+    sqlite3Fts5ParseNodeFree(pRight);
+  }else{
+
+    assert( pLeft->eType==FTS5_STRING 
+        || pLeft->eType==FTS5_TERM
+        || pLeft->eType==FTS5_EOF
+        || pLeft->eType==FTS5_AND
+    );
+    assert( pRight->eType==FTS5_STRING 
+        || pRight->eType==FTS5_TERM 
+        || pRight->eType==FTS5_EOF 
+    );
+
+    if( pLeft->eType==FTS5_AND ){
+      pPrev = pLeft->apChild[pLeft->nChild-1];
+    }else{
+      pPrev = pLeft;
+    }
+    assert( pPrev->eType==FTS5_STRING 
+        || pPrev->eType==FTS5_TERM 
+        || pPrev->eType==FTS5_EOF 
+        );
+
+    if( pRight->eType==FTS5_EOF ){
+      assert( pParse->apPhrase[pParse->nPhrase-1]==pRight->pNear->apPhrase[0] );
+      sqlite3Fts5ParseNodeFree(pRight);
+      pRet = pLeft;
+      pParse->nPhrase--;
+    }
+    else if( pPrev->eType==FTS5_EOF ){
+      Fts5ExprPhrase **ap;
+
+      if( pPrev==pLeft ){
+        pRet = pRight;
+      }else{
+        pLeft->apChild[pLeft->nChild-1] = pRight;
+        pRet = pLeft;
+      }
+
+      ap = &pParse->apPhrase[pParse->nPhrase-1-pRight->pNear->nPhrase];
+      assert( ap[0]==pPrev->pNear->apPhrase[0] );
+      memmove(ap, &ap[1], sizeof(Fts5ExprPhrase*)*pRight->pNear->nPhrase);
+      pParse->nPhrase--;
+
+      sqlite3Fts5ParseNodeFree(pPrev);
+    }
+    else{
+      pRet = sqlite3Fts5ParseNode(pParse, FTS5_AND, pLeft, pRight, 0);
+    }
+  }
+
+  return pRet;
+}
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+static char *fts5ExprTermPrint(Fts5ExprTerm *pTerm){
+  sqlite3_int64 nByte = 0;
+  Fts5ExprTerm *p;
+  char *zQuoted;
+
+  /* Determine the maximum amount of space required. */
+  for(p=pTerm; p; p=p->pSynonym){
+    nByte += pTerm->nQueryTerm * 2 + 3 + 2;
+  }
+  zQuoted = sqlite3_malloc64(nByte);
+
+  if( zQuoted ){
+    int i = 0;
+    for(p=pTerm; p; p=p->pSynonym){
+      char *zIn = p->pTerm;
+      char *zEnd = &zIn[p->nQueryTerm];
+      zQuoted[i++] = '"';
+      while( zIn<zEnd ){
+        if( *zIn=='"' ) zQuoted[i++] = '"';
+        zQuoted[i++] = *zIn++;
+      }
+      zQuoted[i++] = '"';
+      if( p->pSynonym ) zQuoted[i++] = '|';
+    }
+    if( pTerm->bPrefix ){
+      zQuoted[i++] = ' ';
+      zQuoted[i++] = '*';
+    }
+    zQuoted[i++] = '\0';
+  }
+  return zQuoted;
+}
+
+static char *fts5PrintfAppend(char *zApp, const char *zFmt, ...){
+  char *zNew;
+  va_list ap;
+  va_start(ap, zFmt);
+  zNew = sqlite3_vmprintf(zFmt, ap);
+  va_end(ap);
+  if( zApp && zNew ){
+    char *zNew2 = sqlite3_mprintf("%s%s", zApp, zNew);
+    sqlite3_free(zNew);
+    zNew = zNew2;
+  }
+  sqlite3_free(zApp);
+  return zNew;
+}
+
+/*
+** Compose a tcl-readable representation of expression pExpr. Return a 
+** pointer to a buffer containing that representation. It is the 
+** responsibility of the caller to at some point free the buffer using 
+** sqlite3_free().
+*/
+static char *fts5ExprPrintTcl(
+  Fts5Config *pConfig, 
+  const char *zNearsetCmd,
+  Fts5ExprNode *pExpr
+){
+  char *zRet = 0;
+  if( pExpr->eType==FTS5_STRING || pExpr->eType==FTS5_TERM ){
+    Fts5ExprNearset *pNear = pExpr->pNear;
+    int i; 
+    int iTerm;
+
+    zRet = fts5PrintfAppend(zRet, "%s ", zNearsetCmd);
+    if( zRet==0 ) return 0;
+    if( pNear->pColset ){
+      int *aiCol = pNear->pColset->aiCol;
+      int nCol = pNear->pColset->nCol;
+      if( nCol==1 ){
+        zRet = fts5PrintfAppend(zRet, "-col %d ", aiCol[0]);
+      }else{
+        zRet = fts5PrintfAppend(zRet, "-col {%d", aiCol[0]);
+        for(i=1; i<pNear->pColset->nCol; i++){
+          zRet = fts5PrintfAppend(zRet, " %d", aiCol[i]);
+        }
+        zRet = fts5PrintfAppend(zRet, "} ");
+      }
+      if( zRet==0 ) return 0;
+    }
+
+    if( pNear->nPhrase>1 ){
+      zRet = fts5PrintfAppend(zRet, "-near %d ", pNear->nNear);
+      if( zRet==0 ) return 0;
+    }
+
+    zRet = fts5PrintfAppend(zRet, "--");
+    if( zRet==0 ) return 0;
+
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+
+      zRet = fts5PrintfAppend(zRet, " {");
+      for(iTerm=0; zRet && iTerm<pPhrase->nTerm; iTerm++){
+        Fts5ExprTerm *p = &pPhrase->aTerm[iTerm];
+        zRet = fts5PrintfAppend(zRet, "%s%.*s", iTerm==0?"":" ", 
+            p->nQueryTerm, p->pTerm
+        );
+        if( pPhrase->aTerm[iTerm].bPrefix ){
+          zRet = fts5PrintfAppend(zRet, "*");
+        }
+      }
+
+      if( zRet ) zRet = fts5PrintfAppend(zRet, "}");
+      if( zRet==0 ) return 0;
+    }
+
+  }else if( pExpr->eType==0 ){
+    zRet = sqlite3_mprintf("{}");
+  }else{
+    char const *zOp = 0;
+    int i;
+    switch( pExpr->eType ){
+      case FTS5_AND: zOp = "AND"; break;
+      case FTS5_NOT: zOp = "NOT"; break;
+      default: 
+        assert( pExpr->eType==FTS5_OR );
+        zOp = "OR"; 
+        break;
+    }
+
+    zRet = sqlite3_mprintf("%s", zOp);
+    for(i=0; zRet && i<pExpr->nChild; i++){
+      char *z = fts5ExprPrintTcl(pConfig, zNearsetCmd, pExpr->apChild[i]);
+      if( !z ){
+        sqlite3_free(zRet);
+        zRet = 0;
+      }else{
+        zRet = fts5PrintfAppend(zRet, " [%z]", z);
+      }
+    }
+  }
+
+  return zRet;
+}
+
+static char *fts5ExprPrint(Fts5Config *pConfig, Fts5ExprNode *pExpr){
+  char *zRet = 0;
+  if( pExpr->eType==0 ){
+    return sqlite3_mprintf("\"\"");
+  }else
+  if( pExpr->eType==FTS5_STRING || pExpr->eType==FTS5_TERM ){
+    Fts5ExprNearset *pNear = pExpr->pNear;
+    int i; 
+    int iTerm;
+
+    if( pNear->pColset ){
+      int ii;
+      Fts5Colset *pColset = pNear->pColset;
+      if( pColset->nCol>1 ) zRet = fts5PrintfAppend(zRet, "{");
+      for(ii=0; ii<pColset->nCol; ii++){
+        zRet = fts5PrintfAppend(zRet, "%s%s", 
+            pConfig->azCol[pColset->aiCol[ii]], ii==pColset->nCol-1 ? "" : " "
+        );
+      }
+      if( zRet ){
+        zRet = fts5PrintfAppend(zRet, "%s : ", pColset->nCol>1 ? "}" : "");
+      }
+      if( zRet==0 ) return 0;
+    }
+
+    if( pNear->nPhrase>1 ){
+      zRet = fts5PrintfAppend(zRet, "NEAR(");
+      if( zRet==0 ) return 0;
+    }
+
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      if( i!=0 ){
+        zRet = fts5PrintfAppend(zRet, " ");
+        if( zRet==0 ) return 0;
+      }
+      for(iTerm=0; iTerm<pPhrase->nTerm; iTerm++){
+        char *zTerm = fts5ExprTermPrint(&pPhrase->aTerm[iTerm]);
+        if( zTerm ){
+          zRet = fts5PrintfAppend(zRet, "%s%s", iTerm==0?"":" + ", zTerm);
+          sqlite3_free(zTerm);
+        }
+        if( zTerm==0 || zRet==0 ){
+          sqlite3_free(zRet);
+          return 0;
+        }
+      }
+    }
+
+    if( pNear->nPhrase>1 ){
+      zRet = fts5PrintfAppend(zRet, ", %d)", pNear->nNear);
+      if( zRet==0 ) return 0;
+    }
+
+  }else{
+    char const *zOp = 0;
+    int i;
+
+    switch( pExpr->eType ){
+      case FTS5_AND: zOp = " AND "; break;
+      case FTS5_NOT: zOp = " NOT "; break;
+      default:  
+        assert( pExpr->eType==FTS5_OR );
+        zOp = " OR "; 
+        break;
+    }
+
+    for(i=0; i<pExpr->nChild; i++){
+      char *z = fts5ExprPrint(pConfig, pExpr->apChild[i]);
+      if( z==0 ){
+        sqlite3_free(zRet);
+        zRet = 0;
+      }else{
+        int e = pExpr->apChild[i]->eType;
+        int b = (e!=FTS5_STRING && e!=FTS5_TERM && e!=FTS5_EOF);
+        zRet = fts5PrintfAppend(zRet, "%s%s%z%s", 
+            (i==0 ? "" : zOp),
+            (b?"(":""), z, (b?")":"")
+        );
+      }
+      if( zRet==0 ) break;
+    }
+  }
+
+  return zRet;
+}
+
+/*
+** The implementation of user-defined scalar functions fts5_expr() (bTcl==0)
+** and fts5_expr_tcl() (bTcl!=0).
+*/
+static void fts5ExprFunction(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal,          /* Function arguments */
+  int bTcl
+){
+  Fts5Global *pGlobal = (Fts5Global*)sqlite3_user_data(pCtx);
+  sqlite3 *db = sqlite3_context_db_handle(pCtx);
+  const char *zExpr = 0;
+  char *zErr = 0;
+  Fts5Expr *pExpr = 0;
+  int rc;
+  int i;
+
+  const char **azConfig;          /* Array of arguments for Fts5Config */
+  const char *zNearsetCmd = "nearset";
+  int nConfig;                    /* Size of azConfig[] */
+  Fts5Config *pConfig = 0;
+  int iArg = 1;
+
+  if( nArg<1 ){
+    zErr = sqlite3_mprintf("wrong number of arguments to function %s",
+        bTcl ? "fts5_expr_tcl" : "fts5_expr"
+    );
+    sqlite3_result_error(pCtx, zErr, -1);
+    sqlite3_free(zErr);
+    return;
+  }
+
+  if( bTcl && nArg>1 ){
+    zNearsetCmd = (const char*)sqlite3_value_text(apVal[1]);
+    iArg = 2;
+  }
+
+  nConfig = 3 + (nArg-iArg);
+  azConfig = (const char**)sqlite3_malloc64(sizeof(char*) * nConfig);
+  if( azConfig==0 ){
+    sqlite3_result_error_nomem(pCtx);
+    return;
+  }
+  azConfig[0] = 0;
+  azConfig[1] = "main";
+  azConfig[2] = "tbl";
+  for(i=3; iArg<nArg; iArg++){
+    const char *z = (const char*)sqlite3_value_text(apVal[iArg]);
+    azConfig[i++] = (z ? z : "");
+  }
+
+  zExpr = (const char*)sqlite3_value_text(apVal[0]);
+  if( zExpr==0 ) zExpr = "";
+
+  rc = sqlite3Fts5ConfigParse(pGlobal, db, nConfig, azConfig, &pConfig, &zErr);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5ExprNew(pConfig, 0, pConfig->nCol, zExpr, &pExpr, &zErr);
+  }
+  if( rc==SQLITE_OK ){
+    char *zText;
+    if( pExpr->pRoot->xNext==0 ){
+      zText = sqlite3_mprintf("");
+    }else if( bTcl ){
+      zText = fts5ExprPrintTcl(pConfig, zNearsetCmd, pExpr->pRoot);
+    }else{
+      zText = fts5ExprPrint(pConfig, pExpr->pRoot);
+    }
+    if( zText==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      sqlite3_result_text(pCtx, zText, -1, SQLITE_TRANSIENT);
+      sqlite3_free(zText);
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    if( zErr ){
+      sqlite3_result_error(pCtx, zErr, -1);
+      sqlite3_free(zErr);
+    }else{
+      sqlite3_result_error_code(pCtx, rc);
+    }
+  }
+  sqlite3_free((void *)azConfig);
+  sqlite3Fts5ConfigFree(pConfig);
+  sqlite3Fts5ExprFree(pExpr);
+}
+
+static void fts5ExprFunctionHr(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  fts5ExprFunction(pCtx, nArg, apVal, 0);
+}
+static void fts5ExprFunctionTcl(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  fts5ExprFunction(pCtx, nArg, apVal, 1);
+}
+
+/*
+** The implementation of an SQLite user-defined-function that accepts a
+** single integer as an argument. If the integer is an alpha-numeric 
+** unicode code point, 1 is returned. Otherwise 0.
+*/
+static void fts5ExprIsAlnum(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  int iCode;
+  u8 aArr[32];
+  if( nArg!=1 ){
+    sqlite3_result_error(pCtx, 
+        "wrong number of arguments to function fts5_isalnum", -1
+    );
+    return;
+  }
+  memset(aArr, 0, sizeof(aArr));
+  sqlite3Fts5UnicodeCatParse("L*", aArr);
+  sqlite3Fts5UnicodeCatParse("N*", aArr);
+  sqlite3Fts5UnicodeCatParse("Co", aArr);
+  iCode = sqlite3_value_int(apVal[0]);
+  sqlite3_result_int(pCtx, aArr[sqlite3Fts5UnicodeCategory((u32)iCode)]);
+}
+
+static void fts5ExprFold(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  if( nArg!=1 && nArg!=2 ){
+    sqlite3_result_error(pCtx, 
+        "wrong number of arguments to function fts5_fold", -1
+    );
+  }else{
+    int iCode;
+    int bRemoveDiacritics = 0;
+    iCode = sqlite3_value_int(apVal[0]);
+    if( nArg==2 ) bRemoveDiacritics = sqlite3_value_int(apVal[1]);
+    sqlite3_result_int(pCtx, sqlite3Fts5UnicodeFold(iCode, bRemoveDiacritics));
+  }
+}
+#endif /* if SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+/*
+** This is called during initialization to register the fts5_expr() scalar
+** UDF with the SQLite handle passed as the only argument.
+*/
+static int sqlite3Fts5ExprInit(Fts5Global *pGlobal, sqlite3 *db){
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+  struct Fts5ExprFunc {
+    const char *z;
+    void (*x)(sqlite3_context*,int,sqlite3_value**);
+  } aFunc[] = {
+    { "fts5_expr",     fts5ExprFunctionHr },
+    { "fts5_expr_tcl", fts5ExprFunctionTcl },
+    { "fts5_isalnum",  fts5ExprIsAlnum },
+    { "fts5_fold",     fts5ExprFold },
+  };
+  int i;
+  int rc = SQLITE_OK;
+  void *pCtx = (void*)pGlobal;
+
+  for(i=0; rc==SQLITE_OK && i<ArraySize(aFunc); i++){
+    struct Fts5ExprFunc *p = &aFunc[i];
+    rc = sqlite3_create_function(db, p->z, -1, SQLITE_UTF8, pCtx, p->x, 0, 0);
+  }
+#else
+  int rc = SQLITE_OK;
+  UNUSED_PARAM2(pGlobal,db);
+#endif
+
+  /* Avoid warnings indicating that sqlite3Fts5ParserTrace() and
+  ** sqlite3Fts5ParserFallback() are unused */
+#ifndef NDEBUG
+  (void)sqlite3Fts5ParserTrace;
+#endif
+  (void)sqlite3Fts5ParserFallback;
+
+  return rc;
+}
+
+/*
+** Return the number of phrases in expression pExpr.
+*/
+static int sqlite3Fts5ExprPhraseCount(Fts5Expr *pExpr){
+  return (pExpr ? pExpr->nPhrase : 0);
+}
+
+/*
+** Return the number of terms in the iPhrase'th phrase in pExpr.
+*/
+static int sqlite3Fts5ExprPhraseSize(Fts5Expr *pExpr, int iPhrase){
+  if( iPhrase<0 || iPhrase>=pExpr->nPhrase ) return 0;
+  return pExpr->apExprPhrase[iPhrase]->nTerm;
+}
+
+/*
+** This function is used to access the current position list for phrase
+** iPhrase.
+*/
+static int sqlite3Fts5ExprPoslist(Fts5Expr *pExpr, int iPhrase, const u8 **pa){
+  int nRet;
+  Fts5ExprPhrase *pPhrase = pExpr->apExprPhrase[iPhrase];
+  Fts5ExprNode *pNode = pPhrase->pNode;
+  if( pNode->bEof==0 && pNode->iRowid==pExpr->pRoot->iRowid ){
+    *pa = pPhrase->poslist.p;
+    nRet = pPhrase->poslist.n;
+  }else{
+    *pa = 0;
+    nRet = 0;
+  }
+  return nRet;
+}
+
+struct Fts5PoslistPopulator {
+  Fts5PoslistWriter writer;
+  int bOk;                        /* True if ok to populate */
+  int bMiss;
+};
+
+/*
+** Clear the position lists associated with all phrases in the expression
+** passed as the first argument. Argument bLive is true if the expression
+** might be pointing to a real entry, otherwise it has just been reset.
+**
+** At present this function is only used for detail=col and detail=none
+** fts5 tables. This implies that all phrases must be at most 1 token
+** in size, as phrase matches are not supported without detail=full.
+*/
+static Fts5PoslistPopulator *sqlite3Fts5ExprClearPoslists(Fts5Expr *pExpr, int bLive){
+  Fts5PoslistPopulator *pRet;
+  pRet = sqlite3_malloc64(sizeof(Fts5PoslistPopulator)*pExpr->nPhrase);
+  if( pRet ){
+    int i;
+    memset(pRet, 0, sizeof(Fts5PoslistPopulator)*pExpr->nPhrase);
+    for(i=0; i<pExpr->nPhrase; i++){
+      Fts5Buffer *pBuf = &pExpr->apExprPhrase[i]->poslist;
+      Fts5ExprNode *pNode = pExpr->apExprPhrase[i]->pNode;
+      assert( pExpr->apExprPhrase[i]->nTerm<=1 );
+      if( bLive && 
+          (pBuf->n==0 || pNode->iRowid!=pExpr->pRoot->iRowid || pNode->bEof)
+      ){
+        pRet[i].bMiss = 1;
+      }else{
+        pBuf->n = 0;
+      }
+    }
+  }
+  return pRet;
+}
+
+struct Fts5ExprCtx {
+  Fts5Expr *pExpr;
+  Fts5PoslistPopulator *aPopulator;
+  i64 iOff;
+};
+typedef struct Fts5ExprCtx Fts5ExprCtx;
+
+/*
+** TODO: Make this more efficient!
+*/
+static int fts5ExprColsetTest(Fts5Colset *pColset, int iCol){
+  int i;
+  for(i=0; i<pColset->nCol; i++){
+    if( pColset->aiCol[i]==iCol ) return 1;
+  }
+  return 0;
+}
+
+/*
+** pToken is a buffer nToken bytes in size that may or may not contain
+** an embedded 0x00 byte. If it does, return the number of bytes in
+** the buffer before the 0x00. If it does not, return nToken.
+*/
+static int fts5QueryTerm(const char *pToken, int nToken){
+  int ii;
+  for(ii=0; ii<nToken && pToken[ii]; ii++){}
+  return ii;
+}
+
+static int fts5ExprPopulatePoslistsCb(
+  void *pCtx,                /* Copy of 2nd argument to xTokenize() */
+  int tflags,                /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,        /* Pointer to buffer containing token */
+  int nToken,                /* Size of token in bytes */
+  int iUnused1,              /* Byte offset of token within input text */
+  int iUnused2               /* Byte offset of end of token within input text */
+){
+  Fts5ExprCtx *p = (Fts5ExprCtx*)pCtx;
+  Fts5Expr *pExpr = p->pExpr;
+  int i;
+  int nQuery = nToken;
+  i64 iRowid = pExpr->pRoot->iRowid;
+
+  UNUSED_PARAM2(iUnused1, iUnused2);
+
+  if( nQuery>FTS5_MAX_TOKEN_SIZE ) nQuery = FTS5_MAX_TOKEN_SIZE;
+  if( pExpr->pConfig->bTokendata ){
+    nQuery = fts5QueryTerm(pToken, nQuery);
+  }
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 ) p->iOff++;
+  for(i=0; i<pExpr->nPhrase; i++){
+    Fts5ExprTerm *pT;
+    if( p->aPopulator[i].bOk==0 ) continue;
+    for(pT=&pExpr->apExprPhrase[i]->aTerm[0]; pT; pT=pT->pSynonym){
+      if( (pT->nQueryTerm==nQuery || (pT->nQueryTerm<nQuery && pT->bPrefix))
+       && memcmp(pT->pTerm, pToken, pT->nQueryTerm)==0
+      ){
+        int rc = sqlite3Fts5PoslistWriterAppend(
+            &pExpr->apExprPhrase[i]->poslist, &p->aPopulator[i].writer, p->iOff
+        );
+        if( rc==SQLITE_OK && pExpr->pConfig->bTokendata && !pT->bPrefix ){
+          int iCol = p->iOff>>32;
+          int iTokOff = p->iOff & 0x7FFFFFFF;
+          rc = sqlite3Fts5IndexIterWriteTokendata(
+              pT->pIter, pToken, nToken, iRowid, iCol, iTokOff
+          );
+        }
+        if( rc ) return rc;
+        break;
+      }
+    }
+  }
+  return SQLITE_OK;
+}
+
+static int sqlite3Fts5ExprPopulatePoslists(
+  Fts5Config *pConfig,
+  Fts5Expr *pExpr, 
+  Fts5PoslistPopulator *aPopulator,
+  int iCol, 
+  const char *z, int n
+){
+  int i;
+  Fts5ExprCtx sCtx;
+  sCtx.pExpr = pExpr;
+  sCtx.aPopulator = aPopulator;
+  sCtx.iOff = (((i64)iCol) << 32) - 1;
+
+  for(i=0; i<pExpr->nPhrase; i++){
+    Fts5ExprNode *pNode = pExpr->apExprPhrase[i]->pNode;
+    Fts5Colset *pColset = pNode->pNear->pColset;
+    if( (pColset && 0==fts5ExprColsetTest(pColset, iCol)) 
+     || aPopulator[i].bMiss
+    ){
+      aPopulator[i].bOk = 0;
+    }else{
+      aPopulator[i].bOk = 1;
+    }
+  }
+
+  return sqlite3Fts5Tokenize(pConfig, 
+      FTS5_TOKENIZE_DOCUMENT, z, n, (void*)&sCtx, fts5ExprPopulatePoslistsCb
+  );
+}
+
+static void fts5ExprClearPoslists(Fts5ExprNode *pNode){
+  if( pNode->eType==FTS5_TERM || pNode->eType==FTS5_STRING ){
+    pNode->pNear->apPhrase[0]->poslist.n = 0;
+  }else{
+    int i;
+    for(i=0; i<pNode->nChild; i++){
+      fts5ExprClearPoslists(pNode->apChild[i]);
+    }
+  }
+}
+
+static int fts5ExprCheckPoslists(Fts5ExprNode *pNode, i64 iRowid){
+  pNode->iRowid = iRowid;
+  pNode->bEof = 0;
+  switch( pNode->eType ){
+    case FTS5_TERM:
+    case FTS5_STRING:
+      return (pNode->pNear->apPhrase[0]->poslist.n>0);
+
+    case FTS5_AND: {
+      int i;
+      for(i=0; i<pNode->nChild; i++){
+        if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid)==0 ){
+          fts5ExprClearPoslists(pNode);
+          return 0;
+        }
+      }
+      break;
+    }
+
+    case FTS5_OR: {
+      int i;
+      int bRet = 0;
+      for(i=0; i<pNode->nChild; i++){
+        if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid) ){
+          bRet = 1;
+        }
+      }
+      return bRet;
+    }
+
+    default: {
+      assert( pNode->eType==FTS5_NOT );
+      if( 0==fts5ExprCheckPoslists(pNode->apChild[0], iRowid)
+          || 0!=fts5ExprCheckPoslists(pNode->apChild[1], iRowid)
+        ){
+        fts5ExprClearPoslists(pNode);
+        return 0;
+      }
+      break;
+    }
+  }
+  return 1;
+}
+
+static void sqlite3Fts5ExprCheckPoslists(Fts5Expr *pExpr, i64 iRowid){
+  fts5ExprCheckPoslists(pExpr->pRoot, iRowid);
+}
+
+/*
+** This function is only called for detail=columns tables. 
+*/
+static int sqlite3Fts5ExprPhraseCollist(
+  Fts5Expr *pExpr, 
+  int iPhrase, 
+  const u8 **ppCollist, 
+  int *pnCollist
+){
+  Fts5ExprPhrase *pPhrase = pExpr->apExprPhrase[iPhrase];
+  Fts5ExprNode *pNode = pPhrase->pNode;
+  int rc = SQLITE_OK;
+
+  assert( iPhrase>=0 && iPhrase<pExpr->nPhrase );
+  assert( pExpr->pConfig->eDetail==FTS5_DETAIL_COLUMNS );
+
+  if( pNode->bEof==0 
+   && pNode->iRowid==pExpr->pRoot->iRowid 
+   && pPhrase->poslist.n>0
+  ){
+    Fts5ExprTerm *pTerm = &pPhrase->aTerm[0];
+    if( pTerm->pSynonym ){
+      Fts5Buffer *pBuf = (Fts5Buffer*)&pTerm->pSynonym[1];
+      rc = fts5ExprSynonymList(
+          pTerm, pNode->iRowid, pBuf, (u8**)ppCollist, pnCollist
+      );
+    }else{
+      *ppCollist = pPhrase->aTerm[0].pIter->pData;
+      *pnCollist = pPhrase->aTerm[0].pIter->nData;
+    }
+  }else{
+    *ppCollist = 0;
+    *pnCollist = 0;
+  }
+
+  return rc;
+}
+
+/*
+** Does the work of the fts5_api.xQueryToken() API method.
+*/
+static int sqlite3Fts5ExprQueryToken(
+  Fts5Expr *pExpr, 
+  int iPhrase, 
+  int iToken, 
+  const char **ppOut, 
+  int *pnOut
+){
+  Fts5ExprPhrase *pPhrase = 0;
+
+  if( iPhrase<0 || iPhrase>=pExpr->nPhrase ){
+    return SQLITE_RANGE;
+  }
+  pPhrase = pExpr->apExprPhrase[iPhrase];
+  if( iToken<0 || iToken>=pPhrase->nTerm ){
+    return SQLITE_RANGE;
+  }
+
+  *ppOut = pPhrase->aTerm[iToken].pTerm;
+  *pnOut = pPhrase->aTerm[iToken].nFullTerm;
+  return SQLITE_OK;
+}
+
+/*
+** Does the work of the fts5_api.xInstToken() API method.
+*/
+static int sqlite3Fts5ExprInstToken(
+  Fts5Expr *pExpr, 
+  i64 iRowid,
+  int iPhrase, 
+  int iCol, 
+  int iOff, 
+  int iToken, 
+  const char **ppOut, 
+  int *pnOut
+){
+  Fts5ExprPhrase *pPhrase = 0;
+  Fts5ExprTerm *pTerm = 0;
+  int rc = SQLITE_OK;
+
+  if( iPhrase<0 || iPhrase>=pExpr->nPhrase ){
+    return SQLITE_RANGE;
+  }
+  pPhrase = pExpr->apExprPhrase[iPhrase];
+  if( iToken<0 || iToken>=pPhrase->nTerm ){
+    return SQLITE_RANGE;
+  }
+  pTerm = &pPhrase->aTerm[iToken];
+  if( pTerm->bPrefix==0 ){
+    if( pExpr->pConfig->bTokendata ){
+      rc = sqlite3Fts5IterToken(
+          pTerm->pIter, iRowid, iCol, iOff+iToken, ppOut, pnOut
+      );
+    }else{
+      *ppOut = pTerm->pTerm;
+      *pnOut = pTerm->nFullTerm;
+    }
+  }
+  return rc;
+}
+
+/*
+** Clear the token mappings for all Fts5IndexIter objects mannaged by 
+** the expression passed as the only argument.
+*/
+static void sqlite3Fts5ExprClearTokens(Fts5Expr *pExpr){
+  int ii;
+  for(ii=0; ii<pExpr->nPhrase; ii++){
+    Fts5ExprTerm *pT;
+    for(pT=&pExpr->apExprPhrase[ii]->aTerm[0]; pT; pT=pT->pSynonym){
+      sqlite3Fts5IndexIterClearTokendata(pT->pIter);
+    }
+  }
+}
+
+#line 1 "fts5_hash.c"
+/*
+** 2014 August 11
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+
+
+
+/* #include "fts5Int.h" */
+
+typedef struct Fts5HashEntry Fts5HashEntry;
+
+/*
+** This file contains the implementation of an in-memory hash table used
+** to accumuluate "term -> doclist" content before it is flused to a level-0
+** segment.
+*/
+
+
+struct Fts5Hash {
+  int eDetail;                    /* Copy of Fts5Config.eDetail */
+  int *pnByte;                    /* Pointer to bytes counter */
+  int nEntry;                     /* Number of entries currently in hash */
+  int nSlot;                      /* Size of aSlot[] array */
+  Fts5HashEntry *pScan;           /* Current ordered scan item */
+  Fts5HashEntry **aSlot;          /* Array of hash slots */
+};
+
+/*
+** Each entry in the hash table is represented by an object of the 
+** following type. Each object, its key, and its current data are stored 
+** in a single memory allocation. The key immediately follows the object 
+** in memory. The position list data immediately follows the key data 
+** in memory.
+**
+** The key is Fts5HashEntry.nKey bytes in size. It consists of a single
+** byte identifying the index (either the main term index or a prefix-index),
+** followed by the term data. For example: "0token". There is no 
+** nul-terminator - in this case nKey=6.
+**
+** The data that follows the key is in a similar, but not identical format
+** to the doclist data stored in the database. It is:
+**
+**   * Rowid, as a varint
+**   * Position list, without 0x00 terminator.
+**   * Size of previous position list and rowid, as a 4 byte
+**     big-endian integer.
+**
+** iRowidOff:
+**   Offset of last rowid written to data area. Relative to first byte of
+**   structure.
+**
+** nData:
+**   Bytes of data written since iRowidOff.
+*/
+struct Fts5HashEntry {
+  Fts5HashEntry *pHashNext;       /* Next hash entry with same hash-key */
+  Fts5HashEntry *pScanNext;       /* Next entry in sorted order */
+  
+  int nAlloc;                     /* Total size of allocation */
+  int iSzPoslist;                 /* Offset of space for 4-byte poslist size */
+  int nData;                      /* Total bytes of data (incl. structure) */
+  int nKey;                       /* Length of key in bytes */
+  u8 bDel;                        /* Set delete-flag @ iSzPoslist */
+  u8 bContent;                    /* Set content-flag (detail=none mode) */
+  i16 iCol;                       /* Column of last value written */
+  int iPos;                       /* Position of last value written */
+  i64 iRowid;                     /* Rowid of last value written */
+};
+
+/*
+** Eqivalent to:
+**
+**   char *fts5EntryKey(Fts5HashEntry *pEntry){ return zKey; }
+*/
+#define fts5EntryKey(p) ( ((char *)(&(p)[1])) )
+
+
+/*
+** Allocate a new hash table.
+*/
+static int sqlite3Fts5HashNew(Fts5Config *pConfig, Fts5Hash **ppNew, int *pnByte){
+  int rc = SQLITE_OK;
+  Fts5Hash *pNew;
+
+  *ppNew = pNew = (Fts5Hash*)sqlite3_malloc(sizeof(Fts5Hash));
+  if( pNew==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    sqlite3_int64 nByte;
+    memset(pNew, 0, sizeof(Fts5Hash));
+    pNew->pnByte = pnByte;
+    pNew->eDetail = pConfig->eDetail;
+
+    pNew->nSlot = 1024;
+    nByte = sizeof(Fts5HashEntry*) * pNew->nSlot;
+    pNew->aSlot = (Fts5HashEntry**)sqlite3_malloc64(nByte);
+    if( pNew->aSlot==0 ){
+      sqlite3_free(pNew);
+      *ppNew = 0;
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(pNew->aSlot, 0, (size_t)nByte);
+    }
+  }
+  return rc;
+}
+
+/*
+** Free a hash table object.
+*/
+static void sqlite3Fts5HashFree(Fts5Hash *pHash){
+  if( pHash ){
+    sqlite3Fts5HashClear(pHash);
+    sqlite3_free(pHash->aSlot);
+    sqlite3_free(pHash);
+  }
+}
+
+/*
+** Empty (but do not delete) a hash table.
+*/
+static void sqlite3Fts5HashClear(Fts5Hash *pHash){
+  int i;
+  for(i=0; i<pHash->nSlot; i++){
+    Fts5HashEntry *pNext;
+    Fts5HashEntry *pSlot;
+    for(pSlot=pHash->aSlot[i]; pSlot; pSlot=pNext){
+      pNext = pSlot->pHashNext;
+      sqlite3_free(pSlot);
+    }
+  }
+  memset(pHash->aSlot, 0, pHash->nSlot * sizeof(Fts5HashEntry*));
+  pHash->nEntry = 0;
+}
+
+static unsigned int fts5HashKey(int nSlot, const u8 *p, int n){
+  int i;
+  unsigned int h = 13;
+  for(i=n-1; i>=0; i--){
+    h = (h << 3) ^ h ^ p[i];
+  }
+  return (h % nSlot);
+}
+
+static unsigned int fts5HashKey2(int nSlot, u8 b, const u8 *p, int n){
+  int i;
+  unsigned int h = 13;
+  for(i=n-1; i>=0; i--){
+    h = (h << 3) ^ h ^ p[i];
+  }
+  h = (h << 3) ^ h ^ b;
+  return (h % nSlot);
+}
+
+/*
+** Resize the hash table by doubling the number of slots.
+*/
+static int fts5HashResize(Fts5Hash *pHash){
+  int nNew = pHash->nSlot*2;
+  int i;
+  Fts5HashEntry **apNew;
+  Fts5HashEntry **apOld = pHash->aSlot;
+
+  apNew = (Fts5HashEntry**)sqlite3_malloc64(nNew*sizeof(Fts5HashEntry*));
+  if( !apNew ) return SQLITE_NOMEM;
+  memset(apNew, 0, nNew*sizeof(Fts5HashEntry*));
+
+  for(i=0; i<pHash->nSlot; i++){
+    while( apOld[i] ){
+      unsigned int iHash;
+      Fts5HashEntry *p = apOld[i];
+      apOld[i] = p->pHashNext;
+      iHash = fts5HashKey(nNew, (u8*)fts5EntryKey(p), p->nKey);
+      p->pHashNext = apNew[iHash];
+      apNew[iHash] = p;
+    }
+  }
+
+  sqlite3_free(apOld);
+  pHash->nSlot = nNew;
+  pHash->aSlot = apNew;
+  return SQLITE_OK;
+}
+
+static int fts5HashAddPoslistSize(
+  Fts5Hash *pHash, 
+  Fts5HashEntry *p,
+  Fts5HashEntry *p2
+){
+  int nRet = 0;
+  if( p->iSzPoslist ){
+    u8 *pPtr = p2 ? (u8*)p2 : (u8*)p;
+    int nData = p->nData;
+    if( pHash->eDetail==FTS5_DETAIL_NONE ){
+      assert( nData==p->iSzPoslist );
+      if( p->bDel ){
+        pPtr[nData++] = 0x00;
+        if( p->bContent ){
+          pPtr[nData++] = 0x00;
+        }
+      }
+    }else{
+      int nSz = (nData - p->iSzPoslist - 1);       /* Size in bytes */
+      int nPos = nSz*2 + p->bDel;                     /* Value of nPos field */
+
+      assert( p->bDel==0 || p->bDel==1 );
+      if( nPos<=127 ){
+        pPtr[p->iSzPoslist] = (u8)nPos;
+      }else{
+        int nByte = sqlite3Fts5GetVarintLen((u32)nPos);
+        memmove(&pPtr[p->iSzPoslist + nByte], &pPtr[p->iSzPoslist + 1], nSz);
+        sqlite3Fts5PutVarint(&pPtr[p->iSzPoslist], nPos);
+        nData += (nByte-1);
+      }
+    }
+
+    nRet = nData - p->nData;
+    if( p2==0 ){
+      p->iSzPoslist = 0;
+      p->bDel = 0;
+      p->bContent = 0;
+      p->nData = nData;
+    }
+  }
+  return nRet;
+}
+
+/*
+** Add an entry to the in-memory hash table. The key is the concatenation
+** of bByte and (pToken/nToken). The value is (iRowid/iCol/iPos).
+**
+**     (bByte || pToken) -> (iRowid,iCol,iPos)
+**
+** Or, if iCol is negative, then the value is a delete marker.
+*/
+static int sqlite3Fts5HashWrite(
+  Fts5Hash *pHash,
+  i64 iRowid,                     /* Rowid for this entry */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  char bByte,                     /* First byte of token */
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+){
+  unsigned int iHash;
+  Fts5HashEntry *p;
+  u8 *pPtr;
+  int nIncr = 0;                  /* Amount to increment (*pHash->pnByte) by */
+  int bNew;                       /* If non-delete entry should be written */
+  
+  bNew = (pHash->eDetail==FTS5_DETAIL_FULL);
+
+  /* Attempt to locate an existing hash entry */
+  iHash = fts5HashKey2(pHash->nSlot, (u8)bByte, (const u8*)pToken, nToken);
+  for(p=pHash->aSlot[iHash]; p; p=p->pHashNext){
+    char *zKey = fts5EntryKey(p);
+    if( zKey[0]==bByte 
+     && p->nKey==nToken+1
+     && memcmp(&zKey[1], pToken, nToken)==0 
+    ){
+      break;
+    }
+  }
+
+  /* If an existing hash entry cannot be found, create a new one. */
+  if( p==0 ){
+    /* Figure out how much space to allocate */
+    char *zKey;
+    sqlite3_int64 nByte = sizeof(Fts5HashEntry) + (nToken+1) + 1 + 64;
+    if( nByte<128 ) nByte = 128;
+
+    /* Grow the Fts5Hash.aSlot[] array if necessary. */
+    if( (pHash->nEntry*2)>=pHash->nSlot ){
+      int rc = fts5HashResize(pHash);
+      if( rc!=SQLITE_OK ) return rc;
+      iHash = fts5HashKey2(pHash->nSlot, (u8)bByte, (const u8*)pToken, nToken);
+    }
+
+    /* Allocate new Fts5HashEntry and add it to the hash table. */
+    p = (Fts5HashEntry*)sqlite3_malloc64(nByte);
+    if( !p ) return SQLITE_NOMEM;
+    memset(p, 0, sizeof(Fts5HashEntry));
+    p->nAlloc = (int)nByte;
+    zKey = fts5EntryKey(p);
+    zKey[0] = bByte;
+    memcpy(&zKey[1], pToken, nToken);
+    assert( iHash==fts5HashKey(pHash->nSlot, (u8*)zKey, nToken+1) );
+    p->nKey = nToken+1;
+    zKey[nToken+1] = '\0';
+    p->nData = nToken+1 + sizeof(Fts5HashEntry);
+    p->pHashNext = pHash->aSlot[iHash];
+    pHash->aSlot[iHash] = p;
+    pHash->nEntry++;
+
+    /* Add the first rowid field to the hash-entry */
+    p->nData += sqlite3Fts5PutVarint(&((u8*)p)[p->nData], iRowid);
+    p->iRowid = iRowid;
+
+    p->iSzPoslist = p->nData;
+    if( pHash->eDetail!=FTS5_DETAIL_NONE ){
+      p->nData += 1;
+      p->iCol = (pHash->eDetail==FTS5_DETAIL_FULL ? 0 : -1);
+    }
+
+  }else{
+
+    /* Appending to an existing hash-entry. Check that there is enough 
+    ** space to append the largest possible new entry. Worst case scenario 
+    ** is:
+    **
+    **     + 9 bytes for a new rowid,
+    **     + 4 byte reserved for the "poslist size" varint.
+    **     + 1 byte for a "new column" byte,
+    **     + 3 bytes for a new column number (16-bit max) as a varint,
+    **     + 5 bytes for the new position offset (32-bit max).
+    */
+    if( (p->nAlloc - p->nData) < (9 + 4 + 1 + 3 + 5) ){
+      sqlite3_int64 nNew = p->nAlloc * 2;
+      Fts5HashEntry *pNew;
+      Fts5HashEntry **pp;
+      pNew = (Fts5HashEntry*)sqlite3_realloc64(p, nNew);
+      if( pNew==0 ) return SQLITE_NOMEM;
+      pNew->nAlloc = (int)nNew;
+      for(pp=&pHash->aSlot[iHash]; *pp!=p; pp=&(*pp)->pHashNext);
+      *pp = pNew;
+      p = pNew;
+    }
+    nIncr -= p->nData;
+  }
+  assert( (p->nAlloc - p->nData) >= (9 + 4 + 1 + 3 + 5) );
+
+  pPtr = (u8*)p;
+
+  /* If this is a new rowid, append the 4-byte size field for the previous
+  ** entry, and the new rowid for this entry.  */
+  if( iRowid!=p->iRowid ){
+    u64 iDiff = (u64)iRowid - (u64)p->iRowid;
+    fts5HashAddPoslistSize(pHash, p, 0);
+    p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iDiff);
+    p->iRowid = iRowid;
+    bNew = 1;
+    p->iSzPoslist = p->nData;
+    if( pHash->eDetail!=FTS5_DETAIL_NONE ){
+      p->nData += 1;
+      p->iCol = (pHash->eDetail==FTS5_DETAIL_FULL ? 0 : -1);
+      p->iPos = 0;
+    }
+  }
+
+  if( iCol>=0 ){
+    if( pHash->eDetail==FTS5_DETAIL_NONE ){
+      p->bContent = 1;
+    }else{
+      /* Append a new column value, if necessary */
+      assert_nc( iCol>=p->iCol );
+      if( iCol!=p->iCol ){
+        if( pHash->eDetail==FTS5_DETAIL_FULL ){
+          pPtr[p->nData++] = 0x01;
+          p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iCol);
+          p->iCol = (i16)iCol;
+          p->iPos = 0;
+        }else{
+          bNew = 1;
+          p->iCol = (i16)(iPos = iCol);
+        }
+      }
+
+      /* Append the new position offset, if necessary */
+      if( bNew ){
+        p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iPos - p->iPos + 2);
+        p->iPos = iPos;
+      }
+    }
+  }else{
+    /* This is a delete. Set the delete flag. */
+    p->bDel = 1;
+  }
+
+  nIncr += p->nData;
+  *pHash->pnByte += nIncr;
+  return SQLITE_OK;
+}
+
+
+/*
+** Arguments pLeft and pRight point to linked-lists of hash-entry objects,
+** each sorted in key order. This function merges the two lists into a
+** single list and returns a pointer to its first element.
+*/
+static Fts5HashEntry *fts5HashEntryMerge(
+  Fts5HashEntry *pLeft,
+  Fts5HashEntry *pRight
+){
+  Fts5HashEntry *p1 = pLeft;
+  Fts5HashEntry *p2 = pRight;
+  Fts5HashEntry *pRet = 0;
+  Fts5HashEntry **ppOut = &pRet;
+
+  while( p1 || p2 ){
+    if( p1==0 ){
+      *ppOut = p2;
+      p2 = 0;
+    }else if( p2==0 ){
+      *ppOut = p1;
+      p1 = 0;
+    }else{
+      char *zKey1 = fts5EntryKey(p1);
+      char *zKey2 = fts5EntryKey(p2);
+      int nMin = MIN(p1->nKey, p2->nKey);
+
+      int cmp = memcmp(zKey1, zKey2, nMin);
+      if( cmp==0 ){
+        cmp = p1->nKey - p2->nKey;
+      }
+      assert( cmp!=0 );
+
+      if( cmp>0 ){
+        /* p2 is smaller */
+        *ppOut = p2;
+        ppOut = &p2->pScanNext;
+        p2 = p2->pScanNext;
+      }else{
+        /* p1 is smaller */
+        *ppOut = p1;
+        ppOut = &p1->pScanNext;
+        p1 = p1->pScanNext;
+      }
+      *ppOut = 0;
+    }
+  }
+
+  return pRet;
+}
+
+/*
+** Link all tokens from hash table iHash into a list in sorted order. The
+** tokens are not removed from the hash table.
+*/
+static int fts5HashEntrySort(
+  Fts5Hash *pHash, 
+  const char *pTerm, int nTerm,   /* Query prefix, if any */
+  Fts5HashEntry **ppSorted
+){
+  const int nMergeSlot = 32;
+  Fts5HashEntry **ap;
+  Fts5HashEntry *pList;
+  int iSlot;
+  int i;
+
+  *ppSorted = 0;
+  ap = sqlite3_malloc64(sizeof(Fts5HashEntry*) * nMergeSlot);
+  if( !ap ) return SQLITE_NOMEM;
+  memset(ap, 0, sizeof(Fts5HashEntry*) * nMergeSlot);
+
+  for(iSlot=0; iSlot<pHash->nSlot; iSlot++){
+    Fts5HashEntry *pIter;
+    for(pIter=pHash->aSlot[iSlot]; pIter; pIter=pIter->pHashNext){
+      if( pTerm==0 
+       || (pIter->nKey>=nTerm && 0==memcmp(fts5EntryKey(pIter), pTerm, nTerm))
+      ){
+        Fts5HashEntry *pEntry = pIter;
+        pEntry->pScanNext = 0;
+        for(i=0; ap[i]; i++){
+          pEntry = fts5HashEntryMerge(pEntry, ap[i]);
+          ap[i] = 0;
+        }
+        ap[i] = pEntry;
+      }
+    }
+  }
+
+  pList = 0;
+  for(i=0; i<nMergeSlot; i++){
+    pList = fts5HashEntryMerge(pList, ap[i]);
+  }
+
+  sqlite3_free(ap);
+  *ppSorted = pList;
+  return SQLITE_OK;
+}
+
+/*
+** Query the hash table for a doclist associated with term pTerm/nTerm.
+*/
+static int sqlite3Fts5HashQuery(
+  Fts5Hash *pHash,                /* Hash table to query */
+  int nPre,
+  const char *pTerm, int nTerm,   /* Query term */
+  void **ppOut,                   /* OUT: Pointer to new object */
+  int *pnDoclist                  /* OUT: Size of doclist in bytes */
+){
+  unsigned int iHash = fts5HashKey(pHash->nSlot, (const u8*)pTerm, nTerm);
+  char *zKey = 0;
+  Fts5HashEntry *p;
+
+  for(p=pHash->aSlot[iHash]; p; p=p->pHashNext){
+    zKey = fts5EntryKey(p);
+    if( nTerm==p->nKey && memcmp(zKey, pTerm, nTerm)==0 ) break;
+  }
+
+  if( p ){
+    int nHashPre = sizeof(Fts5HashEntry) + nTerm;
+    int nList = p->nData - nHashPre;
+    u8 *pRet = (u8*)(*ppOut = sqlite3_malloc64(nPre + nList + 10));
+    if( pRet ){
+      Fts5HashEntry *pFaux = (Fts5HashEntry*)&pRet[nPre-nHashPre];
+      memcpy(&pRet[nPre], &((u8*)p)[nHashPre], nList);
+      nList += fts5HashAddPoslistSize(pHash, p, pFaux);
+      *pnDoclist = nList;
+    }else{
+      *pnDoclist = 0;
+      return SQLITE_NOMEM;
+    }
+  }else{
+    *ppOut = 0;
+    *pnDoclist = 0;
+  }
+
+  return SQLITE_OK;
+}
+
+static int sqlite3Fts5HashScanInit(
+  Fts5Hash *p,                    /* Hash table to query */
+  const char *pTerm, int nTerm    /* Query prefix */
+){
+  return fts5HashEntrySort(p, pTerm, nTerm, &p->pScan);
+}
+
+#ifdef SQLITE_DEBUG
+static int fts5HashCount(Fts5Hash *pHash){
+  int nEntry = 0;
+  int ii;
+  for(ii=0; ii<pHash->nSlot; ii++){
+    Fts5HashEntry *p = 0;
+    for(p=pHash->aSlot[ii]; p; p=p->pHashNext){
+      nEntry++;
+    }
+  }
+  return nEntry;
+}
+#endif
+
+/*
+** Return true if the hash table is empty, false otherwise.
+*/
+static int sqlite3Fts5HashIsEmpty(Fts5Hash *pHash){
+  assert( pHash->nEntry==fts5HashCount(pHash) );
+  return pHash->nEntry==0;
+}
+
+static void sqlite3Fts5HashScanNext(Fts5Hash *p){
+  assert( !sqlite3Fts5HashScanEof(p) );
+  p->pScan = p->pScan->pScanNext;
+}
+
+static int sqlite3Fts5HashScanEof(Fts5Hash *p){
+  return (p->pScan==0);
+}
+
+static void sqlite3Fts5HashScanEntry(
+  Fts5Hash *pHash,
+  const char **pzTerm,            /* OUT: term (nul-terminated) */
+  int *pnTerm,                    /* OUT: Size of term in bytes */
+  const u8 **ppDoclist,           /* OUT: pointer to doclist */
+  int *pnDoclist                  /* OUT: size of doclist in bytes */
+){
+  Fts5HashEntry *p;
+  if( (p = pHash->pScan) ){
+    char *zKey = fts5EntryKey(p);
+    int nTerm = p->nKey;
+    fts5HashAddPoslistSize(pHash, p, 0);
+    *pzTerm = zKey;
+    *pnTerm = nTerm;
+    *ppDoclist = (const u8*)&zKey[nTerm];
+    *pnDoclist = p->nData - (sizeof(Fts5HashEntry) + nTerm);
+  }else{
+    *pzTerm = 0;
+    *pnTerm = 0;
+    *ppDoclist = 0;
+    *pnDoclist = 0;
+  }
+}
+
+#line 1 "fts5_index.c"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Low level access to the FTS index stored in the database file. The 
+** routines in this file file implement all read and write access to the
+** %_data table. Other parts of the system access this functionality via
+** the interface defined in fts5Int.h.
+*/
+
+
+/* #include "fts5Int.h" */
+
+/*
+** Overview:
+**
+** The %_data table contains all the FTS indexes for an FTS5 virtual table.
+** As well as the main term index, there may be up to 31 prefix indexes.
+** The format is similar to FTS3/4, except that:
+**
+**   * all segment b-tree leaf data is stored in fixed size page records 
+**     (e.g. 1000 bytes). A single doclist may span multiple pages. Care is 
+**     taken to ensure it is possible to iterate in either direction through 
+**     the entries in a doclist, or to seek to a specific entry within a 
+**     doclist, without loading it into memory.
+**
+**   * large doclists that span many pages have associated "doclist index"
+**     records that contain a copy of the first rowid on each page spanned by
+**     the doclist. This is used to speed up seek operations, and merges of
+**     large doclists with very small doclists.
+**
+**   * extra fields in the "structure record" record the state of ongoing
+**     incremental merge operations.
+**
+*/
+
+
+#define FTS5_OPT_WORK_UNIT  1000  /* Number of leaf pages per optimize step */
+#define FTS5_WORK_UNIT      64    /* Number of leaf pages in unit of work */
+
+#define FTS5_MIN_DLIDX_SIZE 4     /* Add dlidx if this many empty pages */
+
+#define FTS5_MAIN_PREFIX '0'
+
+#if FTS5_MAX_PREFIX_INDEXES > 31
+# error "FTS5_MAX_PREFIX_INDEXES is too large"
+#endif
+
+#define FTS5_MAX_LEVEL 64
+
+/*
+** There are two versions of the format used for the structure record:
+**
+**   1. the legacy format, that may be read by all fts5 versions, and
+**
+**   2. the V2 format, which is used by contentless_delete=1 databases.
+**
+** Both begin with a 4-byte "configuration cookie" value. Then, a legacy
+** format structure record contains a varint - the number of levels in
+** the structure. Whereas a V2 structure record contains the constant
+** 4 bytes [0xff 0x00 0x00 0x01]. This is unambiguous as the value of a
+** varint has to be at least 16256 to begin with "0xFF". And the default
+** maximum number of levels is 64. 
+**
+** See below for more on structure record formats.
+*/
+#define FTS5_STRUCTURE_V2 "\xFF\x00\x00\x01"
+
+/*
+** Details:
+**
+** The %_data table managed by this module,
+**
+**     CREATE TABLE %_data(id INTEGER PRIMARY KEY, block BLOB);
+**
+** , contains the following 6 types of records. See the comments surrounding
+** the FTS5_*_ROWID macros below for a description of how %_data rowids are 
+** assigned to each fo them.
+**
+** 1. Structure Records:
+**
+**   The set of segments that make up an index - the index structure - are
+**   recorded in a single record within the %_data table. The record consists
+**   of a single 32-bit configuration cookie value followed by a list of
+**   SQLite varints. 
+**
+**   If the structure record is a V2 record, the configuration cookie is 
+**   followed by the following 4 bytes: [0xFF 0x00 0x00 0x01]. 
+**
+**   Next, the record continues with three varints:
+**
+**     + number of levels,
+**     + total number of segments on all levels,
+**     + value of write counter.
+**
+**   Then, for each level from 0 to nMax:
+**
+**     + number of input segments in ongoing merge.
+**     + total number of segments in level.
+**     + for each segment from oldest to newest:
+**         + segment id (always > 0)
+**         + first leaf page number (often 1, always greater than 0)
+**         + final leaf page number
+**
+**      Then, for V2 structures only:
+**
+**         + lower origin counter value,
+**         + upper origin counter value,
+**         + the number of tombstone hash pages.
+**
+** 2. The Averages Record:
+**
+**   A single record within the %_data table. The data is a list of varints.
+**   The first value is the number of rows in the index. Then, for each column
+**   from left to right, the total number of tokens in the column for all
+**   rows of the table.
+**
+** 3. Segment leaves:
+**
+**   TERM/DOCLIST FORMAT:
+**
+**     Most of each segment leaf is taken up by term/doclist data. The 
+**     general format of term/doclist, starting with the first term
+**     on the leaf page, is:
+**
+**         varint : size of first term
+**         blob:    first term data
+**         doclist: first doclist
+**         zero-or-more {
+**           varint:  number of bytes in common with previous term
+**           varint:  number of bytes of new term data (nNew)
+**           blob:    nNew bytes of new term data
+**           doclist: next doclist
+**         }
+**
+**     doclist format:
+**
+**         varint:  first rowid
+**         poslist: first poslist
+**         zero-or-more {
+**           varint:  rowid delta (always > 0)
+**           poslist: next poslist
+**         }
+**
+**     poslist format:
+**
+**         varint: size of poslist in bytes multiplied by 2, not including
+**                 this field. Plus 1 if this entry carries the "delete" flag.
+**         collist: collist for column 0
+**         zero-or-more {
+**           0x01 byte
+**           varint: column number (I)
+**           collist: collist for column I
+**         }
+**
+**     collist format:
+**
+**         varint: first offset + 2
+**         zero-or-more {
+**           varint: offset delta + 2
+**         }
+**
+**   PAGE FORMAT
+**
+**     Each leaf page begins with a 4-byte header containing 2 16-bit 
+**     unsigned integer fields in big-endian format. They are:
+**
+**       * The byte offset of the first rowid on the page, if it exists
+**         and occurs before the first term (otherwise 0).
+**
+**       * The byte offset of the start of the page footer. If the page
+**         footer is 0 bytes in size, then this field is the same as the
+**         size of the leaf page in bytes.
+**
+**     The page footer consists of a single varint for each term located
+**     on the page. Each varint is the byte offset of the current term
+**     within the page, delta-compressed against the previous value. In
+**     other words, the first varint in the footer is the byte offset of
+**     the first term, the second is the byte offset of the second less that
+**     of the first, and so on.
+**
+**     The term/doclist format described above is accurate if the entire
+**     term/doclist data fits on a single leaf page. If this is not the case,
+**     the format is changed in two ways:
+**
+**       + if the first rowid on a page occurs before the first term, it
+**         is stored as a literal value:
+**
+**             varint:  first rowid
+**
+**       + the first term on each page is stored in the same way as the
+**         very first term of the segment:
+**
+**             varint : size of first term
+**             blob:    first term data
+**
+** 5. Segment doclist indexes:
+**
+**   Doclist indexes are themselves b-trees, however they usually consist of
+**   a single leaf record only. The format of each doclist index leaf page 
+**   is:
+**
+**     * Flags byte. Bits are:
+**         0x01: Clear if leaf is also the root page, otherwise set.
+**
+**     * Page number of fts index leaf page. As a varint.
+**
+**     * First rowid on page indicated by previous field. As a varint.
+**
+**     * A list of varints, one for each subsequent termless page. A 
+**       positive delta if the termless page contains at least one rowid, 
+**       or an 0x00 byte otherwise.
+**
+**   Internal doclist index nodes are:
+**
+**     * Flags byte. Bits are:
+**         0x01: Clear for root page, otherwise set.
+**
+**     * Page number of first child page. As a varint.
+**
+**     * Copy of first rowid on page indicated by previous field. As a varint.
+**
+**     * A list of delta-encoded varints - the first rowid on each subsequent
+**       child page. 
+**
+** 6. Tombstone Hash Page
+**
+**   These records are only ever present in contentless_delete=1 tables. 
+**   There are zero or more of these associated with each segment. They
+**   are used to store the tombstone rowids for rows contained in the
+**   associated segments.
+**
+**   The set of nHashPg tombstone hash pages associated with a single 
+**   segment together form a single hash table containing tombstone rowids.
+**   To find the page of the hash on which a key might be stored:
+**
+**       iPg = (rowid % nHashPg)
+**
+**   Then, within page iPg, which has nSlot slots:
+**
+**       iSlot = (rowid / nHashPg) % nSlot
+**
+**   Each tombstone hash page begins with an 8 byte header: 
+**
+**     1-byte:  Key-size (the size in bytes of each slot). Either 4 or 8.
+**     1-byte:  rowid-0-tombstone flag. This flag is only valid on the 
+**              first tombstone hash page for each segment (iPg=0). If set,
+**              the hash table contains rowid 0. If clear, it does not.
+**              Rowid 0 is handled specially.
+**     2-bytes: unused.
+**     4-bytes: Big-endian integer containing number of entries on page.
+**
+**   Following this are nSlot 4 or 8 byte slots (depending on the key-size
+**   in the first byte of the page header). The number of slots may be
+**   determined based on the size of the page record and the key-size:
+**
+**     nSlot = (nByte - 8) / key-size
+*/
+
+/*
+** Rowids for the averages and structure records in the %_data table.
+*/
+#define FTS5_AVERAGES_ROWID     1    /* Rowid used for the averages record */
+#define FTS5_STRUCTURE_ROWID   10    /* The structure record */
+
+/*
+** Macros determining the rowids used by segment leaves and dlidx leaves
+** and nodes. All nodes and leaves are stored in the %_data table with large
+** positive rowids.
+**
+** Each segment has a unique non-zero 16-bit id.
+**
+** The rowid for each segment leaf is found by passing the segment id and 
+** the leaf page number to the FTS5_SEGMENT_ROWID macro. Leaves are numbered
+** sequentially starting from 1.
+*/
+#define FTS5_DATA_ID_B     16     /* Max seg id number 65535 */
+#define FTS5_DATA_DLI_B     1     /* Doclist-index flag (1 bit) */
+#define FTS5_DATA_HEIGHT_B  5     /* Max dlidx tree height of 32 */
+#define FTS5_DATA_PAGE_B   31     /* Max page number of 2147483648 */
+
+#define fts5_dri(segid, dlidx, height, pgno) (                                 \
+ ((i64)(segid)  << (FTS5_DATA_PAGE_B+FTS5_DATA_HEIGHT_B+FTS5_DATA_DLI_B)) +    \
+ ((i64)(dlidx)  << (FTS5_DATA_PAGE_B + FTS5_DATA_HEIGHT_B)) +                  \
+ ((i64)(height) << (FTS5_DATA_PAGE_B)) +                                       \
+ ((i64)(pgno))                                                                 \
+)
+
+#define FTS5_SEGMENT_ROWID(segid, pgno)       fts5_dri(segid, 0, 0, pgno)
+#define FTS5_DLIDX_ROWID(segid, height, pgno) fts5_dri(segid, 1, height, pgno)
+#define FTS5_TOMBSTONE_ROWID(segid,ipg)       fts5_dri(segid+(1<<16), 0, 0, ipg)
+
+#ifdef SQLITE_DEBUG
+static int sqlite3Fts5Corrupt() { return SQLITE_CORRUPT_VTAB; }
+#endif
+
+
+/*
+** Each time a blob is read from the %_data table, it is padded with this
+** many zero bytes. This makes it easier to decode the various record formats
+** without overreading if the records are corrupt.
+*/
+#define FTS5_DATA_ZERO_PADDING 8
+#define FTS5_DATA_PADDING 20
+
+typedef struct Fts5Data Fts5Data;
+typedef struct Fts5DlidxIter Fts5DlidxIter;
+typedef struct Fts5DlidxLvl Fts5DlidxLvl;
+typedef struct Fts5DlidxWriter Fts5DlidxWriter;
+typedef struct Fts5Iter Fts5Iter;
+typedef struct Fts5PageWriter Fts5PageWriter;
+typedef struct Fts5SegIter Fts5SegIter;
+typedef struct Fts5DoclistIter Fts5DoclistIter;
+typedef struct Fts5SegWriter Fts5SegWriter;
+typedef struct Fts5Structure Fts5Structure;
+typedef struct Fts5StructureLevel Fts5StructureLevel;
+typedef struct Fts5StructureSegment Fts5StructureSegment;
+typedef struct Fts5TokenDataIter Fts5TokenDataIter;
+typedef struct Fts5TokenDataMap Fts5TokenDataMap;
+typedef struct Fts5TombstoneArray Fts5TombstoneArray;
+
+struct Fts5Data {
+  u8 *p;                          /* Pointer to buffer containing record */
+  int nn;                         /* Size of record in bytes */
+  int szLeaf;                     /* Size of leaf without page-index */
+};
+
+/*
+** One object per %_data table.
+**
+** nContentlessDelete:
+**   The number of contentless delete operations since the most recent
+**   call to fts5IndexFlush() or fts5IndexDiscardData(). This is tracked
+**   so that extra auto-merge work can be done by fts5IndexFlush() to
+**   account for the delete operations.
+*/
+struct Fts5Index {
+  Fts5Config *pConfig;            /* Virtual table configuration */
+  char *zDataTbl;                 /* Name of %_data table */
+  int nWorkUnit;                  /* Leaf pages in a "unit" of work */
+
+  /*
+  ** Variables related to the accumulation of tokens and doclists within the
+  ** in-memory hash tables before they are flushed to disk.
+  */
+  Fts5Hash *pHash;                /* Hash table for in-memory data */
+  int nPendingData;               /* Current bytes of pending data */
+  i64 iWriteRowid;                /* Rowid for current doc being written */
+  int bDelete;                    /* Current write is a delete */
+  int nContentlessDelete;         /* Number of contentless delete ops */
+  int nPendingRow;                /* Number of INSERT in hash table */
+
+  /* Error state. */
+  int rc;                         /* Current error code */
+  int flushRc;
+
+  /* State used by the fts5DataXXX() functions. */
+  sqlite3_blob *pReader;          /* RO incr-blob open on %_data table */
+  sqlite3_stmt *pWriter;          /* "INSERT ... %_data VALUES(?,?)" */
+  sqlite3_stmt *pDeleter;         /* "DELETE FROM %_data ... id>=? AND id<=?" */
+  sqlite3_stmt *pIdxWriter;       /* "INSERT ... %_idx VALUES(?,?,?,?)" */
+  sqlite3_stmt *pIdxDeleter;      /* "DELETE FROM %_idx WHERE segid=?" */
+  sqlite3_stmt *pIdxSelect;
+  sqlite3_stmt *pIdxNextSelect;
+  int nRead;                      /* Total number of blocks read */
+
+  sqlite3_stmt *pDeleteFromIdx;
+
+  sqlite3_stmt *pDataVersion;
+  i64 iStructVersion;             /* data_version when pStruct read */
+  Fts5Structure *pStruct;         /* Current db structure (or NULL) */
+};
+
+struct Fts5DoclistIter {
+  u8 *aEof;                       /* Pointer to 1 byte past end of doclist */
+
+  /* Output variables. aPoslist==0 at EOF */
+  i64 iRowid;
+  u8 *aPoslist;
+  int nPoslist;
+  int nSize;
+};
+
+/*
+** The contents of the "structure" record for each index are represented
+** using an Fts5Structure record in memory. Which uses instances of the 
+** other Fts5StructureXXX types as components.
+**
+** nOriginCntr:
+**   This value is set to non-zero for structure records created for
+**   contentlessdelete=1 tables only. In that case it represents the
+**   origin value to apply to the next top-level segment created.
+*/
+struct Fts5StructureSegment {
+  int iSegid;                     /* Segment id */
+  int pgnoFirst;                  /* First leaf page number in segment */
+  int pgnoLast;                   /* Last leaf page number in segment */
+
+  /* contentlessdelete=1 tables only: */
+  u64 iOrigin1;
+  u64 iOrigin2;
+  int nPgTombstone;               /* Number of tombstone hash table pages */
+  u64 nEntryTombstone;            /* Number of tombstone entries that "count" */
+  u64 nEntry;                     /* Number of rows in this segment */
+};
+struct Fts5StructureLevel {
+  int nMerge;                     /* Number of segments in incr-merge */
+  int nSeg;                       /* Total number of segments on level */
+  Fts5StructureSegment *aSeg;     /* Array of segments. aSeg[0] is oldest. */
+};
+struct Fts5Structure {
+  int nRef;                       /* Object reference count */
+  u64 nWriteCounter;              /* Total leaves written to level 0 */
+  u64 nOriginCntr;                /* Origin value for next top-level segment */
+  int nSegment;                   /* Total segments in this structure */
+  int nLevel;                     /* Number of levels in this index */
+  Fts5StructureLevel aLevel[1];   /* Array of nLevel level objects */
+};
+
+/*
+** An object of type Fts5SegWriter is used to write to segments.
+*/
+struct Fts5PageWriter {
+  int pgno;                       /* Page number for this page */
+  int iPrevPgidx;                 /* Previous value written into pgidx */
+  Fts5Buffer buf;                 /* Buffer containing leaf data */
+  Fts5Buffer pgidx;               /* Buffer containing page-index */
+  Fts5Buffer term;                /* Buffer containing previous term on page */
+};
+struct Fts5DlidxWriter {
+  int pgno;                       /* Page number for this page */
+  int bPrevValid;                 /* True if iPrev is valid */
+  i64 iPrev;                      /* Previous rowid value written to page */
+  Fts5Buffer buf;                 /* Buffer containing page data */
+};
+struct Fts5SegWriter {
+  int iSegid;                     /* Segid to write to */
+  Fts5PageWriter writer;          /* PageWriter object */
+  i64 iPrevRowid;                 /* Previous rowid written to current leaf */
+  u8 bFirstRowidInDoclist;        /* True if next rowid is first in doclist */
+  u8 bFirstRowidInPage;           /* True if next rowid is first in page */
+  /* TODO1: Can use (writer.pgidx.n==0) instead of bFirstTermInPage */
+  u8 bFirstTermInPage;            /* True if next term will be first in leaf */
+  int nLeafWritten;               /* Number of leaf pages written */
+  int nEmpty;                     /* Number of contiguous term-less nodes */
+
+  int nDlidx;                     /* Allocated size of aDlidx[] array */
+  Fts5DlidxWriter *aDlidx;        /* Array of Fts5DlidxWriter objects */
+
+  /* Values to insert into the %_idx table */
+  Fts5Buffer btterm;              /* Next term to insert into %_idx table */
+  int iBtPage;                    /* Page number corresponding to btterm */
+};
+
+typedef struct Fts5CResult Fts5CResult;
+struct Fts5CResult {
+  u16 iFirst;                     /* aSeg[] index of firstest iterator */
+  u8 bTermEq;                     /* True if the terms are equal */
+};
+
+/*
+** Object for iterating through a single segment, visiting each term/rowid
+** pair in the segment.
+**
+** pSeg:
+**   The segment to iterate through.
+**
+** iLeafPgno:
+**   Current leaf page number within segment.
+**
+** iLeafOffset:
+**   Byte offset within the current leaf that is the first byte of the 
+**   position list data (one byte passed the position-list size field).
+**
+** pLeaf:
+**   Buffer containing current leaf page data. Set to NULL at EOF.
+**
+** iTermLeafPgno, iTermLeafOffset:
+**   Leaf page number containing the last term read from the segment. And
+**   the offset immediately following the term data.
+**
+** flags:
+**   Mask of FTS5_SEGITER_XXX values. Interpreted as follows:
+**
+**   FTS5_SEGITER_ONETERM:
+**     If set, set the iterator to point to EOF after the current doclist 
+**     has been exhausted. Do not proceed to the next term in the segment.
+**
+**   FTS5_SEGITER_REVERSE:
+**     This flag is only ever set if FTS5_SEGITER_ONETERM is also set. If
+**     it is set, iterate through rowid in descending order instead of the
+**     default ascending order.
+**
+** iRowidOffset/nRowidOffset/aRowidOffset:
+**     These are used if the FTS5_SEGITER_REVERSE flag is set.
+**
+**     For each rowid on the page corresponding to the current term, the
+**     corresponding aRowidOffset[] entry is set to the byte offset of the
+**     start of the "position-list-size" field within the page.
+**
+** iTermIdx:
+**     Index of current term on iTermLeafPgno.
+**
+** apTombstone/nTombstone:
+**     These are used for contentless_delete=1 tables only. When the cursor
+**     is first allocated, the apTombstone[] array is allocated so that it
+**     is large enough for all tombstones hash pages associated with the
+**     segment. The pages themselves are loaded lazily from the database as
+**     they are required.
+*/
+struct Fts5SegIter {
+  Fts5StructureSegment *pSeg;     /* Segment to iterate through */
+  int flags;                      /* Mask of configuration flags */
+  int iLeafPgno;                  /* Current leaf page number */
+  Fts5Data *pLeaf;                /* Current leaf data */
+  Fts5Data *pNextLeaf;            /* Leaf page (iLeafPgno+1) */
+  i64 iLeafOffset;                /* Byte offset within current leaf */
+  Fts5TombstoneArray *pTombArray; /* Array of tombstone pages */
+
+  /* Next method */
+  void (*xNext)(Fts5Index*, Fts5SegIter*, int*);
+
+  /* The page and offset from which the current term was read. The offset 
+  ** is the offset of the first rowid in the current doclist.  */
+  int iTermLeafPgno;
+  int iTermLeafOffset;
+
+  int iPgidxOff;                  /* Next offset in pgidx */
+  int iEndofDoclist;
+
+  /* The following are only used if the FTS5_SEGITER_REVERSE flag is set. */
+  int iRowidOffset;               /* Current entry in aRowidOffset[] */
+  int nRowidOffset;               /* Allocated size of aRowidOffset[] array */
+  int *aRowidOffset;              /* Array of offset to rowid fields */
+
+  Fts5DlidxIter *pDlidx;          /* If there is a doclist-index */
+
+  /* Variables populated based on current entry. */
+  Fts5Buffer term;                /* Current term */
+  i64 iRowid;                     /* Current rowid */
+  int nPos;                       /* Number of bytes in current position list */
+  u8 bDel;                        /* True if the delete flag is set */
+};
+
+/*
+** Array of tombstone pages. Reference counted.
+*/
+struct Fts5TombstoneArray {
+  int nRef;                       /* Number of pointers to this object */
+  int nTombstone;
+  Fts5Data *apTombstone[1];       /* Array of tombstone pages */
+};
+
+/*
+** Argument is a pointer to an Fts5Data structure that contains a 
+** leaf page.
+*/
+#define ASSERT_SZLEAF_OK(x) assert( \
+    (x)->szLeaf==(x)->nn || (x)->szLeaf==fts5GetU16(&(x)->p[2]) \
+)
+
+#define FTS5_SEGITER_ONETERM 0x01
+#define FTS5_SEGITER_REVERSE 0x02
+
+/* 
+** Argument is a pointer to an Fts5Data structure that contains a leaf
+** page. This macro evaluates to true if the leaf contains no terms, or
+** false if it contains at least one term.
+*/
+#define fts5LeafIsTermless(x) ((x)->szLeaf >= (x)->nn)
+
+#define fts5LeafTermOff(x, i) (fts5GetU16(&(x)->p[(x)->szLeaf + (i)*2]))
+
+#define fts5LeafFirstRowidOff(x) (fts5GetU16((x)->p))
+
+/*
+** Object for iterating through the merged results of one or more segments,
+** visiting each term/rowid pair in the merged data.
+**
+** nSeg is always a power of two greater than or equal to the number of
+** segments that this object is merging data from. Both the aSeg[] and
+** aFirst[] arrays are sized at nSeg entries. The aSeg[] array is padded
+** with zeroed objects - these are handled as if they were iterators opened
+** on empty segments.
+**
+** The results of comparing segments aSeg[N] and aSeg[N+1], where N is an
+** even number, is stored in aFirst[(nSeg+N)/2]. The "result" of the 
+** comparison in this context is the index of the iterator that currently
+** points to the smaller term/rowid combination. Iterators at EOF are
+** considered to be greater than all other iterators.
+**
+** aFirst[1] contains the index in aSeg[] of the iterator that points to
+** the smallest key overall. aFirst[0] is unused. 
+**
+** poslist:
+**   Used by sqlite3Fts5IterPoslist() when the poslist needs to be buffered.
+**   There is no way to tell if this is populated or not.
+**
+** pColset:
+**   If not NULL, points to an object containing a set of column indices.
+**   Only matches that occur in one of these columns will be returned.
+**   The Fts5Iter does not own the Fts5Colset object, and so it is not
+**   freed when the iterator is closed - it is owned by the upper layer.
+*/
+struct Fts5Iter {
+  Fts5IndexIter base;             /* Base class containing output vars */
+  Fts5TokenDataIter *pTokenDataIter;
+
+  Fts5Index *pIndex;              /* Index that owns this iterator */
+  Fts5Buffer poslist;             /* Buffer containing current poslist */
+  Fts5Colset *pColset;            /* Restrict matches to these columns */
+
+  /* Invoked to set output variables. */
+  void (*xSetOutputs)(Fts5Iter*, Fts5SegIter*);
+
+  int nSeg;                       /* Size of aSeg[] array */
+  int bRev;                       /* True to iterate in reverse order */
+  u8 bSkipEmpty;                  /* True to skip deleted entries */
+
+  i64 iSwitchRowid;               /* Firstest rowid of other than aFirst[1] */
+  Fts5CResult *aFirst;            /* Current merge state (see above) */
+  Fts5SegIter aSeg[1];            /* Array of segment iterators */
+};
+
+/*
+** An instance of the following type is used to iterate through the contents
+** of a doclist-index record.
+**
+** pData:
+**   Record containing the doclist-index data.
+**
+** bEof:
+**   Set to true once iterator has reached EOF.
+**
+** iOff:
+**   Set to the current offset within record pData.
+*/
+struct Fts5DlidxLvl {
+  Fts5Data *pData;              /* Data for current page of this level */
+  int iOff;                     /* Current offset into pData */
+  int bEof;                     /* At EOF already */
+  int iFirstOff;                /* Used by reverse iterators */
+
+  /* Output variables */
+  int iLeafPgno;                /* Page number of current leaf page */
+  i64 iRowid;                   /* First rowid on leaf iLeafPgno */
+};
+struct Fts5DlidxIter {
+  int nLvl;
+  int iSegid;
+  Fts5DlidxLvl aLvl[1];
+};
+
+static void fts5PutU16(u8 *aOut, u16 iVal){
+  aOut[0] = (iVal>>8);
+  aOut[1] = (iVal&0xFF);
+}
+
+static u16 fts5GetU16(const u8 *aIn){
+  return ((u16)aIn[0] << 8) + aIn[1];
+} 
+
+/*
+** The only argument points to a buffer at least 8 bytes in size. This
+** function interprets the first 8 bytes of the buffer as a 64-bit big-endian
+** unsigned integer and returns the result.
+*/
+static u64 fts5GetU64(u8 *a){
+  return ((u64)a[0] << 56)
+       + ((u64)a[1] << 48)
+       + ((u64)a[2] << 40)
+       + ((u64)a[3] << 32)
+       + ((u64)a[4] << 24)
+       + ((u64)a[5] << 16)
+       + ((u64)a[6] << 8)
+       + ((u64)a[7] << 0);
+}
+
+/*
+** The only argument points to a buffer at least 4 bytes in size. This
+** function interprets the first 4 bytes of the buffer as a 32-bit big-endian
+** unsigned integer and returns the result.
+*/
+static u32 fts5GetU32(const u8 *a){
+  return ((u32)a[0] << 24)
+       + ((u32)a[1] << 16)
+       + ((u32)a[2] << 8)
+       + ((u32)a[3] << 0);
+} 
+
+/*
+** Write iVal, formated as a 64-bit big-endian unsigned integer, to the
+** buffer indicated by the first argument.
+*/
+static void fts5PutU64(u8 *a, u64 iVal){
+  a[0] = ((iVal >> 56) & 0xFF);
+  a[1] = ((iVal >> 48) & 0xFF);
+  a[2] = ((iVal >> 40) & 0xFF);
+  a[3] = ((iVal >> 32) & 0xFF);
+  a[4] = ((iVal >> 24) & 0xFF);
+  a[5] = ((iVal >> 16) & 0xFF);
+  a[6] = ((iVal >>  8) & 0xFF);
+  a[7] = ((iVal >>  0) & 0xFF);
+}
+
+/*
+** Write iVal, formated as a 32-bit big-endian unsigned integer, to the
+** buffer indicated by the first argument.
+*/
+static void fts5PutU32(u8 *a, u32 iVal){
+  a[0] = ((iVal >> 24) & 0xFF);
+  a[1] = ((iVal >> 16) & 0xFF);
+  a[2] = ((iVal >>  8) & 0xFF);
+  a[3] = ((iVal >>  0) & 0xFF);
+}
+
+/*
+** Allocate and return a buffer at least nByte bytes in size.
+**
+** If an OOM error is encountered, return NULL and set the error code in
+** the Fts5Index handle passed as the first argument.
+*/
+static void *fts5IdxMalloc(Fts5Index *p, sqlite3_int64 nByte){
+  return sqlite3Fts5MallocZero(&p->rc, nByte);
+}
+
+/*
+** Compare the contents of the pLeft buffer with the pRight/nRight blob.
+**
+** Return -ve if pLeft is smaller than pRight, 0 if they are equal or
+** +ve if pRight is smaller than pLeft. In other words:
+**
+**     res = *pLeft - *pRight
+*/
+#ifdef SQLITE_DEBUG
+static int fts5BufferCompareBlob(
+  Fts5Buffer *pLeft,              /* Left hand side of comparison */
+  const u8 *pRight, int nRight    /* Right hand side of comparison */
+){
+  int nCmp = MIN(pLeft->n, nRight);
+  int res = memcmp(pLeft->p, pRight, nCmp);
+  return (res==0 ? (pLeft->n - nRight) : res);
+}
+#endif
+
+/*
+** Compare the contents of the two buffers using memcmp(). If one buffer
+** is a prefix of the other, it is considered the lesser.
+**
+** Return -ve if pLeft is smaller than pRight, 0 if they are equal or
+** +ve if pRight is smaller than pLeft. In other words:
+**
+**     res = *pLeft - *pRight
+*/
+static int fts5BufferCompare(Fts5Buffer *pLeft, Fts5Buffer *pRight){
+  int nCmp, res;
+  nCmp = MIN(pLeft->n, pRight->n);
+  assert( nCmp<=0 || pLeft->p!=0 );
+  assert( nCmp<=0 || pRight->p!=0 );
+  res = fts5Memcmp(pLeft->p, pRight->p, nCmp);
+  return (res==0 ? (pLeft->n - pRight->n) : res);
+}
+
+static int fts5LeafFirstTermOff(Fts5Data *pLeaf){
+  int ret;
+  fts5GetVarint32(&pLeaf->p[pLeaf->szLeaf], ret);
+  return ret;
+}
+
+/*
+** Close the read-only blob handle, if it is open.
+*/
+static void sqlite3Fts5IndexCloseReader(Fts5Index *p){
+  if( p->pReader ){
+    sqlite3_blob *pReader = p->pReader;
+    p->pReader = 0;
+    sqlite3_blob_close(pReader);
+  }
+}
+
+/*
+** Retrieve a record from the %_data table.
+**
+** If an error occurs, NULL is returned and an error left in the 
+** Fts5Index object.
+*/
+static Fts5Data *fts5DataRead(Fts5Index *p, i64 iRowid){
+  Fts5Data *pRet = 0;
+  if( p->rc==SQLITE_OK ){
+    int rc = SQLITE_OK;
+
+    if( p->pReader ){
+      /* This call may return SQLITE_ABORT if there has been a savepoint
+      ** rollback since it was last used. In this case a new blob handle
+      ** is required.  */
+      sqlite3_blob *pBlob = p->pReader;
+      p->pReader = 0;
+      rc = sqlite3_blob_reopen(pBlob, iRowid);
+      assert( p->pReader==0 );
+      p->pReader = pBlob;
+      if( rc!=SQLITE_OK ){
+        sqlite3Fts5IndexCloseReader(p);
+      }
+      if( rc==SQLITE_ABORT ) rc = SQLITE_OK;
+    }
+
+    /* If the blob handle is not open at this point, open it and seek 
+    ** to the requested entry.  */
+    if( p->pReader==0 && rc==SQLITE_OK ){
+      Fts5Config *pConfig = p->pConfig;
+      rc = sqlite3_blob_open(pConfig->db, 
+          pConfig->zDb, p->zDataTbl, "block", iRowid, 0, &p->pReader
+      );
+    }
+
+    /* If either of the sqlite3_blob_open() or sqlite3_blob_reopen() calls
+    ** above returned SQLITE_ERROR, return SQLITE_CORRUPT_VTAB instead.
+    ** All the reasons those functions might return SQLITE_ERROR - missing
+    ** table, missing row, non-blob/text in block column - indicate 
+    ** backing store corruption.  */
+    if( rc==SQLITE_ERROR ) rc = FTS5_CORRUPT;
+
+    if( rc==SQLITE_OK ){
+      u8 *aOut = 0;               /* Read blob data into this buffer */
+      int nByte = sqlite3_blob_bytes(p->pReader);
+      sqlite3_int64 nAlloc = sizeof(Fts5Data) + nByte + FTS5_DATA_PADDING;
+      pRet = (Fts5Data*)sqlite3_malloc64(nAlloc);
+      if( pRet ){
+        pRet->nn = nByte;
+        aOut = pRet->p = (u8*)&pRet[1];
+      }else{
+        rc = SQLITE_NOMEM;
+      }
+
+      if( rc==SQLITE_OK ){
+        rc = sqlite3_blob_read(p->pReader, aOut, nByte, 0);
+      }
+      if( rc!=SQLITE_OK ){
+        sqlite3_free(pRet);
+        pRet = 0;
+      }else{
+        /* TODO1: Fix this */
+        pRet->p[nByte] = 0x00;
+        pRet->p[nByte+1] = 0x00;
+        pRet->szLeaf = fts5GetU16(&pRet->p[2]);
+      }
+    }
+    p->rc = rc;
+    p->nRead++;
+  }
+
+  assert( (pRet==0)==(p->rc!=SQLITE_OK) );
+  return pRet;
+}
+
+
+/*
+** Release a reference to data record returned by an earlier call to
+** fts5DataRead().
+*/
+static void fts5DataRelease(Fts5Data *pData){
+  sqlite3_free(pData);
+}
+
+static Fts5Data *fts5LeafRead(Fts5Index *p, i64 iRowid){
+  Fts5Data *pRet = fts5DataRead(p, iRowid);
+  if( pRet ){
+    if( pRet->nn<4 || pRet->szLeaf>pRet->nn ){
+      p->rc = FTS5_CORRUPT;
+      fts5DataRelease(pRet);
+      pRet = 0;
+    }
+  }
+  return pRet;
+}
+
+static int fts5IndexPrepareStmt(
+  Fts5Index *p,
+  sqlite3_stmt **ppStmt,
+  char *zSql
+){
+  if( p->rc==SQLITE_OK ){
+    if( zSql ){
+      p->rc = sqlite3_prepare_v3(p->pConfig->db, zSql, -1,
+          SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_NO_VTAB,
+          ppStmt, 0);
+    }else{
+      p->rc = SQLITE_NOMEM;
+    }
+  }
+  sqlite3_free(zSql);
+  return p->rc;
+}
+
+
+/*
+** INSERT OR REPLACE a record into the %_data table.
+*/
+static void fts5DataWrite(Fts5Index *p, i64 iRowid, const u8 *pData, int nData){
+  if( p->rc!=SQLITE_OK ) return;
+
+  if( p->pWriter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pWriter, sqlite3_mprintf(
+          "REPLACE INTO '%q'.'%q_data'(id, block) VALUES(?,?)", 
+          pConfig->zDb, pConfig->zName
+    ));
+    if( p->rc ) return;
+  }
+
+  sqlite3_bind_int64(p->pWriter, 1, iRowid);
+  sqlite3_bind_blob(p->pWriter, 2, pData, nData, SQLITE_STATIC);
+  sqlite3_step(p->pWriter);
+  p->rc = sqlite3_reset(p->pWriter);
+  sqlite3_bind_null(p->pWriter, 2);
+}
+
+/*
+** Execute the following SQL:
+**
+**     DELETE FROM %_data WHERE id BETWEEN $iFirst AND $iLast
+*/
+static void fts5DataDelete(Fts5Index *p, i64 iFirst, i64 iLast){
+  if( p->rc!=SQLITE_OK ) return;
+
+  if( p->pDeleter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    char *zSql = sqlite3_mprintf(
+        "DELETE FROM '%q'.'%q_data' WHERE id>=? AND id<=?", 
+          pConfig->zDb, pConfig->zName
+    );
+    if( fts5IndexPrepareStmt(p, &p->pDeleter, zSql) ) return;
+  }
+
+  sqlite3_bind_int64(p->pDeleter, 1, iFirst);
+  sqlite3_bind_int64(p->pDeleter, 2, iLast);
+  sqlite3_step(p->pDeleter);
+  p->rc = sqlite3_reset(p->pDeleter);
+}
+
+/*
+** Remove all records associated with segment iSegid.
+*/
+static void fts5DataRemoveSegment(Fts5Index *p, Fts5StructureSegment *pSeg){
+  int iSegid = pSeg->iSegid;
+  i64 iFirst = FTS5_SEGMENT_ROWID(iSegid, 0);
+  i64 iLast = FTS5_SEGMENT_ROWID(iSegid+1, 0)-1;
+  fts5DataDelete(p, iFirst, iLast);
+
+  if( pSeg->nPgTombstone ){
+    i64 iTomb1 = FTS5_TOMBSTONE_ROWID(iSegid, 0);
+    i64 iTomb2 = FTS5_TOMBSTONE_ROWID(iSegid, pSeg->nPgTombstone-1);
+    fts5DataDelete(p, iTomb1, iTomb2);
+  }
+  if( p->pIdxDeleter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pIdxDeleter, sqlite3_mprintf(
+          "DELETE FROM '%q'.'%q_idx' WHERE segid=?",
+          pConfig->zDb, pConfig->zName
+    ));
+  }
+  if( p->rc==SQLITE_OK ){
+    sqlite3_bind_int(p->pIdxDeleter, 1, iSegid);
+    sqlite3_step(p->pIdxDeleter);
+    p->rc = sqlite3_reset(p->pIdxDeleter);
+  }
+}
+
+/*
+** Release a reference to an Fts5Structure object returned by an earlier 
+** call to fts5StructureRead() or fts5StructureDecode().
+*/
+static void fts5StructureRelease(Fts5Structure *pStruct){
+  if( pStruct && 0>=(--pStruct->nRef) ){
+    int i;
+    assert( pStruct->nRef==0 );
+    for(i=0; i<pStruct->nLevel; i++){
+      sqlite3_free(pStruct->aLevel[i].aSeg);
+    }
+    sqlite3_free(pStruct);
+  }
+}
+
+static void fts5StructureRef(Fts5Structure *pStruct){
+  pStruct->nRef++;
+}
+
+static void *sqlite3Fts5StructureRef(Fts5Index *p){
+  fts5StructureRef(p->pStruct);
+  return (void*)p->pStruct;
+}
+static void sqlite3Fts5StructureRelease(void *p){
+  if( p ){
+    fts5StructureRelease((Fts5Structure*)p);
+  }
+}
+static int sqlite3Fts5StructureTest(Fts5Index *p, void *pStruct){
+  if( p->pStruct!=(Fts5Structure*)pStruct ){
+    return SQLITE_ABORT;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Ensure that structure object (*pp) is writable.
+**
+** This function is a no-op if (*pRc) is not SQLITE_OK when it is called. If
+** an error occurs, (*pRc) is set to an SQLite error code before returning.
+*/
+static void fts5StructureMakeWritable(int *pRc, Fts5Structure **pp){
+  Fts5Structure *p = *pp;
+  if( *pRc==SQLITE_OK && p->nRef>1 ){
+    i64 nByte = sizeof(Fts5Structure)+(p->nLevel-1)*sizeof(Fts5StructureLevel);
+    Fts5Structure *pNew;
+    pNew = (Fts5Structure*)sqlite3Fts5MallocZero(pRc, nByte);
+    if( pNew ){
+      int i;
+      memcpy(pNew, p, nByte);
+      for(i=0; i<p->nLevel; i++) pNew->aLevel[i].aSeg = 0;
+      for(i=0; i<p->nLevel; i++){
+        Fts5StructureLevel *pLvl = &pNew->aLevel[i];
+        nByte = sizeof(Fts5StructureSegment) * pNew->aLevel[i].nSeg;
+        pLvl->aSeg = (Fts5StructureSegment*)sqlite3Fts5MallocZero(pRc, nByte);
+        if( pLvl->aSeg==0 ){
+          for(i=0; i<p->nLevel; i++){
+            sqlite3_free(pNew->aLevel[i].aSeg);
+          }
+          sqlite3_free(pNew);
+          return;
+        }
+        memcpy(pLvl->aSeg, p->aLevel[i].aSeg, nByte);
+      }
+      p->nRef--;
+      pNew->nRef = 1;
+    }
+    *pp = pNew;
+  }
+}
+
+/*
+** Deserialize and return the structure record currently stored in serialized
+** form within buffer pData/nData.
+**
+** The Fts5Structure.aLevel[] and each Fts5StructureLevel.aSeg[] array
+** are over-allocated by one slot. This allows the structure contents
+** to be more easily edited.
+**
+** If an error occurs, *ppOut is set to NULL and an SQLite error code
+** returned. Otherwise, *ppOut is set to point to the new object and
+** SQLITE_OK returned.
+*/
+static int fts5StructureDecode(
+  const u8 *pData,                /* Buffer containing serialized structure */
+  int nData,                      /* Size of buffer pData in bytes */
+  int *piCookie,                  /* Configuration cookie value */
+  Fts5Structure **ppOut           /* OUT: Deserialized object */
+){
+  int rc = SQLITE_OK;
+  int i = 0;
+  int iLvl;
+  int nLevel = 0;
+  int nSegment = 0;
+  sqlite3_int64 nByte;            /* Bytes of space to allocate at pRet */
+  Fts5Structure *pRet = 0;        /* Structure object to return */
+  int bStructureV2 = 0;           /* True for FTS5_STRUCTURE_V2 */
+  u64 nOriginCntr = 0;            /* Largest origin value seen so far */
+
+  /* Grab the cookie value */
+  if( piCookie ) *piCookie = sqlite3Fts5Get32(pData);
+  i = 4;
+
+  /* Check if this is a V2 structure record. Set bStructureV2 if it is. */
+  if( 0==memcmp(&pData[i], FTS5_STRUCTURE_V2, 4) ){
+    i += 4;
+    bStructureV2 = 1;
+  }
+
+  /* Read the total number of levels and segments from the start of the
+  ** structure record.  */
+  i += fts5GetVarint32(&pData[i], nLevel);
+  i += fts5GetVarint32(&pData[i], nSegment);
+  if( nLevel>FTS5_MAX_SEGMENT   || nLevel<0
+   || nSegment>FTS5_MAX_SEGMENT || nSegment<0
+  ){
+    return FTS5_CORRUPT;
+  }
+  nByte = (
+      sizeof(Fts5Structure) +                    /* Main structure */
+      sizeof(Fts5StructureLevel) * (nLevel-1)    /* aLevel[] array */
+  );
+  pRet = (Fts5Structure*)sqlite3Fts5MallocZero(&rc, nByte);
+
+  if( pRet ){
+    pRet->nRef = 1;
+    pRet->nLevel = nLevel;
+    pRet->nSegment = nSegment;
+    i += sqlite3Fts5GetVarint(&pData[i], &pRet->nWriteCounter);
+
+    for(iLvl=0; rc==SQLITE_OK && iLvl<nLevel; iLvl++){
+      Fts5StructureLevel *pLvl = &pRet->aLevel[iLvl];
+      int nTotal = 0;
+      int iSeg;
+
+      if( i>=nData ){
+        rc = FTS5_CORRUPT;
+      }else{
+        i += fts5GetVarint32(&pData[i], pLvl->nMerge);
+        i += fts5GetVarint32(&pData[i], nTotal);
+        if( nTotal<pLvl->nMerge ) rc = FTS5_CORRUPT;
+        pLvl->aSeg = (Fts5StructureSegment*)sqlite3Fts5MallocZero(&rc, 
+            nTotal * sizeof(Fts5StructureSegment)
+        );
+        nSegment -= nTotal;
+      }
+
+      if( rc==SQLITE_OK ){
+        pLvl->nSeg = nTotal;
+        for(iSeg=0; iSeg<nTotal; iSeg++){
+          Fts5StructureSegment *pSeg = &pLvl->aSeg[iSeg];
+          if( i>=nData ){
+            rc = FTS5_CORRUPT;
+            break;
+          }
+          assert( pSeg!=0 );
+          i += fts5GetVarint32(&pData[i], pSeg->iSegid);
+          i += fts5GetVarint32(&pData[i], pSeg->pgnoFirst);
+          i += fts5GetVarint32(&pData[i], pSeg->pgnoLast);
+          if( bStructureV2 ){
+            i += fts5GetVarint(&pData[i], &pSeg->iOrigin1);
+            i += fts5GetVarint(&pData[i], &pSeg->iOrigin2);
+            i += fts5GetVarint32(&pData[i], pSeg->nPgTombstone);
+            i += fts5GetVarint(&pData[i], &pSeg->nEntryTombstone);
+            i += fts5GetVarint(&pData[i], &pSeg->nEntry);
+            nOriginCntr = MAX(nOriginCntr, pSeg->iOrigin2);
+          }
+          if( pSeg->pgnoLast<pSeg->pgnoFirst ){
+            rc = FTS5_CORRUPT;
+            break;
+          }
+        }
+        if( iLvl>0 && pLvl[-1].nMerge && nTotal==0 ) rc = FTS5_CORRUPT;
+        if( iLvl==nLevel-1 && pLvl->nMerge ) rc = FTS5_CORRUPT;
+      }
+    }
+    if( nSegment!=0 && rc==SQLITE_OK ) rc = FTS5_CORRUPT;
+    if( bStructureV2 ){
+      pRet->nOriginCntr = nOriginCntr+1;
+    }
+
+    if( rc!=SQLITE_OK ){
+      fts5StructureRelease(pRet);
+      pRet = 0;
+    }
+  }
+
+  *ppOut = pRet;
+  return rc;
+}
+
+/*
+** Add a level to the Fts5Structure.aLevel[] array of structure object
+** (*ppStruct).
+*/
+static void fts5StructureAddLevel(int *pRc, Fts5Structure **ppStruct){
+  fts5StructureMakeWritable(pRc, ppStruct);
+  assert( (ppStruct!=0 && (*ppStruct)!=0) || (*pRc)!=SQLITE_OK );
+  if( *pRc==SQLITE_OK ){
+    Fts5Structure *pStruct = *ppStruct;
+    int nLevel = pStruct->nLevel;
+    sqlite3_int64 nByte = (
+        sizeof(Fts5Structure) +                  /* Main structure */
+        sizeof(Fts5StructureLevel) * (nLevel+1)  /* aLevel[] array */
+    );
+
+    pStruct = sqlite3_realloc64(pStruct, nByte);
+    if( pStruct ){
+      memset(&pStruct->aLevel[nLevel], 0, sizeof(Fts5StructureLevel));
+      pStruct->nLevel++;
+      *ppStruct = pStruct;
+    }else{
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+}
+
+/*
+** Extend level iLvl so that there is room for at least nExtra more
+** segments.
+*/
+static void fts5StructureExtendLevel(
+  int *pRc, 
+  Fts5Structure *pStruct, 
+  int iLvl, 
+  int nExtra, 
+  int bInsert
+){
+  if( *pRc==SQLITE_OK ){
+    Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+    Fts5StructureSegment *aNew;
+    sqlite3_int64 nByte;
+
+    nByte = (pLvl->nSeg + nExtra) * sizeof(Fts5StructureSegment);
+    aNew = sqlite3_realloc64(pLvl->aSeg, nByte);
+    if( aNew ){
+      if( bInsert==0 ){
+        memset(&aNew[pLvl->nSeg], 0, sizeof(Fts5StructureSegment) * nExtra);
+      }else{
+        int nMove = pLvl->nSeg * sizeof(Fts5StructureSegment);
+        memmove(&aNew[nExtra], aNew, nMove);
+        memset(aNew, 0, sizeof(Fts5StructureSegment) * nExtra);
+      }
+      pLvl->aSeg = aNew;
+    }else{
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+}
+
+static Fts5Structure *fts5StructureReadUncached(Fts5Index *p){
+  Fts5Structure *pRet = 0;
+  Fts5Config *pConfig = p->pConfig;
+  int iCookie;                    /* Configuration cookie */
+  Fts5Data *pData;
+
+  pData = fts5DataRead(p, FTS5_STRUCTURE_ROWID);
+  if( p->rc==SQLITE_OK ){
+    /* TODO: Do we need this if the leaf-index is appended? Probably... */
+    memset(&pData->p[pData->nn], 0, FTS5_DATA_PADDING);
+    p->rc = fts5StructureDecode(pData->p, pData->nn, &iCookie, &pRet);
+    if( p->rc==SQLITE_OK && (pConfig->pgsz==0 || pConfig->iCookie!=iCookie) ){
+      p->rc = sqlite3Fts5ConfigLoad(pConfig, iCookie);
+    }
+    fts5DataRelease(pData);
+    if( p->rc!=SQLITE_OK ){
+      fts5StructureRelease(pRet);
+      pRet = 0;
+    }
+  }
+
+  return pRet;
+}
+
+static i64 fts5IndexDataVersion(Fts5Index *p){
+  i64 iVersion = 0;
+
+  if( p->rc==SQLITE_OK ){
+    if( p->pDataVersion==0 ){
+      p->rc = fts5IndexPrepareStmt(p, &p->pDataVersion, 
+          sqlite3_mprintf("PRAGMA %Q.data_version", p->pConfig->zDb)
+          );
+      if( p->rc ) return 0;
+    }
+
+    if( SQLITE_ROW==sqlite3_step(p->pDataVersion) ){
+      iVersion = sqlite3_column_int64(p->pDataVersion, 0);
+    }
+    p->rc = sqlite3_reset(p->pDataVersion);
+  }
+
+  return iVersion;
+}
+
+/*
+** Read, deserialize and return the structure record.
+**
+** The Fts5Structure.aLevel[] and each Fts5StructureLevel.aSeg[] array
+** are over-allocated as described for function fts5StructureDecode() 
+** above.
+**
+** If an error occurs, NULL is returned and an error code left in the
+** Fts5Index handle. If an error has already occurred when this function
+** is called, it is a no-op.
+*/
+static Fts5Structure *fts5StructureRead(Fts5Index *p){
+
+  if( p->pStruct==0 ){
+    p->iStructVersion = fts5IndexDataVersion(p);
+    if( p->rc==SQLITE_OK ){
+      p->pStruct = fts5StructureReadUncached(p);
+    }
+  }
+
+#if 0
+  else{
+    Fts5Structure *pTest = fts5StructureReadUncached(p);
+    if( pTest ){
+      int i, j;
+      assert_nc( p->pStruct->nSegment==pTest->nSegment );
+      assert_nc( p->pStruct->nLevel==pTest->nLevel );
+      for(i=0; i<pTest->nLevel; i++){
+        assert_nc( p->pStruct->aLevel[i].nMerge==pTest->aLevel[i].nMerge );
+        assert_nc( p->pStruct->aLevel[i].nSeg==pTest->aLevel[i].nSeg );
+        for(j=0; j<pTest->aLevel[i].nSeg; j++){
+          Fts5StructureSegment *p1 = &pTest->aLevel[i].aSeg[j];
+          Fts5StructureSegment *p2 = &p->pStruct->aLevel[i].aSeg[j];
+          assert_nc( p1->iSegid==p2->iSegid );
+          assert_nc( p1->pgnoFirst==p2->pgnoFirst );
+          assert_nc( p1->pgnoLast==p2->pgnoLast );
+        }
+      }
+      fts5StructureRelease(pTest);
+    }
+  }
+#endif
+
+  if( p->rc!=SQLITE_OK ) return 0;
+  assert( p->iStructVersion!=0 );
+  assert( p->pStruct!=0 );
+  fts5StructureRef(p->pStruct);
+  return p->pStruct;
+}
+
+static void fts5StructureInvalidate(Fts5Index *p){
+  if( p->pStruct ){
+    fts5StructureRelease(p->pStruct);
+    p->pStruct = 0;
+  }
+}
+
+/*
+** Return the total number of segments in index structure pStruct. This
+** function is only ever used as part of assert() conditions.
+*/
+#ifdef SQLITE_DEBUG
+static int fts5StructureCountSegments(Fts5Structure *pStruct){
+  int nSegment = 0;               /* Total number of segments */
+  if( pStruct ){
+    int iLvl;                     /* Used to iterate through levels */
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      nSegment += pStruct->aLevel[iLvl].nSeg;
+    }
+  }
+
+  return nSegment;
+}
+#endif
+
+#define fts5BufferSafeAppendBlob(pBuf, pBlob, nBlob) {     \
+  assert( (pBuf)->nSpace>=((pBuf)->n+nBlob) );             \
+  memcpy(&(pBuf)->p[(pBuf)->n], pBlob, nBlob);             \
+  (pBuf)->n += nBlob;                                      \
+}
+
+#define fts5BufferSafeAppendVarint(pBuf, iVal) {                \
+  (pBuf)->n += sqlite3Fts5PutVarint(&(pBuf)->p[(pBuf)->n], (iVal));  \
+  assert( (pBuf)->nSpace>=(pBuf)->n );                          \
+}
+
+
+/*
+** Serialize and store the "structure" record.
+**
+** If an error occurs, leave an error code in the Fts5Index object. If an
+** error has already occurred, this function is a no-op.
+*/
+static void fts5StructureWrite(Fts5Index *p, Fts5Structure *pStruct){
+  if( p->rc==SQLITE_OK ){
+    Fts5Buffer buf;               /* Buffer to serialize record into */
+    int iLvl;                     /* Used to iterate through levels */
+    int iCookie;                  /* Cookie value to store */
+    int nHdr = (pStruct->nOriginCntr>0 ? (4+4+9+9+9) : (4+9+9));
+
+    assert( pStruct->nSegment==fts5StructureCountSegments(pStruct) );
+    memset(&buf, 0, sizeof(Fts5Buffer));
+
+    /* Append the current configuration cookie */
+    iCookie = p->pConfig->iCookie;
+    if( iCookie<0 ) iCookie = 0;
+
+    if( 0==sqlite3Fts5BufferSize(&p->rc, &buf, nHdr) ){
+      sqlite3Fts5Put32(buf.p, iCookie);
+      buf.n = 4;
+      if( pStruct->nOriginCntr>0 ){
+        fts5BufferSafeAppendBlob(&buf, FTS5_STRUCTURE_V2, 4);
+      }
+      fts5BufferSafeAppendVarint(&buf, pStruct->nLevel);
+      fts5BufferSafeAppendVarint(&buf, pStruct->nSegment);
+      fts5BufferSafeAppendVarint(&buf, (i64)pStruct->nWriteCounter);
+    }
+
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      int iSeg;                     /* Used to iterate through segments */
+      Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+      fts5BufferAppendVarint(&p->rc, &buf, pLvl->nMerge);
+      fts5BufferAppendVarint(&p->rc, &buf, pLvl->nSeg);
+      assert( pLvl->nMerge<=pLvl->nSeg );
+
+      for(iSeg=0; iSeg<pLvl->nSeg; iSeg++){
+        Fts5StructureSegment *pSeg = &pLvl->aSeg[iSeg];
+        fts5BufferAppendVarint(&p->rc, &buf, pSeg->iSegid);
+        fts5BufferAppendVarint(&p->rc, &buf, pSeg->pgnoFirst);
+        fts5BufferAppendVarint(&p->rc, &buf, pSeg->pgnoLast);
+        if( pStruct->nOriginCntr>0 ){
+          fts5BufferAppendVarint(&p->rc, &buf, pSeg->iOrigin1);
+          fts5BufferAppendVarint(&p->rc, &buf, pSeg->iOrigin2);
+          fts5BufferAppendVarint(&p->rc, &buf, pSeg->nPgTombstone);
+          fts5BufferAppendVarint(&p->rc, &buf, pSeg->nEntryTombstone);
+          fts5BufferAppendVarint(&p->rc, &buf, pSeg->nEntry);
+        }
+      }
+    }
+
+    fts5DataWrite(p, FTS5_STRUCTURE_ROWID, buf.p, buf.n);
+    fts5BufferFree(&buf);
+  }
+}
+
+#if 0
+static void fts5DebugStructure(int*,Fts5Buffer*,Fts5Structure*);
+static void fts5PrintStructure(const char *zCaption, Fts5Structure *pStruct){
+  int rc = SQLITE_OK;
+  Fts5Buffer buf;
+  memset(&buf, 0, sizeof(buf));
+  fts5DebugStructure(&rc, &buf, pStruct);
+  fprintf(stdout, "%s: %s\n", zCaption, buf.p);
+  fflush(stdout);
+  fts5BufferFree(&buf);
+}
+#else
+# define fts5PrintStructure(x,y)
+#endif
+
+static int fts5SegmentSize(Fts5StructureSegment *pSeg){
+  return 1 + pSeg->pgnoLast - pSeg->pgnoFirst;
+}
+
+/*
+** Return a copy of index structure pStruct. Except, promote as many 
+** segments as possible to level iPromote. If an OOM occurs, NULL is 
+** returned.
+*/
+static void fts5StructurePromoteTo(
+  Fts5Index *p,
+  int iPromote,
+  int szPromote,
+  Fts5Structure *pStruct
+){
+  int il, is;
+  Fts5StructureLevel *pOut = &pStruct->aLevel[iPromote];
+
+  if( pOut->nMerge==0 ){
+    for(il=iPromote+1; il<pStruct->nLevel; il++){
+      Fts5StructureLevel *pLvl = &pStruct->aLevel[il];
+      if( pLvl->nMerge ) return;
+      for(is=pLvl->nSeg-1; is>=0; is--){
+        int sz = fts5SegmentSize(&pLvl->aSeg[is]);
+        if( sz>szPromote ) return;
+        fts5StructureExtendLevel(&p->rc, pStruct, iPromote, 1, 1);
+        if( p->rc ) return;
+        memcpy(pOut->aSeg, &pLvl->aSeg[is], sizeof(Fts5StructureSegment));
+        pOut->nSeg++;
+        pLvl->nSeg--;
+      }
+    }
+  }
+}
+
+/*
+** A new segment has just been written to level iLvl of index structure
+** pStruct. This function determines if any segments should be promoted
+** as a result. Segments are promoted in two scenarios:
+**
+**   a) If the segment just written is smaller than one or more segments
+**      within the previous populated level, it is promoted to the previous
+**      populated level.
+**
+**   b) If the segment just written is larger than the newest segment on
+**      the next populated level, then that segment, and any other adjacent
+**      segments that are also smaller than the one just written, are 
+**      promoted. 
+**
+** If one or more segments are promoted, the structure object is updated
+** to reflect this.
+*/
+static void fts5StructurePromote(
+  Fts5Index *p,                   /* FTS5 backend object */
+  int iLvl,                       /* Index level just updated */
+  Fts5Structure *pStruct          /* Index structure */
+){
+  if( p->rc==SQLITE_OK ){
+    int iTst;
+    int iPromote = -1;
+    int szPromote = 0;            /* Promote anything this size or smaller */
+    Fts5StructureSegment *pSeg;   /* Segment just written */
+    int szSeg;                    /* Size of segment just written */
+    int nSeg = pStruct->aLevel[iLvl].nSeg;
+
+    if( nSeg==0 ) return;
+    pSeg = &pStruct->aLevel[iLvl].aSeg[pStruct->aLevel[iLvl].nSeg-1];
+    szSeg = (1 + pSeg->pgnoLast - pSeg->pgnoFirst);
+
+    /* Check for condition (a) */
+    for(iTst=iLvl-1; iTst>=0 && pStruct->aLevel[iTst].nSeg==0; iTst--);
+    if( iTst>=0 ){
+      int i;
+      int szMax = 0;
+      Fts5StructureLevel *pTst = &pStruct->aLevel[iTst];
+      assert( pTst->nMerge==0 );
+      for(i=0; i<pTst->nSeg; i++){
+        int sz = pTst->aSeg[i].pgnoLast - pTst->aSeg[i].pgnoFirst + 1;
+        if( sz>szMax ) szMax = sz;
+      }
+      if( szMax>=szSeg ){
+        /* Condition (a) is true. Promote the newest segment on level 
+        ** iLvl to level iTst.  */
+        iPromote = iTst;
+        szPromote = szMax;
+      }
+    }
+
+    /* If condition (a) is not met, assume (b) is true. StructurePromoteTo()
+    ** is a no-op if it is not.  */
+    if( iPromote<0 ){
+      iPromote = iLvl;
+      szPromote = szSeg;
+    }
+    fts5StructurePromoteTo(p, iPromote, szPromote, pStruct);
+  }
+}
+
+
+/*
+** Advance the iterator passed as the only argument. If the end of the 
+** doclist-index page is reached, return non-zero.
+*/
+static int fts5DlidxLvlNext(Fts5DlidxLvl *pLvl){
+  Fts5Data *pData = pLvl->pData;
+
+  if( pLvl->iOff==0 ){
+    assert( pLvl->bEof==0 );
+    pLvl->iOff = 1;
+    pLvl->iOff += fts5GetVarint32(&pData->p[1], pLvl->iLeafPgno);
+    pLvl->iOff += fts5GetVarint(&pData->p[pLvl->iOff], (u64*)&pLvl->iRowid);
+    pLvl->iFirstOff = pLvl->iOff;
+  }else{
+    int iOff;
+    for(iOff=pLvl->iOff; iOff<pData->nn; iOff++){
+      if( pData->p[iOff] ) break; 
+    }
+
+    if( iOff<pData->nn ){
+      u64 iVal;
+      pLvl->iLeafPgno += (iOff - pLvl->iOff) + 1;
+      iOff += fts5GetVarint(&pData->p[iOff], &iVal);
+      pLvl->iRowid += iVal;
+      pLvl->iOff = iOff;
+    }else{
+      pLvl->bEof = 1;
+    }
+  }
+
+  return pLvl->bEof;
+}
+
+/*
+** Advance the iterator passed as the only argument.
+*/
+static int fts5DlidxIterNextR(Fts5Index *p, Fts5DlidxIter *pIter, int iLvl){
+  Fts5DlidxLvl *pLvl = &pIter->aLvl[iLvl];
+
+  assert( iLvl<pIter->nLvl );
+  if( fts5DlidxLvlNext(pLvl) ){
+    if( (iLvl+1) < pIter->nLvl ){
+      fts5DlidxIterNextR(p, pIter, iLvl+1);
+      if( pLvl[1].bEof==0 ){
+        fts5DataRelease(pLvl->pData);
+        memset(pLvl, 0, sizeof(Fts5DlidxLvl));
+        pLvl->pData = fts5DataRead(p, 
+            FTS5_DLIDX_ROWID(pIter->iSegid, iLvl, pLvl[1].iLeafPgno)
+        );
+        if( pLvl->pData ) fts5DlidxLvlNext(pLvl);
+      }
+    }
+  }
+
+  return pIter->aLvl[0].bEof;
+}
+static int fts5DlidxIterNext(Fts5Index *p, Fts5DlidxIter *pIter){
+  return fts5DlidxIterNextR(p, pIter, 0);
+}
+
+/*
+** The iterator passed as the first argument has the following fields set
+** as follows. This function sets up the rest of the iterator so that it
+** points to the first rowid in the doclist-index.
+**
+**   pData:
+**     pointer to doclist-index record, 
+**
+** When this function is called pIter->iLeafPgno is the page number the
+** doclist is associated with (the one featuring the term).
+*/
+static int fts5DlidxIterFirst(Fts5DlidxIter *pIter){
+  int i;
+  for(i=0; i<pIter->nLvl; i++){
+    fts5DlidxLvlNext(&pIter->aLvl[i]);
+  }
+  return pIter->aLvl[0].bEof;
+}
+
+
+static int fts5DlidxIterEof(Fts5Index *p, Fts5DlidxIter *pIter){
+  return p->rc!=SQLITE_OK || pIter->aLvl[0].bEof;
+}
+
+static void fts5DlidxIterLast(Fts5Index *p, Fts5DlidxIter *pIter){
+  int i;
+
+  /* Advance each level to the last entry on the last page */
+  for(i=pIter->nLvl-1; p->rc==SQLITE_OK && i>=0; i--){
+    Fts5DlidxLvl *pLvl = &pIter->aLvl[i];
+    while( fts5DlidxLvlNext(pLvl)==0 );
+    pLvl->bEof = 0;
+
+    if( i>0 ){
+      Fts5DlidxLvl *pChild = &pLvl[-1];
+      fts5DataRelease(pChild->pData);
+      memset(pChild, 0, sizeof(Fts5DlidxLvl));
+      pChild->pData = fts5DataRead(p, 
+          FTS5_DLIDX_ROWID(pIter->iSegid, i-1, pLvl->iLeafPgno)
+      );
+    }
+  }
+}
+
+/*
+** Move the iterator passed as the only argument to the previous entry.
+*/
+static int fts5DlidxLvlPrev(Fts5DlidxLvl *pLvl){
+  int iOff = pLvl->iOff;
+
+  assert( pLvl->bEof==0 );
+  if( iOff<=pLvl->iFirstOff ){
+    pLvl->bEof = 1;
+  }else{
+    u8 *a = pLvl->pData->p;
+
+    pLvl->iOff = 0;
+    fts5DlidxLvlNext(pLvl);
+    while( 1 ){
+      int nZero = 0;
+      int ii = pLvl->iOff;
+      u64 delta = 0;
+
+      while( a[ii]==0 ){
+        nZero++;
+        ii++;
+      }
+      ii += sqlite3Fts5GetVarint(&a[ii], &delta);
+
+      if( ii>=iOff ) break;
+      pLvl->iLeafPgno += nZero+1;
+      pLvl->iRowid += delta;
+      pLvl->iOff = ii;
+    }
+  }
+
+  return pLvl->bEof;
+}
+
+static int fts5DlidxIterPrevR(Fts5Index *p, Fts5DlidxIter *pIter, int iLvl){
+  Fts5DlidxLvl *pLvl = &pIter->aLvl[iLvl];
+
+  assert( iLvl<pIter->nLvl );
+  if( fts5DlidxLvlPrev(pLvl) ){
+    if( (iLvl+1) < pIter->nLvl ){
+      fts5DlidxIterPrevR(p, pIter, iLvl+1);
+      if( pLvl[1].bEof==0 ){
+        fts5DataRelease(pLvl->pData);
+        memset(pLvl, 0, sizeof(Fts5DlidxLvl));
+        pLvl->pData = fts5DataRead(p, 
+            FTS5_DLIDX_ROWID(pIter->iSegid, iLvl, pLvl[1].iLeafPgno)
+        );
+        if( pLvl->pData ){
+          while( fts5DlidxLvlNext(pLvl)==0 );
+          pLvl->bEof = 0;
+        }
+      }
+    }
+  }
+
+  return pIter->aLvl[0].bEof;
+}
+static int fts5DlidxIterPrev(Fts5Index *p, Fts5DlidxIter *pIter){
+  return fts5DlidxIterPrevR(p, pIter, 0);
+}
+
+/*
+** Free a doclist-index iterator object allocated by fts5DlidxIterInit().
+*/
+static void fts5DlidxIterFree(Fts5DlidxIter *pIter){
+  if( pIter ){
+    int i;
+    for(i=0; i<pIter->nLvl; i++){
+      fts5DataRelease(pIter->aLvl[i].pData);
+    }
+    sqlite3_free(pIter);
+  }
+}
+
+static Fts5DlidxIter *fts5DlidxIterInit(
+  Fts5Index *p,                   /* Fts5 Backend to iterate within */
+  int bRev,                       /* True for ORDER BY ASC */
+  int iSegid,                     /* Segment id */
+  int iLeafPg                     /* Leaf page number to load dlidx for */
+){
+  Fts5DlidxIter *pIter = 0;
+  int i;
+  int bDone = 0;
+
+  for(i=0; p->rc==SQLITE_OK && bDone==0; i++){
+    sqlite3_int64 nByte = sizeof(Fts5DlidxIter) + i * sizeof(Fts5DlidxLvl);
+    Fts5DlidxIter *pNew;
+
+    pNew = (Fts5DlidxIter*)sqlite3_realloc64(pIter, nByte);
+    if( pNew==0 ){
+      p->rc = SQLITE_NOMEM;
+    }else{
+      i64 iRowid = FTS5_DLIDX_ROWID(iSegid, i, iLeafPg);
+      Fts5DlidxLvl *pLvl = &pNew->aLvl[i];
+      pIter = pNew;
+      memset(pLvl, 0, sizeof(Fts5DlidxLvl));
+      pLvl->pData = fts5DataRead(p, iRowid);
+      if( pLvl->pData && (pLvl->pData->p[0] & 0x0001)==0 ){
+        bDone = 1;
+      }
+      pIter->nLvl = i+1;
+    }
+  }
+
+  if( p->rc==SQLITE_OK ){
+    pIter->iSegid = iSegid;
+    if( bRev==0 ){
+      fts5DlidxIterFirst(pIter);
+    }else{
+      fts5DlidxIterLast(p, pIter);
+    }
+  }
+
+  if( p->rc!=SQLITE_OK ){
+    fts5DlidxIterFree(pIter);
+    pIter = 0;
+  }
+
+  return pIter;
+}
+
+static i64 fts5DlidxIterRowid(Fts5DlidxIter *pIter){
+  return pIter->aLvl[0].iRowid;
+}
+static int fts5DlidxIterPgno(Fts5DlidxIter *pIter){
+  return pIter->aLvl[0].iLeafPgno;
+}
+
+/*
+** Load the next leaf page into the segment iterator.
+*/
+static void fts5SegIterNextPage(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter              /* Iterator to advance to next page */
+){
+  Fts5Data *pLeaf;
+  Fts5StructureSegment *pSeg = pIter->pSeg;
+  fts5DataRelease(pIter->pLeaf);
+  pIter->iLeafPgno++;
+  if( pIter->pNextLeaf ){
+    pIter->pLeaf = pIter->pNextLeaf;
+    pIter->pNextLeaf = 0;
+  }else if( pIter->iLeafPgno<=pSeg->pgnoLast ){
+    pIter->pLeaf = fts5LeafRead(p, 
+        FTS5_SEGMENT_ROWID(pSeg->iSegid, pIter->iLeafPgno)
+    );
+  }else{
+    pIter->pLeaf = 0;
+  }
+  pLeaf = pIter->pLeaf;
+
+  if( pLeaf ){
+    pIter->iPgidxOff = pLeaf->szLeaf;
+    if( fts5LeafIsTermless(pLeaf) ){
+      pIter->iEndofDoclist = pLeaf->nn+1;
+    }else{
+      pIter->iPgidxOff += fts5GetVarint32(&pLeaf->p[pIter->iPgidxOff],
+          pIter->iEndofDoclist
+      );
+    }
+  }
+}
+
+/*
+** Argument p points to a buffer containing a varint to be interpreted as a
+** position list size field. Read the varint and return the number of bytes
+** read. Before returning, set *pnSz to the number of bytes in the position
+** list, and *pbDel to true if the delete flag is set, or false otherwise.
+*/
+static int fts5GetPoslistSize(const u8 *p, int *pnSz, int *pbDel){
+  int nSz;
+  int n = 0;
+  fts5FastGetVarint32(p, n, nSz);
+  assert_nc( nSz>=0 );
+  *pnSz = nSz/2;
+  *pbDel = nSz & 0x0001;
+  return n;
+}
+
+/*
+** Fts5SegIter.iLeafOffset currently points to the first byte of a
+** position-list size field. Read the value of the field and store it
+** in the following variables:
+**
+**   Fts5SegIter.nPos
+**   Fts5SegIter.bDel
+**
+** Leave Fts5SegIter.iLeafOffset pointing to the first byte of the 
+** position list content (if any).
+*/
+static void fts5SegIterLoadNPos(Fts5Index *p, Fts5SegIter *pIter){
+  if( p->rc==SQLITE_OK ){
+    int iOff = pIter->iLeafOffset;  /* Offset to read at */
+    ASSERT_SZLEAF_OK(pIter->pLeaf);
+    if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
+      int iEod = MIN(pIter->iEndofDoclist, pIter->pLeaf->szLeaf);
+      pIter->bDel = 0;
+      pIter->nPos = 1;
+      if( iOff<iEod && pIter->pLeaf->p[iOff]==0 ){
+        pIter->bDel = 1;
+        iOff++;
+        if( iOff<iEod && pIter->pLeaf->p[iOff]==0 ){
+          pIter->nPos = 1;
+          iOff++;
+        }else{
+          pIter->nPos = 0;
+        }
+      }
+    }else{
+      int nSz;
+      fts5FastGetVarint32(pIter->pLeaf->p, iOff, nSz);
+      pIter->bDel = (nSz & 0x0001);
+      pIter->nPos = nSz>>1;
+      assert_nc( pIter->nPos>=0 );
+    }
+    pIter->iLeafOffset = iOff;
+  }
+}
+
+static void fts5SegIterLoadRowid(Fts5Index *p, Fts5SegIter *pIter){
+  u8 *a = pIter->pLeaf->p;        /* Buffer to read data from */
+  i64 iOff = pIter->iLeafOffset;
+
+  ASSERT_SZLEAF_OK(pIter->pLeaf);
+  while( iOff>=pIter->pLeaf->szLeaf ){
+    fts5SegIterNextPage(p, pIter);
+    if( pIter->pLeaf==0 ){
+      if( p->rc==SQLITE_OK ) p->rc = FTS5_CORRUPT;
+      return;
+    }
+    iOff = 4;
+    a = pIter->pLeaf->p;
+  }
+  iOff += sqlite3Fts5GetVarint(&a[iOff], (u64*)&pIter->iRowid);
+  pIter->iLeafOffset = iOff;
+}
+
+/*
+** Fts5SegIter.iLeafOffset currently points to the first byte of the 
+** "nSuffix" field of a term. Function parameter nKeep contains the value
+** of the "nPrefix" field (if there was one - it is passed 0 if this is
+** the first term in the segment).
+**
+** This function populates:
+**
+**   Fts5SegIter.term
+**   Fts5SegIter.rowid
+**
+** accordingly and leaves (Fts5SegIter.iLeafOffset) set to the content of
+** the first position list. The position list belonging to document 
+** (Fts5SegIter.iRowid).
+*/
+static void fts5SegIterLoadTerm(Fts5Index *p, Fts5SegIter *pIter, int nKeep){
+  u8 *a = pIter->pLeaf->p;        /* Buffer to read data from */
+  i64 iOff = pIter->iLeafOffset;  /* Offset to read at */
+  int nNew;                       /* Bytes of new data */
+
+  iOff += fts5GetVarint32(&a[iOff], nNew);
+  if( iOff+nNew>pIter->pLeaf->szLeaf || nKeep>pIter->term.n || nNew==0 ){
+    p->rc = FTS5_CORRUPT;
+    return;
+  }
+  pIter->term.n = nKeep;
+  fts5BufferAppendBlob(&p->rc, &pIter->term, nNew, &a[iOff]);
+  assert( pIter->term.n<=pIter->term.nSpace );
+  iOff += nNew;
+  pIter->iTermLeafOffset = iOff;
+  pIter->iTermLeafPgno = pIter->iLeafPgno;
+  pIter->iLeafOffset = iOff;
+
+  if( pIter->iPgidxOff>=pIter->pLeaf->nn ){
+    pIter->iEndofDoclist = pIter->pLeaf->nn+1;
+  }else{
+    int nExtra;
+    pIter->iPgidxOff += fts5GetVarint32(&a[pIter->iPgidxOff], nExtra);
+    pIter->iEndofDoclist += nExtra;
+  }
+
+  fts5SegIterLoadRowid(p, pIter);
+}
+
+static void fts5SegIterNext(Fts5Index*, Fts5SegIter*, int*);
+static void fts5SegIterNext_Reverse(Fts5Index*, Fts5SegIter*, int*);
+static void fts5SegIterNext_None(Fts5Index*, Fts5SegIter*, int*);
+
+static void fts5SegIterSetNext(Fts5Index *p, Fts5SegIter *pIter){
+  if( pIter->flags & FTS5_SEGITER_REVERSE ){
+    pIter->xNext = fts5SegIterNext_Reverse;
+  }else if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
+    pIter->xNext = fts5SegIterNext_None;
+  }else{
+    pIter->xNext = fts5SegIterNext;
+  }
+}
+
+/*
+** Allocate a tombstone hash page array object (pIter->pTombArray) for 
+** the iterator passed as the second argument. If an OOM error occurs, 
+** leave an error in the Fts5Index object.
+*/
+static void fts5SegIterAllocTombstone(Fts5Index *p, Fts5SegIter *pIter){
+  const int nTomb = pIter->pSeg->nPgTombstone;
+  if( nTomb>0 ){
+    int nByte = nTomb * sizeof(Fts5Data*) + sizeof(Fts5TombstoneArray);
+    Fts5TombstoneArray *pNew;
+    pNew = (Fts5TombstoneArray*)sqlite3Fts5MallocZero(&p->rc, nByte);
+    if( pNew ){
+      pNew->nTombstone = nTomb;
+      pNew->nRef = 1;
+      pIter->pTombArray = pNew;
+    }
+  }
+}
+
+/*
+** Initialize the iterator object pIter to iterate through the entries in
+** segment pSeg. The iterator is left pointing to the first entry when 
+** this function returns.
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. If 
+** an error has already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterInit(
+  Fts5Index *p,                   /* FTS index object */
+  Fts5StructureSegment *pSeg,     /* Description of segment */
+  Fts5SegIter *pIter              /* Object to populate */
+){
+  if( pSeg->pgnoFirst==0 ){
+    /* This happens if the segment is being used as an input to an incremental
+    ** merge and all data has already been "trimmed". See function
+    ** fts5TrimSegments() for details. In this case leave the iterator empty.
+    ** The caller will see the (pIter->pLeaf==0) and assume the iterator is
+    ** at EOF already. */
+    assert( pIter->pLeaf==0 );
+    return;
+  }
+
+  if( p->rc==SQLITE_OK ){
+    memset(pIter, 0, sizeof(*pIter));
+    fts5SegIterSetNext(p, pIter);
+    pIter->pSeg = pSeg;
+    pIter->iLeafPgno = pSeg->pgnoFirst-1;
+    do {
+      fts5SegIterNextPage(p, pIter);
+    }while( p->rc==SQLITE_OK && pIter->pLeaf && pIter->pLeaf->nn==4 );
+  }
+
+  if( p->rc==SQLITE_OK && pIter->pLeaf ){
+    pIter->iLeafOffset = 4;
+    assert( pIter->pLeaf!=0 );
+    assert_nc( pIter->pLeaf->nn>4 );
+    assert_nc( fts5LeafFirstTermOff(pIter->pLeaf)==4 );
+    pIter->iPgidxOff = pIter->pLeaf->szLeaf+1;
+    fts5SegIterLoadTerm(p, pIter, 0);
+    fts5SegIterLoadNPos(p, pIter);
+    fts5SegIterAllocTombstone(p, pIter);
+  }
+}
+
+/*
+** This function is only ever called on iterators created by calls to
+** Fts5IndexQuery() with the FTS5INDEX_QUERY_DESC flag set.
+**
+** The iterator is in an unusual state when this function is called: the
+** Fts5SegIter.iLeafOffset variable is set to the offset of the start of
+** the position-list size field for the first relevant rowid on the page.
+** Fts5SegIter.rowid is set, but nPos and bDel are not.
+**
+** This function advances the iterator so that it points to the last 
+** relevant rowid on the page and, if necessary, initializes the 
+** aRowidOffset[] and iRowidOffset variables. At this point the iterator
+** is in its regular state - Fts5SegIter.iLeafOffset points to the first
+** byte of the position list content associated with said rowid.
+*/
+static void fts5SegIterReverseInitPage(Fts5Index *p, Fts5SegIter *pIter){
+  int eDetail = p->pConfig->eDetail;
+  int n = pIter->pLeaf->szLeaf;
+  int i = pIter->iLeafOffset;
+  u8 *a = pIter->pLeaf->p;
+  int iRowidOffset = 0;
+
+  if( n>pIter->iEndofDoclist ){
+    n = pIter->iEndofDoclist;
+  }
+
+  ASSERT_SZLEAF_OK(pIter->pLeaf);
+  while( 1 ){
+    u64 iDelta = 0;
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      /* todo */
+      if( i<n && a[i]==0 ){
+        i++;
+        if( i<n && a[i]==0 ) i++;
+      }
+    }else{
+      int nPos;
+      int bDummy;
+      i += fts5GetPoslistSize(&a[i], &nPos, &bDummy);
+      i += nPos;
+    }
+    if( i>=n ) break;
+    i += fts5GetVarint(&a[i], &iDelta);
+    pIter->iRowid += iDelta;
+
+    /* If necessary, grow the pIter->aRowidOffset[] array. */
+    if( iRowidOffset>=pIter->nRowidOffset ){
+      int nNew = pIter->nRowidOffset + 8;
+      int *aNew = (int*)sqlite3_realloc64(pIter->aRowidOffset,nNew*sizeof(int));
+      if( aNew==0 ){
+        p->rc = SQLITE_NOMEM;
+        break;
+      }
+      pIter->aRowidOffset = aNew;
+      pIter->nRowidOffset = nNew;
+    }
+
+    pIter->aRowidOffset[iRowidOffset++] = pIter->iLeafOffset;
+    pIter->iLeafOffset = i;
+  }
+  pIter->iRowidOffset = iRowidOffset;
+  fts5SegIterLoadNPos(p, pIter);
+}
+
+/*
+**
+*/
+static void fts5SegIterReverseNewPage(Fts5Index *p, Fts5SegIter *pIter){
+  assert( pIter->flags & FTS5_SEGITER_REVERSE );
+  assert( pIter->flags & FTS5_SEGITER_ONETERM );
+
+  fts5DataRelease(pIter->pLeaf);
+  pIter->pLeaf = 0;
+  while( p->rc==SQLITE_OK && pIter->iLeafPgno>pIter->iTermLeafPgno ){
+    Fts5Data *pNew;
+    pIter->iLeafPgno--;
+    pNew = fts5DataRead(p, FTS5_SEGMENT_ROWID(
+          pIter->pSeg->iSegid, pIter->iLeafPgno
+    ));
+    if( pNew ){
+      /* iTermLeafOffset may be equal to szLeaf if the term is the last
+      ** thing on the page - i.e. the first rowid is on the following page.
+      ** In this case leave pIter->pLeaf==0, this iterator is at EOF. */
+      if( pIter->iLeafPgno==pIter->iTermLeafPgno ){
+        assert( pIter->pLeaf==0 );
+        if( pIter->iTermLeafOffset<pNew->szLeaf ){
+          pIter->pLeaf = pNew;
+          pIter->iLeafOffset = pIter->iTermLeafOffset;
+        }
+      }else{
+        int iRowidOff;
+        iRowidOff = fts5LeafFirstRowidOff(pNew);
+        if( iRowidOff ){
+          if( iRowidOff>=pNew->szLeaf ){
+            p->rc = FTS5_CORRUPT;
+          }else{
+            pIter->pLeaf = pNew;
+            pIter->iLeafOffset = iRowidOff;
+          }
+        }
+      }
+
+      if( pIter->pLeaf ){
+        u8 *a = &pIter->pLeaf->p[pIter->iLeafOffset];
+        pIter->iLeafOffset += fts5GetVarint(a, (u64*)&pIter->iRowid);
+        break;
+      }else{
+        fts5DataRelease(pNew);
+      }
+    }
+  }
+
+  if( pIter->pLeaf ){
+    pIter->iEndofDoclist = pIter->pLeaf->nn+1;
+    fts5SegIterReverseInitPage(p, pIter);
+  }
+}
+
+/*
+** Return true if the iterator passed as the second argument currently
+** points to a delete marker. A delete marker is an entry with a 0 byte
+** position-list.
+*/
+static int fts5MultiIterIsEmpty(Fts5Index *p, Fts5Iter *pIter){
+  Fts5SegIter *pSeg = &pIter->aSeg[pIter->aFirst[1].iFirst];
+  return (p->rc==SQLITE_OK && pSeg->pLeaf && pSeg->nPos==0);
+}
+
+/*
+** Advance iterator pIter to the next entry.
+**
+** This version of fts5SegIterNext() is only used by reverse iterators.
+*/
+static void fts5SegIterNext_Reverse(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int *pbUnused                   /* Unused */
+){
+  assert( pIter->flags & FTS5_SEGITER_REVERSE );
+  assert( pIter->pNextLeaf==0 );
+  UNUSED_PARAM(pbUnused);
+
+  if( pIter->iRowidOffset>0 ){
+    u8 *a = pIter->pLeaf->p;
+    int iOff;
+    u64 iDelta;
+
+    pIter->iRowidOffset--;
+    pIter->iLeafOffset = pIter->aRowidOffset[pIter->iRowidOffset];
+    fts5SegIterLoadNPos(p, pIter);
+    iOff = pIter->iLeafOffset;
+    if( p->pConfig->eDetail!=FTS5_DETAIL_NONE ){
+      iOff += pIter->nPos;
+    }
+    fts5GetVarint(&a[iOff], &iDelta);
+    pIter->iRowid -= iDelta;
+  }else{
+    fts5SegIterReverseNewPage(p, pIter);
+  }
+}
+
+/*
+** Advance iterator pIter to the next entry.
+**
+** This version of fts5SegIterNext() is only used if detail=none and the
+** iterator is not a reverse direction iterator.
+*/
+static void fts5SegIterNext_None(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int *pbNewTerm                  /* OUT: Set for new term */
+){
+  int iOff;
+
+  assert( p->rc==SQLITE_OK );
+  assert( (pIter->flags & FTS5_SEGITER_REVERSE)==0 );
+  assert( p->pConfig->eDetail==FTS5_DETAIL_NONE );
+
+  ASSERT_SZLEAF_OK(pIter->pLeaf);
+  iOff = pIter->iLeafOffset;
+
+  /* Next entry is on the next page */
+  while( pIter->pSeg && iOff>=pIter->pLeaf->szLeaf ){
+    fts5SegIterNextPage(p, pIter);
+    if( p->rc || pIter->pLeaf==0 ) return;
+    pIter->iRowid = 0;
+    iOff = 4;
+  }
+
+  if( iOff<pIter->iEndofDoclist ){
+    /* Next entry is on the current page */
+    i64 iDelta;
+    iOff += sqlite3Fts5GetVarint(&pIter->pLeaf->p[iOff], (u64*)&iDelta);
+    pIter->iLeafOffset = iOff;
+    pIter->iRowid += iDelta;
+  }else if( (pIter->flags & FTS5_SEGITER_ONETERM)==0 ){
+    if( pIter->pSeg ){
+      int nKeep = 0;
+      if( iOff!=fts5LeafFirstTermOff(pIter->pLeaf) ){
+        iOff += fts5GetVarint32(&pIter->pLeaf->p[iOff], nKeep);
+      }
+      pIter->iLeafOffset = iOff;
+      fts5SegIterLoadTerm(p, pIter, nKeep);
+    }else{
+      const u8 *pList = 0;
+      const char *zTerm = 0;
+      int nTerm = 0;
+      int nList;
+      sqlite3Fts5HashScanNext(p->pHash);
+      sqlite3Fts5HashScanEntry(p->pHash, &zTerm, &nTerm, &pList, &nList);
+      if( pList==0 ) goto next_none_eof;
+      pIter->pLeaf->p = (u8*)pList;
+      pIter->pLeaf->nn = nList;
+      pIter->pLeaf->szLeaf = nList;
+      pIter->iEndofDoclist = nList;
+      sqlite3Fts5BufferSet(&p->rc,&pIter->term, nTerm, (u8*)zTerm);
+      pIter->iLeafOffset = fts5GetVarint(pList, (u64*)&pIter->iRowid);
+    }
+
+    if( pbNewTerm ) *pbNewTerm = 1;
+  }else{
+    goto next_none_eof;
+  }
+
+  fts5SegIterLoadNPos(p, pIter);
+
+  return;
+ next_none_eof:
+  fts5DataRelease(pIter->pLeaf);
+  pIter->pLeaf = 0;
+}
+
+
+/*
+** Advance iterator pIter to the next entry. 
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. It 
+** is not considered an error if the iterator reaches EOF. If an error has 
+** already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterNext(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int *pbNewTerm                  /* OUT: Set for new term */
+){
+  Fts5Data *pLeaf = pIter->pLeaf;
+  int iOff;
+  int bNewTerm = 0;
+  int nKeep = 0;
+  u8 *a;
+  int n;
+
+  assert( pbNewTerm==0 || *pbNewTerm==0 );
+  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );
+
+  /* Search for the end of the position list within the current page. */
+  a = pLeaf->p;
+  n = pLeaf->szLeaf;
+
+  ASSERT_SZLEAF_OK(pLeaf);
+  iOff = pIter->iLeafOffset + pIter->nPos;
+
+  if( iOff<n ){
+    /* The next entry is on the current page. */
+    assert_nc( iOff<=pIter->iEndofDoclist );
+    if( iOff>=pIter->iEndofDoclist ){
+      bNewTerm = 1;
+      if( iOff!=fts5LeafFirstTermOff(pLeaf) ){
+        iOff += fts5GetVarint32(&a[iOff], nKeep);
+      }
+    }else{
+      u64 iDelta;
+      iOff += sqlite3Fts5GetVarint(&a[iOff], &iDelta);
+      pIter->iRowid += iDelta;
+      assert_nc( iDelta>0 );
+    }
+    pIter->iLeafOffset = iOff;
+
+  }else if( pIter->pSeg==0 ){
+    const u8 *pList = 0;
+    const char *zTerm = 0;
+    int nTerm = 0;
+    int nList = 0;
+    assert( (pIter->flags & FTS5_SEGITER_ONETERM) || pbNewTerm );
+    if( 0==(pIter->flags & FTS5_SEGITER_ONETERM) ){
+      sqlite3Fts5HashScanNext(p->pHash);
+      sqlite3Fts5HashScanEntry(p->pHash, &zTerm, &nTerm, &pList, &nList);
+    }
+    if( pList==0 ){
+      fts5DataRelease(pIter->pLeaf);
+      pIter->pLeaf = 0;
+    }else{
+      pIter->pLeaf->p = (u8*)pList;
+      pIter->pLeaf->nn = nList;
+      pIter->pLeaf->szLeaf = nList;
+      pIter->iEndofDoclist = nList+1;
+      sqlite3Fts5BufferSet(&p->rc, &pIter->term, nTerm, (u8*)zTerm);
+      pIter->iLeafOffset = fts5GetVarint(pList, (u64*)&pIter->iRowid);
+      *pbNewTerm = 1;
+    }
+  }else{
+    iOff = 0;
+    /* Next entry is not on the current page */
+    while( iOff==0 ){
+      fts5SegIterNextPage(p, pIter);
+      pLeaf = pIter->pLeaf;
+      if( pLeaf==0 ) break;
+      ASSERT_SZLEAF_OK(pLeaf);
+      if( (iOff = fts5LeafFirstRowidOff(pLeaf)) && iOff<pLeaf->szLeaf ){
+        iOff += sqlite3Fts5GetVarint(&pLeaf->p[iOff], (u64*)&pIter->iRowid);
+        pIter->iLeafOffset = iOff;
+
+        if( pLeaf->nn>pLeaf->szLeaf ){
+          pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
+              &pLeaf->p[pLeaf->szLeaf], pIter->iEndofDoclist
+          );
+        }
+      }
+      else if( pLeaf->nn>pLeaf->szLeaf ){
+        pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
+            &pLeaf->p[pLeaf->szLeaf], iOff
+        );
+        pIter->iLeafOffset = iOff;
+        pIter->iEndofDoclist = iOff;
+        bNewTerm = 1;
+      }
+      assert_nc( iOff<pLeaf->szLeaf );
+      if( iOff>pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+        return;
+      }
+    }
+  }
+
+  /* Check if the iterator is now at EOF. If so, return early. */
+  if( pIter->pLeaf ){
+    if( bNewTerm ){
+      if( pIter->flags & FTS5_SEGITER_ONETERM ){
+        fts5DataRelease(pIter->pLeaf);
+        pIter->pLeaf = 0;
+      }else{
+        fts5SegIterLoadTerm(p, pIter, nKeep);
+        fts5SegIterLoadNPos(p, pIter);
+        if( pbNewTerm ) *pbNewTerm = 1;
+      }
+    }else{
+      /* The following could be done by calling fts5SegIterLoadNPos(). But
+      ** this block is particularly performance critical, so equivalent
+      ** code is inlined.  */
+      int nSz;
+      assert_nc( pIter->iLeafOffset<=pIter->pLeaf->nn );
+      fts5FastGetVarint32(pIter->pLeaf->p, pIter->iLeafOffset, nSz);
+      pIter->bDel = (nSz & 0x0001);
+      pIter->nPos = nSz>>1;
+      assert_nc( pIter->nPos>=0 );
+    }
+  }
+}
+
+#define SWAPVAL(T, a, b) { T tmp; tmp=a; a=b; b=tmp; }
+
+#define fts5IndexSkipVarint(a, iOff) {            \
+  int iEnd = iOff+9;                              \
+  while( (a[iOff++] & 0x80) && iOff<iEnd );       \
+}
+
+/*
+** Iterator pIter currently points to the first rowid in a doclist. This
+** function sets the iterator up so that iterates in reverse order through
+** the doclist.
+*/
+static void fts5SegIterReverse(Fts5Index *p, Fts5SegIter *pIter){
+  Fts5DlidxIter *pDlidx = pIter->pDlidx;
+  Fts5Data *pLast = 0;
+  int pgnoLast = 0;
+
+  if( pDlidx && p->pConfig->iVersion==FTS5_CURRENT_VERSION ){
+    int iSegid = pIter->pSeg->iSegid;
+    pgnoLast = fts5DlidxIterPgno(pDlidx);
+    pLast = fts5LeafRead(p, FTS5_SEGMENT_ROWID(iSegid, pgnoLast));
+  }else{
+    Fts5Data *pLeaf = pIter->pLeaf;         /* Current leaf data */
+
+    /* Currently, Fts5SegIter.iLeafOffset points to the first byte of
+    ** position-list content for the current rowid. Back it up so that it
+    ** points to the start of the position-list size field. */
+    int iPoslist;
+    if( pIter->iTermLeafPgno==pIter->iLeafPgno ){
+      iPoslist = pIter->iTermLeafOffset;
+    }else{
+      iPoslist = 4;
+    }
+    fts5IndexSkipVarint(pLeaf->p, iPoslist);
+    pIter->iLeafOffset = iPoslist;
+
+    /* If this condition is true then the largest rowid for the current
+    ** term may not be stored on the current page. So search forward to
+    ** see where said rowid really is.  */
+    if( pIter->iEndofDoclist>=pLeaf->szLeaf ){
+      int pgno;
+      Fts5StructureSegment *pSeg = pIter->pSeg;
+
+      /* The last rowid in the doclist may not be on the current page. Search
+      ** forward to find the page containing the last rowid.  */
+      for(pgno=pIter->iLeafPgno+1; !p->rc && pgno<=pSeg->pgnoLast; pgno++){
+        i64 iAbs = FTS5_SEGMENT_ROWID(pSeg->iSegid, pgno);
+        Fts5Data *pNew = fts5LeafRead(p, iAbs);
+        if( pNew ){
+          int iRowid, bTermless;
+          iRowid = fts5LeafFirstRowidOff(pNew);
+          bTermless = fts5LeafIsTermless(pNew);
+          if( iRowid ){
+            SWAPVAL(Fts5Data*, pNew, pLast);
+            pgnoLast = pgno;
+          }
+          fts5DataRelease(pNew);
+          if( bTermless==0 ) break;
+        }
+      }
+    }
+  }
+
+  /* If pLast is NULL at this point, then the last rowid for this doclist
+  ** lies on the page currently indicated by the iterator. In this case 
+  ** pIter->iLeafOffset is already set to point to the position-list size
+  ** field associated with the first relevant rowid on the page.
+  **
+  ** Or, if pLast is non-NULL, then it is the page that contains the last
+  ** rowid. In this case configure the iterator so that it points to the
+  ** first rowid on this page.
+  */
+  if( pLast ){
+    int iOff;
+    fts5DataRelease(pIter->pLeaf);
+    pIter->pLeaf = pLast;
+    pIter->iLeafPgno = pgnoLast;
+    iOff = fts5LeafFirstRowidOff(pLast);
+    if( iOff>pLast->szLeaf ){
+      p->rc = FTS5_CORRUPT;
+      return;
+    }
+    iOff += fts5GetVarint(&pLast->p[iOff], (u64*)&pIter->iRowid);
+    pIter->iLeafOffset = iOff;
+
+    if( fts5LeafIsTermless(pLast) ){
+      pIter->iEndofDoclist = pLast->nn+1;
+    }else{
+      pIter->iEndofDoclist = fts5LeafFirstTermOff(pLast);
+    }
+  }
+
+  fts5SegIterReverseInitPage(p, pIter);
+}
+
+/*
+** Iterator pIter currently points to the first rowid of a doclist.
+** There is a doclist-index associated with the final term on the current 
+** page. If the current term is the last term on the page, load the 
+** doclist-index from disk and initialize an iterator at (pIter->pDlidx).
+*/
+static void fts5SegIterLoadDlidx(Fts5Index *p, Fts5SegIter *pIter){
+  int iSeg = pIter->pSeg->iSegid;
+  int bRev = (pIter->flags & FTS5_SEGITER_REVERSE);
+  Fts5Data *pLeaf = pIter->pLeaf; /* Current leaf data */
+
+  assert( pIter->flags & FTS5_SEGITER_ONETERM );
+  assert( pIter->pDlidx==0 );
+
+  /* Check if the current doclist ends on this page. If it does, return
+  ** early without loading the doclist-index (as it belongs to a different
+  ** term. */
+  if( pIter->iTermLeafPgno==pIter->iLeafPgno 
+   && pIter->iEndofDoclist<pLeaf->szLeaf 
+  ){
+    return;
+  }
+
+  pIter->pDlidx = fts5DlidxIterInit(p, bRev, iSeg, pIter->iTermLeafPgno);
+}
+
+/*
+** The iterator object passed as the second argument currently contains
+** no valid values except for the Fts5SegIter.pLeaf member variable. This
+** function searches the leaf page for a term matching (pTerm/nTerm).
+**
+** If the specified term is found on the page, then the iterator is left
+** pointing to it. If argument bGe is zero and the term is not found,
+** the iterator is left pointing at EOF.
+**
+** If bGe is non-zero and the specified term is not found, then the
+** iterator is left pointing to the smallest term in the segment that
+** is larger than the specified term, even if this term is not on the
+** current page.
+*/
+static void fts5LeafSeek(
+  Fts5Index *p,                   /* Leave any error code here */
+  int bGe,                        /* True for a >= search */
+  Fts5SegIter *pIter,             /* Iterator to seek */
+  const u8 *pTerm, int nTerm      /* Term to search for */
+){
+  u32 iOff;
+  const u8 *a = pIter->pLeaf->p;
+  u32 n = (u32)pIter->pLeaf->nn;
+
+  u32 nMatch = 0;
+  u32 nKeep = 0;
+  u32 nNew = 0;
+  u32 iTermOff;
+  u32 iPgidx;                     /* Current offset in pgidx */
+  int bEndOfPage = 0;
+
+  assert( p->rc==SQLITE_OK );
+
+  iPgidx = (u32)pIter->pLeaf->szLeaf;
+  iPgidx += fts5GetVarint32(&a[iPgidx], iTermOff);
+  iOff = iTermOff;
+  if( iOff>n ){
+    p->rc = FTS5_CORRUPT;
+    return;
+  }
+
+  while( 1 ){
+
+    /* Figure out how many new bytes are in this term */
+    fts5FastGetVarint32(a, iOff, nNew);
+    if( nKeep<nMatch ){
+      goto search_failed;
+    }
+
+    assert( nKeep>=nMatch );
+    if( nKeep==nMatch ){
+      u32 nCmp;
+      u32 i;
+      nCmp = (u32)MIN(nNew, nTerm-nMatch);
+      for(i=0; i<nCmp; i++){
+        if( a[iOff+i]!=pTerm[nMatch+i] ) break;
+      }
+      nMatch += i;
+
+      if( (u32)nTerm==nMatch ){
+        if( i==nNew ){
+          goto search_success;
+        }else{
+          goto search_failed;
+        }
+      }else if( i<nNew && a[iOff+i]>pTerm[nMatch] ){
+        goto search_failed;
+      }
+    }
+
+    if( iPgidx>=n ){
+      bEndOfPage = 1;
+      break;
+    }
+
+    iPgidx += fts5GetVarint32(&a[iPgidx], nKeep);
+    iTermOff += nKeep;
+    iOff = iTermOff;
+
+    if( iOff>=n ){
+      p->rc = FTS5_CORRUPT;
+      return;
+    }
+
+    /* Read the nKeep field of the next term. */
+    fts5FastGetVarint32(a, iOff, nKeep);
+  }
+
+ search_failed:
+  if( bGe==0 ){
+    fts5DataRelease(pIter->pLeaf);
+    pIter->pLeaf = 0;
+    return;
+  }else if( bEndOfPage ){
+    do {
+      fts5SegIterNextPage(p, pIter);
+      if( pIter->pLeaf==0 ) return;
+      a = pIter->pLeaf->p;
+      if( fts5LeafIsTermless(pIter->pLeaf)==0 ){
+        iPgidx = (u32)pIter->pLeaf->szLeaf;
+        iPgidx += fts5GetVarint32(&pIter->pLeaf->p[iPgidx], iOff);
+        if( iOff<4 || (i64)iOff>=pIter->pLeaf->szLeaf ){
+          p->rc = FTS5_CORRUPT;
+          return;
+        }else{
+          nKeep = 0;
+          iTermOff = iOff;
+          n = (u32)pIter->pLeaf->nn;
+          iOff += fts5GetVarint32(&a[iOff], nNew);
+          break;
+        }
+      }
+    }while( 1 );
+  }
+
+ search_success:
+  if( (i64)iOff+nNew>n || nNew<1 ){
+    p->rc = FTS5_CORRUPT;
+    return;
+  }
+  pIter->iLeafOffset = iOff + nNew;
+  pIter->iTermLeafOffset = pIter->iLeafOffset;
+  pIter->iTermLeafPgno = pIter->iLeafPgno;
+
+  fts5BufferSet(&p->rc, &pIter->term, nKeep, pTerm);
+  fts5BufferAppendBlob(&p->rc, &pIter->term, nNew, &a[iOff]);
+
+  if( iPgidx>=n ){
+    pIter->iEndofDoclist = pIter->pLeaf->nn+1;
+  }else{
+    int nExtra;
+    iPgidx += fts5GetVarint32(&a[iPgidx], nExtra);
+    pIter->iEndofDoclist = iTermOff + nExtra;
+  }
+  pIter->iPgidxOff = iPgidx;
+
+  fts5SegIterLoadRowid(p, pIter);
+  fts5SegIterLoadNPos(p, pIter);
+}
+
+static sqlite3_stmt *fts5IdxSelectStmt(Fts5Index *p){
+  if( p->pIdxSelect==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pIdxSelect, sqlite3_mprintf(
+          "SELECT pgno FROM '%q'.'%q_idx' WHERE "
+          "segid=? AND term<=? ORDER BY term DESC LIMIT 1",
+          pConfig->zDb, pConfig->zName
+    ));
+  }
+  return p->pIdxSelect;
+}
+
+/*
+** Initialize the object pIter to point to term pTerm/nTerm within segment
+** pSeg. If there is no such term in the index, the iterator is set to EOF.
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. If 
+** an error has already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterSeekInit(
+  Fts5Index *p,                   /* FTS5 backend */
+  const u8 *pTerm, int nTerm,     /* Term to seek to */
+  int flags,                      /* Mask of FTS5INDEX_XXX flags */
+  Fts5StructureSegment *pSeg,     /* Description of segment */
+  Fts5SegIter *pIter              /* Object to populate */
+){
+  int iPg = 1;
+  int bGe = (flags & FTS5INDEX_QUERY_SCAN);
+  int bDlidx = 0;                 /* True if there is a doclist-index */
+  sqlite3_stmt *pIdxSelect = 0;
+
+  assert( bGe==0 || (flags & FTS5INDEX_QUERY_DESC)==0 );
+  assert( pTerm && nTerm );
+  memset(pIter, 0, sizeof(*pIter));
+  pIter->pSeg = pSeg;
+
+  /* This block sets stack variable iPg to the leaf page number that may
+  ** contain term (pTerm/nTerm), if it is present in the segment. */
+  pIdxSelect = fts5IdxSelectStmt(p);
+  if( p->rc ) return;
+  sqlite3_bind_int(pIdxSelect, 1, pSeg->iSegid);
+  sqlite3_bind_blob(pIdxSelect, 2, pTerm, nTerm, SQLITE_STATIC);
+  if( SQLITE_ROW==sqlite3_step(pIdxSelect) ){
+    i64 val = sqlite3_column_int(pIdxSelect, 0);
+    iPg = (int)(val>>1);
+    bDlidx = (val & 0x0001);
+  }
+  p->rc = sqlite3_reset(pIdxSelect);
+  sqlite3_bind_null(pIdxSelect, 2);
+
+  if( iPg<pSeg->pgnoFirst ){
+    iPg = pSeg->pgnoFirst;
+    bDlidx = 0;
+  }
+
+  pIter->iLeafPgno = iPg - 1;
+  fts5SegIterNextPage(p, pIter);
+
+  if( pIter->pLeaf ){
+    fts5LeafSeek(p, bGe, pIter, pTerm, nTerm);
+  }
+
+  if( p->rc==SQLITE_OK && (bGe==0 || (flags & FTS5INDEX_QUERY_SCANONETERM)) ){
+    pIter->flags |= FTS5_SEGITER_ONETERM;
+    if( pIter->pLeaf ){
+      if( flags & FTS5INDEX_QUERY_DESC ){
+        pIter->flags |= FTS5_SEGITER_REVERSE;
+      }
+      if( bDlidx ){
+        fts5SegIterLoadDlidx(p, pIter);
+      }
+      if( flags & FTS5INDEX_QUERY_DESC ){
+        fts5SegIterReverse(p, pIter);
+      }
+    }
+  }
+
+  fts5SegIterSetNext(p, pIter);
+  if( 0==(flags & FTS5INDEX_QUERY_SCANONETERM) ){
+    fts5SegIterAllocTombstone(p, pIter);
+  }
+
+  /* Either:
+  **
+  **   1) an error has occurred, or
+  **   2) the iterator points to EOF, or
+  **   3) the iterator points to an entry with term (pTerm/nTerm), or
+  **   4) the FTS5INDEX_QUERY_SCAN flag was set and the iterator points
+  **      to an entry with a term greater than or equal to (pTerm/nTerm).
+  */
+  assert_nc( p->rc!=SQLITE_OK                                       /* 1 */
+   || pIter->pLeaf==0                                               /* 2 */
+   || fts5BufferCompareBlob(&pIter->term, pTerm, nTerm)==0          /* 3 */
+   || (bGe && fts5BufferCompareBlob(&pIter->term, pTerm, nTerm)>0)  /* 4 */
+  );
+}
+
+
+/*
+** SQL used by fts5SegIterNextInit() to find the page to open.
+*/
+static sqlite3_stmt *fts5IdxNextStmt(Fts5Index *p){
+  if( p->pIdxNextSelect==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pIdxNextSelect, sqlite3_mprintf(
+          "SELECT pgno FROM '%q'.'%q_idx' WHERE "
+          "segid=? AND term>? ORDER BY term ASC LIMIT 1",
+          pConfig->zDb, pConfig->zName
+    ));
+    
+  }
+  return p->pIdxNextSelect;
+}
+
+/*
+** This is similar to fts5SegIterSeekInit(), except that it initializes
+** the segment iterator to point to the first term following the page
+** with pToken/nToken on it.
+*/
+static void fts5SegIterNextInit(
+  Fts5Index *p, 
+  const char *pTerm, int nTerm,
+  Fts5StructureSegment *pSeg,     /* Description of segment */
+  Fts5SegIter *pIter              /* Object to populate */
+){
+  int iPg = -1;                   /* Page of segment to open */
+  int bDlidx = 0;
+  sqlite3_stmt *pSel = 0;         /* SELECT to find iPg */
+
+  pSel = fts5IdxNextStmt(p);
+  if( pSel ){
+    assert( p->rc==SQLITE_OK );
+    sqlite3_bind_int(pSel, 1, pSeg->iSegid);
+    sqlite3_bind_blob(pSel, 2, pTerm, nTerm, SQLITE_STATIC);
+
+    if( sqlite3_step(pSel)==SQLITE_ROW ){
+      i64 val = sqlite3_column_int64(pSel, 0);
+      iPg = (int)(val>>1);
+      bDlidx = (val & 0x0001);
+    }
+    p->rc = sqlite3_reset(pSel);
+    sqlite3_bind_null(pSel, 2);
+    if( p->rc ) return;
+  }
+
+  memset(pIter, 0, sizeof(*pIter));
+  pIter->pSeg = pSeg;
+  pIter->flags |= FTS5_SEGITER_ONETERM;
+  if( iPg>=0 ){
+    pIter->iLeafPgno = iPg - 1;
+    fts5SegIterNextPage(p, pIter);
+    fts5SegIterSetNext(p, pIter);
+  }
+  if( pIter->pLeaf ){
+    const u8 *a = pIter->pLeaf->p;
+    int iTermOff = 0;
+
+    pIter->iPgidxOff = pIter->pLeaf->szLeaf;
+    pIter->iPgidxOff += fts5GetVarint32(&a[pIter->iPgidxOff], iTermOff);
+    pIter->iLeafOffset = iTermOff;
+    fts5SegIterLoadTerm(p, pIter, 0);
+    fts5SegIterLoadNPos(p, pIter);
+    if( bDlidx ) fts5SegIterLoadDlidx(p, pIter);
+
+    assert( p->rc!=SQLITE_OK || 
+        fts5BufferCompareBlob(&pIter->term, (const u8*)pTerm, nTerm)>0
+    );
+  }
+}
+
+/*
+** Initialize the object pIter to point to term pTerm/nTerm within the
+** in-memory hash table. If there is no such term in the hash-table, the 
+** iterator is set to EOF.
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. If 
+** an error has already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterHashInit(
+  Fts5Index *p,                   /* FTS5 backend */
+  const u8 *pTerm, int nTerm,     /* Term to seek to */
+  int flags,                      /* Mask of FTS5INDEX_XXX flags */
+  Fts5SegIter *pIter              /* Object to populate */
+){
+  int nList = 0;
+  const u8 *z = 0;
+  int n = 0;
+  Fts5Data *pLeaf = 0;
+
+  assert( p->pHash );
+  assert( p->rc==SQLITE_OK );
+
+  if( pTerm==0 || (flags & FTS5INDEX_QUERY_SCAN) ){
+    const u8 *pList = 0;
+
+    p->rc = sqlite3Fts5HashScanInit(p->pHash, (const char*)pTerm, nTerm);
+    sqlite3Fts5HashScanEntry(p->pHash, (const char**)&z, &n, &pList, &nList);
+    if( pList ){
+      pLeaf = fts5IdxMalloc(p, sizeof(Fts5Data));
+      if( pLeaf ){
+        pLeaf->p = (u8*)pList;
+      }
+    }
+
+    /* The call to sqlite3Fts5HashScanInit() causes the hash table to
+    ** fill the size field of all existing position lists. This means they
+    ** can no longer be appended to. Since the only scenario in which they
+    ** can be appended to is if the previous operation on this table was
+    ** a DELETE, by clearing the Fts5Index.bDelete flag we can avoid this
+    ** possibility altogether.  */
+    p->bDelete = 0;
+  }else{
+    p->rc = sqlite3Fts5HashQuery(p->pHash, sizeof(Fts5Data), 
+        (const char*)pTerm, nTerm, (void**)&pLeaf, &nList
+    );
+    if( pLeaf ){
+      pLeaf->p = (u8*)&pLeaf[1];
+    }
+    z = pTerm;
+    n = nTerm;
+    pIter->flags |= FTS5_SEGITER_ONETERM;
+  }
+
+  if( pLeaf ){
+    sqlite3Fts5BufferSet(&p->rc, &pIter->term, n, z);
+    pLeaf->nn = pLeaf->szLeaf = nList;
+    pIter->pLeaf = pLeaf;
+    pIter->iLeafOffset = fts5GetVarint(pLeaf->p, (u64*)&pIter->iRowid);
+    pIter->iEndofDoclist = pLeaf->nn;
+
+    if( flags & FTS5INDEX_QUERY_DESC ){
+      pIter->flags |= FTS5_SEGITER_REVERSE;
+      fts5SegIterReverseInitPage(p, pIter);
+    }else{
+      fts5SegIterLoadNPos(p, pIter);
+    }
+  }
+
+  fts5SegIterSetNext(p, pIter);
+}
+
+/*
+** Array ap[] contains n elements. Release each of these elements using
+** fts5DataRelease(). Then free the array itself using sqlite3_free().
+*/
+static void fts5IndexFreeArray(Fts5Data **ap, int n){
+  if( ap ){
+    int ii;
+    for(ii=0; ii<n; ii++){
+      fts5DataRelease(ap[ii]);
+    }
+    sqlite3_free(ap);
+  }
+}
+
+/*
+** Decrement the ref-count of the object passed as the only argument. If it
+** reaches 0, free it and its contents. 
+*/
+static void fts5TombstoneArrayDelete(Fts5TombstoneArray *p){
+  if( p ){
+    p->nRef--;
+    if( p->nRef<=0 ){
+      int ii;
+      for(ii=0; ii<p->nTombstone; ii++){
+        fts5DataRelease(p->apTombstone[ii]);
+      }
+      sqlite3_free(p);
+    }
+  }
+}
+
+/*
+** Zero the iterator passed as the only argument.
+*/
+static void fts5SegIterClear(Fts5SegIter *pIter){
+  fts5BufferFree(&pIter->term);
+  fts5DataRelease(pIter->pLeaf);
+  fts5DataRelease(pIter->pNextLeaf);
+  fts5TombstoneArrayDelete(pIter->pTombArray);
+  fts5DlidxIterFree(pIter->pDlidx);
+  sqlite3_free(pIter->aRowidOffset);
+  memset(pIter, 0, sizeof(Fts5SegIter));
+}
+
+#ifdef SQLITE_DEBUG
+
+/*
+** This function is used as part of the big assert() procedure implemented by
+** fts5AssertMultiIterSetup(). It ensures that the result currently stored
+** in *pRes is the correct result of comparing the current positions of the
+** two iterators.
+*/
+static void fts5AssertComparisonResult(
+  Fts5Iter *pIter, 
+  Fts5SegIter *p1,
+  Fts5SegIter *p2,
+  Fts5CResult *pRes
+){
+  int i1 = p1 - pIter->aSeg;
+  int i2 = p2 - pIter->aSeg;
+
+  if( p1->pLeaf || p2->pLeaf ){
+    if( p1->pLeaf==0 ){
+      assert( pRes->iFirst==i2 );
+    }else if( p2->pLeaf==0 ){
+      assert( pRes->iFirst==i1 );
+    }else{
+      int nMin = MIN(p1->term.n, p2->term.n);
+      int res = fts5Memcmp(p1->term.p, p2->term.p, nMin);
+      if( res==0 ) res = p1->term.n - p2->term.n;
+
+      if( res==0 ){
+        assert( pRes->bTermEq==1 );
+        assert( p1->iRowid!=p2->iRowid );
+        res = ((p1->iRowid > p2->iRowid)==pIter->bRev) ? -1 : 1;
+      }else{
+        assert( pRes->bTermEq==0 );
+      }
+
+      if( res<0 ){
+        assert( pRes->iFirst==i1 );
+      }else{
+        assert( pRes->iFirst==i2 );
+      }
+    }
+  }
+}
+
+/*
+** This function is a no-op unless SQLITE_DEBUG is defined when this module
+** is compiled. In that case, this function is essentially an assert() 
+** statement used to verify that the contents of the pIter->aFirst[] array
+** are correct.
+*/
+static void fts5AssertMultiIterSetup(Fts5Index *p, Fts5Iter *pIter){
+  if( p->rc==SQLITE_OK ){
+    Fts5SegIter *pFirst = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+    int i;
+
+    assert( (pFirst->pLeaf==0)==pIter->base.bEof );
+
+    /* Check that pIter->iSwitchRowid is set correctly. */
+    for(i=0; i<pIter->nSeg; i++){
+      Fts5SegIter *p1 = &pIter->aSeg[i];
+      assert( p1==pFirst 
+           || p1->pLeaf==0 
+           || fts5BufferCompare(&pFirst->term, &p1->term) 
+           || p1->iRowid==pIter->iSwitchRowid
+           || (p1->iRowid<pIter->iSwitchRowid)==pIter->bRev
+      );
+    }
+
+    for(i=0; i<pIter->nSeg; i+=2){
+      Fts5SegIter *p1 = &pIter->aSeg[i];
+      Fts5SegIter *p2 = &pIter->aSeg[i+1];
+      Fts5CResult *pRes = &pIter->aFirst[(pIter->nSeg + i) / 2];
+      fts5AssertComparisonResult(pIter, p1, p2, pRes);
+    }
+
+    for(i=1; i<(pIter->nSeg / 2); i+=2){
+      Fts5SegIter *p1 = &pIter->aSeg[ pIter->aFirst[i*2].iFirst ];
+      Fts5SegIter *p2 = &pIter->aSeg[ pIter->aFirst[i*2+1].iFirst ];
+      Fts5CResult *pRes = &pIter->aFirst[i];
+      fts5AssertComparisonResult(pIter, p1, p2, pRes);
+    }
+  }
+}
+#else
+# define fts5AssertMultiIterSetup(x,y)
+#endif
+
+/*
+** Do the comparison necessary to populate pIter->aFirst[iOut].
+**
+** If the returned value is non-zero, then it is the index of an entry
+** in the pIter->aSeg[] array that is (a) not at EOF, and (b) pointing
+** to a key that is a duplicate of another, higher priority, 
+** segment-iterator in the pSeg->aSeg[] array.
+*/
+static int fts5MultiIterDoCompare(Fts5Iter *pIter, int iOut){
+  int i1;                         /* Index of left-hand Fts5SegIter */
+  int i2;                         /* Index of right-hand Fts5SegIter */
+  int iRes;
+  Fts5SegIter *p1;                /* Left-hand Fts5SegIter */
+  Fts5SegIter *p2;                /* Right-hand Fts5SegIter */
+  Fts5CResult *pRes = &pIter->aFirst[iOut];
+
+  assert( iOut<pIter->nSeg && iOut>0 );
+  assert( pIter->bRev==0 || pIter->bRev==1 );
+
+  if( iOut>=(pIter->nSeg/2) ){
+    i1 = (iOut - pIter->nSeg/2) * 2;
+    i2 = i1 + 1;
+  }else{
+    i1 = pIter->aFirst[iOut*2].iFirst;
+    i2 = pIter->aFirst[iOut*2+1].iFirst;
+  }
+  p1 = &pIter->aSeg[i1];
+  p2 = &pIter->aSeg[i2];
+
+  pRes->bTermEq = 0;
+  if( p1->pLeaf==0 ){           /* If p1 is at EOF */
+    iRes = i2;
+  }else if( p2->pLeaf==0 ){     /* If p2 is at EOF */
+    iRes = i1;
+  }else{
+    int res = fts5BufferCompare(&p1->term, &p2->term);
+    if( res==0 ){
+      assert_nc( i2>i1 );
+      assert_nc( i2!=0 );
+      pRes->bTermEq = 1;
+      if( p1->iRowid==p2->iRowid ){
+        return i2;
+      }
+      res = ((p1->iRowid > p2->iRowid)==pIter->bRev) ? -1 : +1;
+    }
+    assert( res!=0 );
+    if( res<0 ){
+      iRes = i1;
+    }else{
+      iRes = i2;
+    }
+  }
+
+  pRes->iFirst = (u16)iRes;
+  return 0;
+}
+
+/*
+** Move the seg-iter so that it points to the first rowid on page iLeafPgno.
+** It is an error if leaf iLeafPgno does not exist. Unless the db is
+** a 'secure-delete' db, if it contains no rowids then this is also an error.
+*/
+static void fts5SegIterGotoPage(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int iLeafPgno
+){
+  assert( iLeafPgno>pIter->iLeafPgno );
+
+  if( iLeafPgno>pIter->pSeg->pgnoLast ){
+    p->rc = FTS5_CORRUPT;
+  }else{
+    fts5DataRelease(pIter->pNextLeaf);
+    pIter->pNextLeaf = 0;
+    pIter->iLeafPgno = iLeafPgno-1;
+
+    while( p->rc==SQLITE_OK ){
+      int iOff;
+      fts5SegIterNextPage(p, pIter);
+      if( pIter->pLeaf==0 ) break;
+      iOff = fts5LeafFirstRowidOff(pIter->pLeaf);
+      if( iOff>0 ){
+        u8 *a = pIter->pLeaf->p;
+        int n = pIter->pLeaf->szLeaf;
+        if( iOff<4 || iOff>=n ){
+          p->rc = FTS5_CORRUPT;
+        }else{
+          iOff += fts5GetVarint(&a[iOff], (u64*)&pIter->iRowid);
+          pIter->iLeafOffset = iOff;
+          fts5SegIterLoadNPos(p, pIter);
+        }
+        break;
+      }
+    }
+  }
+}
+
+/*
+** Advance the iterator passed as the second argument until it is at or 
+** past rowid iFrom. Regardless of the value of iFrom, the iterator is
+** always advanced at least once.
+*/
+static void fts5SegIterNextFrom(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  i64 iMatch                      /* Advance iterator at least this far */
+){
+  int bRev = (pIter->flags & FTS5_SEGITER_REVERSE);
+  Fts5DlidxIter *pDlidx = pIter->pDlidx;
+  int iLeafPgno = pIter->iLeafPgno;
+  int bMove = 1;
+
+  assert( pIter->flags & FTS5_SEGITER_ONETERM );
+  assert( pIter->pDlidx );
+  assert( pIter->pLeaf );
+
+  if( bRev==0 ){
+    while( !fts5DlidxIterEof(p, pDlidx) && iMatch>fts5DlidxIterRowid(pDlidx) ){
+      iLeafPgno = fts5DlidxIterPgno(pDlidx);
+      fts5DlidxIterNext(p, pDlidx);
+    }
+    assert_nc( iLeafPgno>=pIter->iLeafPgno || p->rc );
+    if( iLeafPgno>pIter->iLeafPgno ){
+      fts5SegIterGotoPage(p, pIter, iLeafPgno);
+      bMove = 0;
+    }
+  }else{
+    assert( pIter->pNextLeaf==0 );
+    assert( iMatch<pIter->iRowid );
+    while( !fts5DlidxIterEof(p, pDlidx) && iMatch<fts5DlidxIterRowid(pDlidx) ){
+      fts5DlidxIterPrev(p, pDlidx);
+    }
+    iLeafPgno = fts5DlidxIterPgno(pDlidx);
+
+    assert( fts5DlidxIterEof(p, pDlidx) || iLeafPgno<=pIter->iLeafPgno );
+
+    if( iLeafPgno<pIter->iLeafPgno ){
+      pIter->iLeafPgno = iLeafPgno+1;
+      fts5SegIterReverseNewPage(p, pIter);
+      bMove = 0;
+    }
+  }
+
+  do{
+    if( bMove && p->rc==SQLITE_OK ) pIter->xNext(p, pIter, 0);
+    if( pIter->pLeaf==0 ) break;
+    if( bRev==0 && pIter->iRowid>=iMatch ) break;
+    if( bRev!=0 && pIter->iRowid<=iMatch ) break;
+    bMove = 1;
+  }while( p->rc==SQLITE_OK );
+}
+
+/*
+** Free the iterator object passed as the second argument.
+*/
+static void fts5MultiIterFree(Fts5Iter *pIter){
+  if( pIter ){
+    int i;
+    for(i=0; i<pIter->nSeg; i++){
+      fts5SegIterClear(&pIter->aSeg[i]);
+    }
+    fts5BufferFree(&pIter->poslist);
+    sqlite3_free(pIter);
+  }
+}
+
+static void fts5MultiIterAdvanced(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  Fts5Iter *pIter,                /* Iterator to update aFirst[] array for */
+  int iChanged,                   /* Index of sub-iterator just advanced */
+  int iMinset                     /* Minimum entry in aFirst[] to set */
+){
+  int i;
+  for(i=(pIter->nSeg+iChanged)/2; i>=iMinset && p->rc==SQLITE_OK; i=i/2){
+    int iEq;
+    if( (iEq = fts5MultiIterDoCompare(pIter, i)) ){
+      Fts5SegIter *pSeg = &pIter->aSeg[iEq];
+      assert( p->rc==SQLITE_OK );
+      pSeg->xNext(p, pSeg, 0);
+      i = pIter->nSeg + iEq;
+    }
+  }
+}
+
+/*
+** Sub-iterator iChanged of iterator pIter has just been advanced. It still
+** points to the same term though - just a different rowid. This function
+** attempts to update the contents of the pIter->aFirst[] accordingly.
+** If it does so successfully, 0 is returned. Otherwise 1.
+**
+** If non-zero is returned, the caller should call fts5MultiIterAdvanced()
+** on the iterator instead. That function does the same as this one, except
+** that it deals with more complicated cases as well.
+*/ 
+static int fts5MultiIterAdvanceRowid(
+  Fts5Iter *pIter,                /* Iterator to update aFirst[] array for */
+  int iChanged,                   /* Index of sub-iterator just advanced */
+  Fts5SegIter **ppFirst
+){
+  Fts5SegIter *pNew = &pIter->aSeg[iChanged];
+
+  if( pNew->iRowid==pIter->iSwitchRowid
+   || (pNew->iRowid<pIter->iSwitchRowid)==pIter->bRev
+  ){
+    int i;
+    Fts5SegIter *pOther = &pIter->aSeg[iChanged ^ 0x0001];
+    pIter->iSwitchRowid = pIter->bRev ? SMALLEST_INT64 : LARGEST_INT64;
+    for(i=(pIter->nSeg+iChanged)/2; 1; i=i/2){
+      Fts5CResult *pRes = &pIter->aFirst[i];
+
+      assert( pNew->pLeaf );
+      assert( pRes->bTermEq==0 || pOther->pLeaf );
+
+      if( pRes->bTermEq ){
+        if( pNew->iRowid==pOther->iRowid ){
+          return 1;
+        }else if( (pOther->iRowid>pNew->iRowid)==pIter->bRev ){
+          pIter->iSwitchRowid = pOther->iRowid;
+          pNew = pOther;
+        }else if( (pOther->iRowid>pIter->iSwitchRowid)==pIter->bRev ){
+          pIter->iSwitchRowid = pOther->iRowid;
+        }
+      }
+      pRes->iFirst = (u16)(pNew - pIter->aSeg);
+      if( i==1 ) break;
+
+      pOther = &pIter->aSeg[ pIter->aFirst[i ^ 0x0001].iFirst ];
+    }
+  }
+
+  *ppFirst = pNew;
+  return 0;
+}
+
+/*
+** Set the pIter->bEof variable based on the state of the sub-iterators.
+*/
+static void fts5MultiIterSetEof(Fts5Iter *pIter){
+  Fts5SegIter *pSeg = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+  pIter->base.bEof = pSeg->pLeaf==0;
+  pIter->iSwitchRowid = pSeg->iRowid;
+}
+
+/*
+** The argument to this macro must be an Fts5Data structure containing a
+** tombstone hash page. This macro returns the key-size of the hash-page.
+*/
+#define TOMBSTONE_KEYSIZE(pPg) (pPg->p[0]==4 ? 4 : 8)
+
+#define TOMBSTONE_NSLOT(pPg)   \
+  ((pPg->nn > 16) ? ((pPg->nn-8) / TOMBSTONE_KEYSIZE(pPg)) : 1)
+
+/*
+** Query a single tombstone hash table for rowid iRowid. Return true if
+** it is found or false otherwise. The tombstone hash table is one of
+** nHashTable tables.
+*/
+static int fts5IndexTombstoneQuery(
+  Fts5Data *pHash,                /* Hash table page to query */
+  int nHashTable,                 /* Number of pages attached to segment */
+  u64 iRowid                      /* Rowid to query hash for */
+){
+  const int szKey = TOMBSTONE_KEYSIZE(pHash);
+  const int nSlot = TOMBSTONE_NSLOT(pHash);
+  int iSlot = (iRowid / nHashTable) % nSlot;
+  int nCollide = nSlot;
+
+  if( iRowid==0 ){
+    return pHash->p[1];
+  }else if( szKey==4 ){
+    u32 *aSlot = (u32*)&pHash->p[8];
+    while( aSlot[iSlot] ){
+      if( fts5GetU32((u8*)&aSlot[iSlot])==iRowid ) return 1;
+      if( nCollide--==0 ) break;
+      iSlot = (iSlot+1)%nSlot;
+    }
+  }else{
+    u64 *aSlot = (u64*)&pHash->p[8];
+    while( aSlot[iSlot] ){
+      if( fts5GetU64((u8*)&aSlot[iSlot])==iRowid ) return 1;
+      if( nCollide--==0 ) break;
+      iSlot = (iSlot+1)%nSlot;
+    }
+  }
+
+  return 0;
+}
+
+/*
+** Return true if the iterator passed as the only argument points
+** to an segment entry for which there is a tombstone. Return false
+** if there is no tombstone or if the iterator is already at EOF.
+*/
+static int fts5MultiIterIsDeleted(Fts5Iter *pIter){
+  int iFirst = pIter->aFirst[1].iFirst;
+  Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
+  Fts5TombstoneArray *pArray = pSeg->pTombArray;
+
+  if( pSeg->pLeaf && pArray ){
+    /* Figure out which page the rowid might be present on. */
+    int iPg = ((u64)pSeg->iRowid) % pArray->nTombstone;
+    assert( iPg>=0 );
+
+    /* If tombstone hash page iPg has not yet been loaded from the 
+    ** database, load it now. */
+    if( pArray->apTombstone[iPg]==0 ){
+      pArray->apTombstone[iPg] = fts5DataRead(pIter->pIndex,
+          FTS5_TOMBSTONE_ROWID(pSeg->pSeg->iSegid, iPg)
+      );
+      if( pArray->apTombstone[iPg]==0 ) return 0;
+    }
+
+    return fts5IndexTombstoneQuery(
+        pArray->apTombstone[iPg],
+        pArray->nTombstone,
+        pSeg->iRowid
+    );
+  }
+
+  return 0;
+}
+
+/*
+** Move the iterator to the next entry. 
+**
+** If an error occurs, an error code is left in Fts5Index.rc. It is not 
+** considered an error if the iterator reaches EOF, or if it is already at 
+** EOF when this function is called.
+*/
+static void fts5MultiIterNext(
+  Fts5Index *p, 
+  Fts5Iter *pIter,
+  int bFrom,                      /* True if argument iFrom is valid */
+  i64 iFrom                       /* Advance at least as far as this */
+){
+  int bUseFrom = bFrom;
+  assert( pIter->base.bEof==0 );
+  while( p->rc==SQLITE_OK ){
+    int iFirst = pIter->aFirst[1].iFirst;
+    int bNewTerm = 0;
+    Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
+    assert( p->rc==SQLITE_OK );
+    if( bUseFrom && pSeg->pDlidx ){
+      fts5SegIterNextFrom(p, pSeg, iFrom);
+    }else{
+      pSeg->xNext(p, pSeg, &bNewTerm);
+    }
+
+    if( pSeg->pLeaf==0 || bNewTerm 
+     || fts5MultiIterAdvanceRowid(pIter, iFirst, &pSeg)
+    ){
+      fts5MultiIterAdvanced(p, pIter, iFirst, 1);
+      fts5MultiIterSetEof(pIter);
+      pSeg = &pIter->aSeg[pIter->aFirst[1].iFirst];
+      if( pSeg->pLeaf==0 ) return;
+    }
+
+    fts5AssertMultiIterSetup(p, pIter);
+    assert( pSeg==&pIter->aSeg[pIter->aFirst[1].iFirst] && pSeg->pLeaf );
+    if( (pIter->bSkipEmpty==0 || pSeg->nPos) 
+      && 0==fts5MultiIterIsDeleted(pIter)
+    ){
+      pIter->xSetOutputs(pIter, pSeg);
+      return;
+    }
+    bUseFrom = 0;
+  }
+}
+
+static void fts5MultiIterNext2(
+  Fts5Index *p, 
+  Fts5Iter *pIter,
+  int *pbNewTerm                  /* OUT: True if *might* be new term */
+){
+  assert( pIter->bSkipEmpty );
+  if( p->rc==SQLITE_OK ){
+    *pbNewTerm = 0;
+    do{
+      int iFirst = pIter->aFirst[1].iFirst;
+      Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
+      int bNewTerm = 0;
+
+      assert( p->rc==SQLITE_OK );
+      pSeg->xNext(p, pSeg, &bNewTerm);
+      if( pSeg->pLeaf==0 || bNewTerm 
+       || fts5MultiIterAdvanceRowid(pIter, iFirst, &pSeg)
+      ){
+        fts5MultiIterAdvanced(p, pIter, iFirst, 1);
+        fts5MultiIterSetEof(pIter);
+        *pbNewTerm = 1;
+      }
+      fts5AssertMultiIterSetup(p, pIter);
+
+    }while( (fts5MultiIterIsEmpty(p, pIter) || fts5MultiIterIsDeleted(pIter)) 
+         && (p->rc==SQLITE_OK)
+    );
+  }
+}
+
+static void fts5IterSetOutputs_Noop(Fts5Iter *pUnused1, Fts5SegIter *pUnused2){
+  UNUSED_PARAM2(pUnused1, pUnused2);
+}
+
+static Fts5Iter *fts5MultiIterAlloc(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  int nSeg
+){
+  Fts5Iter *pNew;
+  i64 nSlot;                      /* Power of two >= nSeg */
+
+  for(nSlot=2; nSlot<nSeg; nSlot=nSlot*2);
+  pNew = fts5IdxMalloc(p, 
+      sizeof(Fts5Iter) +                  /* pNew */
+      sizeof(Fts5SegIter) * (nSlot-1) +   /* pNew->aSeg[] */
+      sizeof(Fts5CResult) * nSlot         /* pNew->aFirst[] */
+  );
+  if( pNew ){
+    pNew->nSeg = nSlot;
+    pNew->aFirst = (Fts5CResult*)&pNew->aSeg[nSlot];
+    pNew->pIndex = p;
+    pNew->xSetOutputs = fts5IterSetOutputs_Noop;
+  }
+  return pNew;
+}
+
+static void fts5PoslistCallback(
+  Fts5Index *pUnused, 
+  void *pContext, 
+  const u8 *pChunk, int nChunk
+){
+  UNUSED_PARAM(pUnused);
+  assert_nc( nChunk>=0 );
+  if( nChunk>0 ){
+    fts5BufferSafeAppendBlob((Fts5Buffer*)pContext, pChunk, nChunk);
+  }
+}
+
+typedef struct PoslistCallbackCtx PoslistCallbackCtx;
+struct PoslistCallbackCtx {
+  Fts5Buffer *pBuf;               /* Append to this buffer */
+  Fts5Colset *pColset;            /* Restrict matches to this column */
+  int eState;                     /* See above */
+};
+
+typedef struct PoslistOffsetsCtx PoslistOffsetsCtx;
+struct PoslistOffsetsCtx {
+  Fts5Buffer *pBuf;               /* Append to this buffer */
+  Fts5Colset *pColset;            /* Restrict matches to this column */
+  int iRead;
+  int iWrite;
+};
+
+/*
+** TODO: Make this more efficient!
+*/
+static int fts5IndexColsetTest(Fts5Colset *pColset, int iCol){
+  int i;
+  for(i=0; i<pColset->nCol; i++){
+    if( pColset->aiCol[i]==iCol ) return 1;
+  }
+  return 0;
+}
+
+static void fts5PoslistOffsetsCallback(
+  Fts5Index *pUnused, 
+  void *pContext, 
+  const u8 *pChunk, int nChunk
+){
+  PoslistOffsetsCtx *pCtx = (PoslistOffsetsCtx*)pContext;
+  UNUSED_PARAM(pUnused);
+  assert_nc( nChunk>=0 );
+  if( nChunk>0 ){
+    int i = 0;
+    while( i<nChunk ){
+      int iVal;
+      i += fts5GetVarint32(&pChunk[i], iVal);
+      iVal += pCtx->iRead - 2;
+      pCtx->iRead = iVal;
+      if( fts5IndexColsetTest(pCtx->pColset, iVal) ){
+        fts5BufferSafeAppendVarint(pCtx->pBuf, iVal + 2 - pCtx->iWrite);
+        pCtx->iWrite = iVal;
+      }
+    }
+  }
+}
+
+static void fts5PoslistFilterCallback(
+  Fts5Index *pUnused,
+  void *pContext, 
+  const u8 *pChunk, int nChunk
+){
+  PoslistCallbackCtx *pCtx = (PoslistCallbackCtx*)pContext;
+  UNUSED_PARAM(pUnused);
+  assert_nc( nChunk>=0 );
+  if( nChunk>0 ){
+    /* Search through to find the first varint with value 1. This is the
+    ** start of the next columns hits. */
+    int i = 0;
+    int iStart = 0;
+
+    if( pCtx->eState==2 ){
+      int iCol;
+      fts5FastGetVarint32(pChunk, i, iCol);
+      if( fts5IndexColsetTest(pCtx->pColset, iCol) ){
+        pCtx->eState = 1;
+        fts5BufferSafeAppendVarint(pCtx->pBuf, 1);
+      }else{
+        pCtx->eState = 0;
+      }
+    }
+
+    do {
+      while( i<nChunk && pChunk[i]!=0x01 ){
+        while( pChunk[i] & 0x80 ) i++;
+        i++;
+      }
+      if( pCtx->eState ){
+        fts5BufferSafeAppendBlob(pCtx->pBuf, &pChunk[iStart], i-iStart);
+      }
+      if( i<nChunk ){
+        int iCol;
+        iStart = i;
+        i++;
+        if( i>=nChunk ){
+          pCtx->eState = 2;
+        }else{
+          fts5FastGetVarint32(pChunk, i, iCol);
+          pCtx->eState = fts5IndexColsetTest(pCtx->pColset, iCol);
+          if( pCtx->eState ){
+            fts5BufferSafeAppendBlob(pCtx->pBuf, &pChunk[iStart], i-iStart);
+            iStart = i;
+          }
+        }
+      }
+    }while( i<nChunk );
+  }
+}
+
+static void fts5ChunkIterate(
+  Fts5Index *p,                   /* Index object */
+  Fts5SegIter *pSeg,              /* Poslist of this iterator */
+  void *pCtx,                     /* Context pointer for xChunk callback */
+  void (*xChunk)(Fts5Index*, void*, const u8*, int)
+){
+  int nRem = pSeg->nPos;          /* Number of bytes still to come */
+  Fts5Data *pData = 0;
+  u8 *pChunk = &pSeg->pLeaf->p[pSeg->iLeafOffset];
+  int nChunk = MIN(nRem, pSeg->pLeaf->szLeaf - pSeg->iLeafOffset);
+  int pgno = pSeg->iLeafPgno;
+  int pgnoSave = 0;
+
+  /* This function does not work with detail=none databases. */
+  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );
+
+  if( (pSeg->flags & FTS5_SEGITER_REVERSE)==0 ){
+    pgnoSave = pgno+1;
+  }
+
+  while( 1 ){
+    xChunk(p, pCtx, pChunk, nChunk);
+    nRem -= nChunk;
+    fts5DataRelease(pData);
+    if( nRem<=0 ){
+      break;
+    }else if( pSeg->pSeg==0 ){
+      p->rc = FTS5_CORRUPT;
+      return;
+    }else{
+      pgno++;
+      pData = fts5LeafRead(p, FTS5_SEGMENT_ROWID(pSeg->pSeg->iSegid, pgno));
+      if( pData==0 ) break;
+      pChunk = &pData->p[4];
+      nChunk = MIN(nRem, pData->szLeaf - 4);
+      if( pgno==pgnoSave ){
+        assert( pSeg->pNextLeaf==0 );
+        pSeg->pNextLeaf = pData;
+        pData = 0;
+      }
+    }
+  }
+}
+
+/*
+** Iterator pIter currently points to a valid entry (not EOF). This
+** function appends the position list data for the current entry to
+** buffer pBuf. It does not make a copy of the position-list size
+** field.
+*/
+static void fts5SegiterPoslist(
+  Fts5Index *p,
+  Fts5SegIter *pSeg,
+  Fts5Colset *pColset,
+  Fts5Buffer *pBuf
+){
+  assert( pBuf!=0 );
+  assert( pSeg!=0 );
+  if( 0==fts5BufferGrow(&p->rc, pBuf, pSeg->nPos+FTS5_DATA_ZERO_PADDING) ){
+    assert( pBuf->p!=0 );
+    assert( pBuf->nSpace >= pBuf->n+pSeg->nPos+FTS5_DATA_ZERO_PADDING );
+    memset(&pBuf->p[pBuf->n+pSeg->nPos], 0, FTS5_DATA_ZERO_PADDING);
+    if( pColset==0 ){
+      fts5ChunkIterate(p, pSeg, (void*)pBuf, fts5PoslistCallback);
+    }else{
+      if( p->pConfig->eDetail==FTS5_DETAIL_FULL ){
+        PoslistCallbackCtx sCtx;
+        sCtx.pBuf = pBuf;
+        sCtx.pColset = pColset;
+        sCtx.eState = fts5IndexColsetTest(pColset, 0);
+        assert( sCtx.eState==0 || sCtx.eState==1 );
+        fts5ChunkIterate(p, pSeg, (void*)&sCtx, fts5PoslistFilterCallback);
+      }else{
+        PoslistOffsetsCtx sCtx;
+        memset(&sCtx, 0, sizeof(sCtx));
+        sCtx.pBuf = pBuf;
+        sCtx.pColset = pColset;
+        fts5ChunkIterate(p, pSeg, (void*)&sCtx, fts5PoslistOffsetsCallback);
+      }
+    }
+  }
+}
+
+/*
+** Parameter pPos points to a buffer containing a position list, size nPos.
+** This function filters it according to pColset (which must be non-NULL)
+** and sets pIter->base.pData/nData to point to the new position list.
+** If memory is required for the new position list, use buffer pIter->poslist.
+** Or, if the new position list is a contiguous subset of the input, set
+** pIter->base.pData/nData to point directly to it.
+**
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. If an OOM error is encountered, *pRc is set to SQLITE_NOMEM
+** before returning.
+*/
+static void fts5IndexExtractColset(
+  int *pRc,
+  Fts5Colset *pColset,            /* Colset to filter on */
+  const u8 *pPos, int nPos,       /* Position list */
+  Fts5Iter *pIter
+){
+  if( *pRc==SQLITE_OK ){
+    const u8 *p = pPos;
+    const u8 *aCopy = p;
+    const u8 *pEnd = &p[nPos];    /* One byte past end of position list */
+    int i = 0;
+    int iCurrent = 0;
+
+    if( pColset->nCol>1 && sqlite3Fts5BufferSize(pRc, &pIter->poslist, nPos) ){
+      return;
+    }
+
+    while( 1 ){
+      while( pColset->aiCol[i]<iCurrent ){
+        i++;
+        if( i==pColset->nCol ){
+          pIter->base.pData = pIter->poslist.p;
+          pIter->base.nData = pIter->poslist.n;
+          return;
+        }
+      }
+
+      /* Advance pointer p until it points to pEnd or an 0x01 byte that is
+      ** not part of a varint */
+      while( p<pEnd && *p!=0x01 ){
+        while( *p++ & 0x80 );
+      }
+
+      if( pColset->aiCol[i]==iCurrent ){
+        if( pColset->nCol==1 ){
+          pIter->base.pData = aCopy;
+          pIter->base.nData = p-aCopy;
+          return;
+        }
+        fts5BufferSafeAppendBlob(&pIter->poslist, aCopy, p-aCopy);
+      }
+      if( p>=pEnd ){
+        pIter->base.pData = pIter->poslist.p;
+        pIter->base.nData = pIter->poslist.n;
+        return;
+      }
+      aCopy = p++;
+      iCurrent = *p++;
+      if( iCurrent & 0x80 ){
+        p--;
+        p += fts5GetVarint32(p, iCurrent);
+      }
+    }
+  }
+
+}
+
+/*
+** xSetOutputs callback used by detail=none tables.
+*/
+static void fts5IterSetOutputs_None(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  assert( pIter->pIndex->pConfig->eDetail==FTS5_DETAIL_NONE );
+  pIter->base.iRowid = pSeg->iRowid;
+  pIter->base.nData = pSeg->nPos;
+}
+
+/*
+** xSetOutputs callback used by detail=full and detail=col tables when no
+** column filters are specified.
+*/
+static void fts5IterSetOutputs_Nocolset(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  pIter->base.iRowid = pSeg->iRowid;
+  pIter->base.nData = pSeg->nPos;
+
+  assert( pIter->pIndex->pConfig->eDetail!=FTS5_DETAIL_NONE );
+  assert( pIter->pColset==0 );
+
+  if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf ){
+    /* All data is stored on the current page. Populate the output 
+    ** variables to point into the body of the page object. */
+    pIter->base.pData = &pSeg->pLeaf->p[pSeg->iLeafOffset];
+  }else{
+    /* The data is distributed over two or more pages. Copy it into the
+    ** Fts5Iter.poslist buffer and then set the output pointer to point
+    ** to this buffer.  */
+    fts5BufferZero(&pIter->poslist);
+    fts5SegiterPoslist(pIter->pIndex, pSeg, 0, &pIter->poslist);
+    pIter->base.pData = pIter->poslist.p;
+  }
+}
+
+/*
+** xSetOutputs callback used when the Fts5Colset object has nCol==0 (match
+** against no columns at all).
+*/
+static void fts5IterSetOutputs_ZeroColset(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  UNUSED_PARAM(pSeg);
+  pIter->base.nData = 0;
+}
+
+/*
+** xSetOutputs callback used by detail=col when there is a column filter
+** and there are 100 or more columns. Also called as a fallback from
+** fts5IterSetOutputs_Col100 if the column-list spans more than one page.
+*/
+static void fts5IterSetOutputs_Col(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  fts5BufferZero(&pIter->poslist);
+  fts5SegiterPoslist(pIter->pIndex, pSeg, pIter->pColset, &pIter->poslist);
+  pIter->base.iRowid = pSeg->iRowid;
+  pIter->base.pData = pIter->poslist.p;
+  pIter->base.nData = pIter->poslist.n;
+}
+
+/*
+** xSetOutputs callback used when: 
+**
+**   * detail=col,
+**   * there is a column filter, and
+**   * the table contains 100 or fewer columns. 
+**
+** The last point is to ensure all column numbers are stored as 
+** single-byte varints.
+*/
+static void fts5IterSetOutputs_Col100(Fts5Iter *pIter, Fts5SegIter *pSeg){
+
+  assert( pIter->pIndex->pConfig->eDetail==FTS5_DETAIL_COLUMNS );
+  assert( pIter->pColset );
+
+  if( pSeg->iLeafOffset+pSeg->nPos>pSeg->pLeaf->szLeaf ){
+    fts5IterSetOutputs_Col(pIter, pSeg);
+  }else{
+    u8 *a = (u8*)&pSeg->pLeaf->p[pSeg->iLeafOffset];
+    u8 *pEnd = (u8*)&a[pSeg->nPos]; 
+    int iPrev = 0;
+    int *aiCol = pIter->pColset->aiCol;
+    int *aiColEnd = &aiCol[pIter->pColset->nCol];
+
+    u8 *aOut = pIter->poslist.p;
+    int iPrevOut = 0;
+
+    pIter->base.iRowid = pSeg->iRowid;
+
+    while( a<pEnd ){
+      iPrev += (int)a++[0] - 2;
+      while( *aiCol<iPrev ){
+        aiCol++;
+        if( aiCol==aiColEnd ) goto setoutputs_col_out;
+      }
+      if( *aiCol==iPrev ){
+        *aOut++ = (u8)((iPrev - iPrevOut) + 2);
+        iPrevOut = iPrev;
+      }
+    }
+
+setoutputs_col_out:
+    pIter->base.pData = pIter->poslist.p;
+    pIter->base.nData = aOut - pIter->poslist.p;
+  }
+}
+
+/*
+** xSetOutputs callback used by detail=full when there is a column filter.
+*/
+static void fts5IterSetOutputs_Full(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  Fts5Colset *pColset = pIter->pColset;
+  pIter->base.iRowid = pSeg->iRowid;
+
+  assert( pIter->pIndex->pConfig->eDetail==FTS5_DETAIL_FULL );
+  assert( pColset );
+
+  if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf ){
+    /* All data is stored on the current page. Populate the output 
+    ** variables to point into the body of the page object. */
+    const u8 *a = &pSeg->pLeaf->p[pSeg->iLeafOffset];
+    int *pRc = &pIter->pIndex->rc;
+    fts5BufferZero(&pIter->poslist);
+    fts5IndexExtractColset(pRc, pColset, a, pSeg->nPos, pIter);
+  }else{
+    /* The data is distributed over two or more pages. Copy it into the
+    ** Fts5Iter.poslist buffer and then set the output pointer to point
+    ** to this buffer.  */
+    fts5BufferZero(&pIter->poslist);
+    fts5SegiterPoslist(pIter->pIndex, pSeg, pColset, &pIter->poslist);
+    pIter->base.pData = pIter->poslist.p;
+    pIter->base.nData = pIter->poslist.n;
+  }
+}
+
+static void fts5IterSetOutputCb(int *pRc, Fts5Iter *pIter){
+  assert( pIter!=0 || (*pRc)!=SQLITE_OK );
+  if( *pRc==SQLITE_OK ){
+    Fts5Config *pConfig = pIter->pIndex->pConfig;
+    if( pConfig->eDetail==FTS5_DETAIL_NONE ){
+      pIter->xSetOutputs = fts5IterSetOutputs_None;
+    }
+
+    else if( pIter->pColset==0 ){
+      pIter->xSetOutputs = fts5IterSetOutputs_Nocolset;
+    }
+
+    else if( pIter->pColset->nCol==0 ){
+      pIter->xSetOutputs = fts5IterSetOutputs_ZeroColset;
+    }
+
+    else if( pConfig->eDetail==FTS5_DETAIL_FULL ){
+      pIter->xSetOutputs = fts5IterSetOutputs_Full;
+    }
+
+    else{
+      assert( pConfig->eDetail==FTS5_DETAIL_COLUMNS );
+      if( pConfig->nCol<=100 ){
+        pIter->xSetOutputs = fts5IterSetOutputs_Col100;
+        sqlite3Fts5BufferSize(pRc, &pIter->poslist, pConfig->nCol);
+      }else{
+        pIter->xSetOutputs = fts5IterSetOutputs_Col;
+      }
+    }
+  }
+}
+
+/*
+** All the component segment-iterators of pIter have been set up. This
+** functions finishes setup for iterator pIter itself.
+*/
+static void fts5MultiIterFinishSetup(Fts5Index *p, Fts5Iter *pIter){
+  int iIter;
+  for(iIter=pIter->nSeg-1; iIter>0; iIter--){
+    int iEq;
+    if( (iEq = fts5MultiIterDoCompare(pIter, iIter)) ){
+      Fts5SegIter *pSeg = &pIter->aSeg[iEq];
+      if( p->rc==SQLITE_OK ) pSeg->xNext(p, pSeg, 0);
+      fts5MultiIterAdvanced(p, pIter, iEq, iIter);
+    }
+  }
+  fts5MultiIterSetEof(pIter);
+  fts5AssertMultiIterSetup(p, pIter);
+
+  if( (pIter->bSkipEmpty && fts5MultiIterIsEmpty(p, pIter))
+   || fts5MultiIterIsDeleted(pIter)
+  ){
+    fts5MultiIterNext(p, pIter, 0, 0);
+  }else if( pIter->base.bEof==0 ){
+    Fts5SegIter *pSeg = &pIter->aSeg[pIter->aFirst[1].iFirst];
+    pIter->xSetOutputs(pIter, pSeg);
+  }
+}
+
+/*
+** Allocate a new Fts5Iter object.
+**
+** The new object will be used to iterate through data in structure pStruct.
+** If iLevel is -ve, then all data in all segments is merged. Or, if iLevel
+** is zero or greater, data from the first nSegment segments on level iLevel
+** is merged.
+**
+** The iterator initially points to the first term/rowid entry in the 
+** iterated data.
+*/
+static void fts5MultiIterNew(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  Fts5Structure *pStruct,         /* Structure of specific index */
+  int flags,                      /* FTS5INDEX_QUERY_XXX flags */
+  Fts5Colset *pColset,            /* Colset to filter on (or NULL) */
+  const u8 *pTerm, int nTerm,     /* Term to seek to (or NULL/0) */
+  int iLevel,                     /* Level to iterate (-1 for all) */
+  int nSegment,                   /* Number of segments to merge (iLevel>=0) */
+  Fts5Iter **ppOut                /* New object */
+){
+  int nSeg = 0;                   /* Number of segment-iters in use */
+  int iIter = 0;                  /* */
+  int iSeg;                       /* Used to iterate through segments */
+  Fts5StructureLevel *pLvl;
+  Fts5Iter *pNew;
+
+  assert( (pTerm==0 && nTerm==0) || iLevel<0 );
+
+  /* Allocate space for the new multi-seg-iterator. */
+  if( p->rc==SQLITE_OK ){
+    if( iLevel<0 ){
+      assert( pStruct->nSegment==fts5StructureCountSegments(pStruct) );
+      nSeg = pStruct->nSegment;
+      nSeg += (p->pHash && 0==(flags & FTS5INDEX_QUERY_SKIPHASH));
+    }else{
+      nSeg = MIN(pStruct->aLevel[iLevel].nSeg, nSegment);
+    }
+  }
+  *ppOut = pNew = fts5MultiIterAlloc(p, nSeg);
+  if( pNew==0 ){
+    assert( p->rc!=SQLITE_OK );
+    goto fts5MultiIterNew_post_check;
+  }
+  pNew->bRev = (0!=(flags & FTS5INDEX_QUERY_DESC));
+  pNew->bSkipEmpty = (0!=(flags & FTS5INDEX_QUERY_SKIPEMPTY));
+  pNew->pColset = pColset;
+  if( (flags & FTS5INDEX_QUERY_NOOUTPUT)==0 ){
+    fts5IterSetOutputCb(&p->rc, pNew);
+  }
+
+  /* Initialize each of the component segment iterators. */
+  if( p->rc==SQLITE_OK ){
+    if( iLevel<0 ){
+      Fts5StructureLevel *pEnd = &pStruct->aLevel[pStruct->nLevel];
+      if( p->pHash && 0==(flags & FTS5INDEX_QUERY_SKIPHASH) ){
+        /* Add a segment iterator for the current contents of the hash table. */
+        Fts5SegIter *pIter = &pNew->aSeg[iIter++];
+        fts5SegIterHashInit(p, pTerm, nTerm, flags, pIter);
+      }
+      for(pLvl=&pStruct->aLevel[0]; pLvl<pEnd; pLvl++){
+        for(iSeg=pLvl->nSeg-1; iSeg>=0; iSeg--){
+          Fts5StructureSegment *pSeg = &pLvl->aSeg[iSeg];
+          Fts5SegIter *pIter = &pNew->aSeg[iIter++];
+          if( pTerm==0 ){
+            fts5SegIterInit(p, pSeg, pIter);
+          }else{
+            fts5SegIterSeekInit(p, pTerm, nTerm, flags, pSeg, pIter);
+          }
+        }
+      }
+    }else{
+      pLvl = &pStruct->aLevel[iLevel];
+      for(iSeg=nSeg-1; iSeg>=0; iSeg--){
+        fts5SegIterInit(p, &pLvl->aSeg[iSeg], &pNew->aSeg[iIter++]);
+      }
+    }
+    assert( iIter==nSeg );
+  }
+
+  /* If the above was successful, each component iterator now points 
+  ** to the first entry in its segment. In this case initialize the 
+  ** aFirst[] array. Or, if an error has occurred, free the iterator
+  ** object and set the output variable to NULL.  */
+  if( p->rc==SQLITE_OK ){
+    fts5MultiIterFinishSetup(p, pNew);
+  }else{
+    fts5MultiIterFree(pNew);
+    *ppOut = 0;
+  }
+
+fts5MultiIterNew_post_check:
+  assert( (*ppOut)!=0 || p->rc!=SQLITE_OK );
+  return;
+}
+
+/*
+** Create an Fts5Iter that iterates through the doclist provided
+** as the second argument.
+*/
+static void fts5MultiIterNew2(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  Fts5Data *pData,                /* Doclist to iterate through */
+  int bDesc,                      /* True for descending rowid order */
+  Fts5Iter **ppOut                /* New object */
+){
+  Fts5Iter *pNew;
+  pNew = fts5MultiIterAlloc(p, 2);
+  if( pNew ){
+    Fts5SegIter *pIter = &pNew->aSeg[1];
+    pIter->flags = FTS5_SEGITER_ONETERM;
+    if( pData->szLeaf>0 ){
+      pIter->pLeaf = pData;
+      pIter->iLeafOffset = fts5GetVarint(pData->p, (u64*)&pIter->iRowid);
+      pIter->iEndofDoclist = pData->nn;
+      pNew->aFirst[1].iFirst = 1;
+      if( bDesc ){
+        pNew->bRev = 1;
+        pIter->flags |= FTS5_SEGITER_REVERSE;
+        fts5SegIterReverseInitPage(p, pIter);
+      }else{
+        fts5SegIterLoadNPos(p, pIter);
+      }
+      pData = 0;
+    }else{
+      pNew->base.bEof = 1;
+    }
+    fts5SegIterSetNext(p, pIter);
+
+    *ppOut = pNew;
+  }
+
+  fts5DataRelease(pData);
+}
+
+/*
+** Return true if the iterator is at EOF or if an error has occurred. 
+** False otherwise.
+*/
+static int fts5MultiIterEof(Fts5Index *p, Fts5Iter *pIter){
+  assert( pIter!=0 || p->rc!=SQLITE_OK );
+  assert( p->rc!=SQLITE_OK
+      || (pIter->aSeg[ pIter->aFirst[1].iFirst ].pLeaf==0)==pIter->base.bEof 
+  );
+  return (p->rc || pIter->base.bEof);
+}
+
+/*
+** Return the rowid of the entry that the iterator currently points
+** to. If the iterator points to EOF when this function is called the
+** results are undefined.
+*/
+static i64 fts5MultiIterRowid(Fts5Iter *pIter){
+  assert( pIter->aSeg[ pIter->aFirst[1].iFirst ].pLeaf );
+  return pIter->aSeg[ pIter->aFirst[1].iFirst ].iRowid;
+}
+
+/*
+** Move the iterator to the next entry at or following iMatch.
+*/
+static void fts5MultiIterNextFrom(
+  Fts5Index *p, 
+  Fts5Iter *pIter, 
+  i64 iMatch
+){
+  while( 1 ){
+    i64 iRowid;
+    fts5MultiIterNext(p, pIter, 1, iMatch);
+    if( fts5MultiIterEof(p, pIter) ) break;
+    iRowid = fts5MultiIterRowid(pIter);
+    if( pIter->bRev==0 && iRowid>=iMatch ) break;
+    if( pIter->bRev!=0 && iRowid<=iMatch ) break;
+  }
+}
+
+/*
+** Return a pointer to a buffer containing the term associated with the 
+** entry that the iterator currently points to.
+*/
+static const u8 *fts5MultiIterTerm(Fts5Iter *pIter, int *pn){
+  Fts5SegIter *p = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+  *pn = p->term.n;
+  return p->term.p;
+}
+
+/*
+** Allocate a new segment-id for the structure pStruct. The new segment
+** id must be between 1 and 65335 inclusive, and must not be used by 
+** any currently existing segment. If a free segment id cannot be found,
+** SQLITE_FULL is returned.
+**
+** If an error has already occurred, this function is a no-op. 0 is 
+** returned in this case.
+*/
+static int fts5AllocateSegid(Fts5Index *p, Fts5Structure *pStruct){
+  int iSegid = 0;
+
+  if( p->rc==SQLITE_OK ){
+    if( pStruct->nSegment>=FTS5_MAX_SEGMENT ){
+      p->rc = SQLITE_FULL;
+    }else{
+      /* FTS5_MAX_SEGMENT is currently defined as 2000. So the following
+      ** array is 63 elements, or 252 bytes, in size.  */
+      u32 aUsed[(FTS5_MAX_SEGMENT+31) / 32];
+      int iLvl, iSeg;
+      int i;
+      u32 mask;
+      memset(aUsed, 0, sizeof(aUsed));
+      for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+        for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+          int iId = pStruct->aLevel[iLvl].aSeg[iSeg].iSegid;
+          if( iId<=FTS5_MAX_SEGMENT && iId>0 ){
+            aUsed[(iId-1) / 32] |= (u32)1 << ((iId-1) % 32);
+          }
+        }
+      }
+
+      for(i=0; aUsed[i]==0xFFFFFFFF; i++);
+      mask = aUsed[i];
+      for(iSegid=0; mask & ((u32)1 << iSegid); iSegid++);
+      iSegid += 1 + i*32;
+
+#ifdef SQLITE_DEBUG
+      for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+        for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+          assert_nc( iSegid!=pStruct->aLevel[iLvl].aSeg[iSeg].iSegid );
+        }
+      }
+      assert_nc( iSegid>0 && iSegid<=FTS5_MAX_SEGMENT );
+
+      {
+        sqlite3_stmt *pIdxSelect = fts5IdxSelectStmt(p);
+        if( p->rc==SQLITE_OK ){
+          u8 aBlob[2] = {0xff, 0xff};
+          sqlite3_bind_int(pIdxSelect, 1, iSegid);
+          sqlite3_bind_blob(pIdxSelect, 2, aBlob, 2, SQLITE_STATIC);
+          assert_nc( sqlite3_step(pIdxSelect)!=SQLITE_ROW );
+          p->rc = sqlite3_reset(pIdxSelect);
+          sqlite3_bind_null(pIdxSelect, 2);
+        }
+      }
+#endif
+    }
+  }
+
+  return iSegid;
+}
+
+/*
+** Discard all data currently cached in the hash-tables.
+*/
+static void fts5IndexDiscardData(Fts5Index *p){
+  assert( p->pHash || p->nPendingData==0 );
+  if( p->pHash ){
+    sqlite3Fts5HashClear(p->pHash);
+    p->nPendingData = 0;
+    p->nPendingRow = 0;
+    p->flushRc = SQLITE_OK;
+  }
+  p->nContentlessDelete = 0;
+}
+
+/*
+** Return the size of the prefix, in bytes, that buffer 
+** (pNew/<length-unknown>) shares with buffer (pOld/nOld).
+**
+** Buffer (pNew/<length-unknown>) is guaranteed to be greater 
+** than buffer (pOld/nOld).
+*/
+static int fts5PrefixCompress(int nOld, const u8 *pOld, const u8 *pNew){
+  int i;
+  for(i=0; i<nOld; i++){
+    if( pOld[i]!=pNew[i] ) break;
+  }
+  return i;
+}
+
+static void fts5WriteDlidxClear(
+  Fts5Index *p, 
+  Fts5SegWriter *pWriter,
+  int bFlush                      /* If true, write dlidx to disk */
+){
+  int i;
+  assert( bFlush==0 || (pWriter->nDlidx>0 && pWriter->aDlidx[0].buf.n>0) );
+  for(i=0; i<pWriter->nDlidx; i++){
+    Fts5DlidxWriter *pDlidx = &pWriter->aDlidx[i];
+    if( pDlidx->buf.n==0 ) break;
+    if( bFlush ){
+      assert( pDlidx->pgno!=0 );
+      fts5DataWrite(p, 
+          FTS5_DLIDX_ROWID(pWriter->iSegid, i, pDlidx->pgno),
+          pDlidx->buf.p, pDlidx->buf.n
+      );
+    }
+    sqlite3Fts5BufferZero(&pDlidx->buf);
+    pDlidx->bPrevValid = 0;
+  }
+}
+
+/*
+** Grow the pWriter->aDlidx[] array to at least nLvl elements in size.
+** Any new array elements are zeroed before returning.
+*/
+static int fts5WriteDlidxGrow(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  int nLvl
+){
+  if( p->rc==SQLITE_OK && nLvl>=pWriter->nDlidx ){
+    Fts5DlidxWriter *aDlidx = (Fts5DlidxWriter*)sqlite3_realloc64(
+        pWriter->aDlidx, sizeof(Fts5DlidxWriter) * nLvl
+    );
+    if( aDlidx==0 ){
+      p->rc = SQLITE_NOMEM;
+    }else{
+      size_t nByte = sizeof(Fts5DlidxWriter) * (nLvl - pWriter->nDlidx);
+      memset(&aDlidx[pWriter->nDlidx], 0, nByte);
+      pWriter->aDlidx = aDlidx;
+      pWriter->nDlidx = nLvl;
+    }
+  }
+  return p->rc;
+}
+
+/*
+** If the current doclist-index accumulating in pWriter->aDlidx[] is large
+** enough, flush it to disk and return 1. Otherwise discard it and return
+** zero.
+*/
+static int fts5WriteFlushDlidx(Fts5Index *p, Fts5SegWriter *pWriter){
+  int bFlag = 0;
+
+  /* If there were FTS5_MIN_DLIDX_SIZE or more empty leaf pages written
+  ** to the database, also write the doclist-index to disk.  */
+  if( pWriter->aDlidx[0].buf.n>0 && pWriter->nEmpty>=FTS5_MIN_DLIDX_SIZE ){
+    bFlag = 1;
+  }
+  fts5WriteDlidxClear(p, pWriter, bFlag);
+  pWriter->nEmpty = 0;
+  return bFlag;
+}
+
+/*
+** This function is called whenever processing of the doclist for the 
+** last term on leaf page (pWriter->iBtPage) is completed. 
+**
+** The doclist-index for that term is currently stored in-memory within the
+** Fts5SegWriter.aDlidx[] array. If it is large enough, this function
+** writes it out to disk. Or, if it is too small to bother with, discards
+** it.
+**
+** Fts5SegWriter.btterm currently contains the first term on page iBtPage.
+*/
+static void fts5WriteFlushBtree(Fts5Index *p, Fts5SegWriter *pWriter){
+  int bFlag;
+
+  assert( pWriter->iBtPage || pWriter->nEmpty==0 );
+  if( pWriter->iBtPage==0 ) return;
+  bFlag = fts5WriteFlushDlidx(p, pWriter);
+
+  if( p->rc==SQLITE_OK ){
+    const char *z = (pWriter->btterm.n>0?(const char*)pWriter->btterm.p:"");
+    /* The following was already done in fts5WriteInit(): */
+    /* sqlite3_bind_int(p->pIdxWriter, 1, pWriter->iSegid); */
+    sqlite3_bind_blob(p->pIdxWriter, 2, z, pWriter->btterm.n, SQLITE_STATIC);
+    sqlite3_bind_int64(p->pIdxWriter, 3, bFlag + ((i64)pWriter->iBtPage<<1));
+    sqlite3_step(p->pIdxWriter);
+    p->rc = sqlite3_reset(p->pIdxWriter);
+    sqlite3_bind_null(p->pIdxWriter, 2);
+  }
+  pWriter->iBtPage = 0;
+}
+
+/*
+** This is called once for each leaf page except the first that contains
+** at least one term. Argument (nTerm/pTerm) is the split-key - a term that
+** is larger than all terms written to earlier leaves, and equal to or
+** smaller than the first term on the new leaf.
+**
+** If an error occurs, an error code is left in Fts5Index.rc. If an error
+** has already occurred when this function is called, it is a no-op.
+*/
+static void fts5WriteBtreeTerm(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegWriter *pWriter,         /* Writer object */
+  int nTerm, const u8 *pTerm      /* First term on new page */
+){
+  fts5WriteFlushBtree(p, pWriter);
+  if( p->rc==SQLITE_OK ){
+    fts5BufferSet(&p->rc, &pWriter->btterm, nTerm, pTerm);
+    pWriter->iBtPage = pWriter->writer.pgno;
+  }
+}
+
+/*
+** This function is called when flushing a leaf page that contains no
+** terms at all to disk.
+*/
+static void fts5WriteBtreeNoTerm(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegWriter *pWriter          /* Writer object */
+){
+  /* If there were no rowids on the leaf page either and the doclist-index
+  ** has already been started, append an 0x00 byte to it.  */
+  if( pWriter->bFirstRowidInPage && pWriter->aDlidx[0].buf.n>0 ){
+    Fts5DlidxWriter *pDlidx = &pWriter->aDlidx[0];
+    assert( pDlidx->bPrevValid );
+    sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, 0);
+  }
+
+  /* Increment the "number of sequential leaves without a term" counter. */
+  pWriter->nEmpty++;
+}
+
+static i64 fts5DlidxExtractFirstRowid(Fts5Buffer *pBuf){
+  i64 iRowid;
+  int iOff;
+
+  iOff = 1 + fts5GetVarint(&pBuf->p[1], (u64*)&iRowid);
+  fts5GetVarint(&pBuf->p[iOff], (u64*)&iRowid);
+  return iRowid;
+}
+
+/*
+** Rowid iRowid has just been appended to the current leaf page. It is the
+** first on the page. This function appends an appropriate entry to the current
+** doclist-index.
+*/
+static void fts5WriteDlidxAppend(
+  Fts5Index *p, 
+  Fts5SegWriter *pWriter, 
+  i64 iRowid
+){
+  int i;
+  int bDone = 0;
+
+  for(i=0; p->rc==SQLITE_OK && bDone==0; i++){
+    i64 iVal;
+    Fts5DlidxWriter *pDlidx = &pWriter->aDlidx[i];
+
+    if( pDlidx->buf.n>=p->pConfig->pgsz ){
+      /* The current doclist-index page is full. Write it to disk and push
+      ** a copy of iRowid (which will become the first rowid on the next
+      ** doclist-index leaf page) up into the next level of the b-tree 
+      ** hierarchy. If the node being flushed is currently the root node,
+      ** also push its first rowid upwards. */
+      pDlidx->buf.p[0] = 0x01;    /* Not the root node */
+      fts5DataWrite(p, 
+          FTS5_DLIDX_ROWID(pWriter->iSegid, i, pDlidx->pgno),
+          pDlidx->buf.p, pDlidx->buf.n
+      );
+      fts5WriteDlidxGrow(p, pWriter, i+2);
+      pDlidx = &pWriter->aDlidx[i];
+      if( p->rc==SQLITE_OK && pDlidx[1].buf.n==0 ){
+        i64 iFirst = fts5DlidxExtractFirstRowid(&pDlidx->buf);
+
+        /* This was the root node. Push its first rowid up to the new root. */
+        pDlidx[1].pgno = pDlidx->pgno;
+        sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx[1].buf, 0);
+        sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx[1].buf, pDlidx->pgno);
+        sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx[1].buf, iFirst);
+        pDlidx[1].bPrevValid = 1;
+        pDlidx[1].iPrev = iFirst;
+      }
+
+      sqlite3Fts5BufferZero(&pDlidx->buf);
+      pDlidx->bPrevValid = 0;
+      pDlidx->pgno++;
+    }else{
+      bDone = 1;
+    }
+
+    if( pDlidx->bPrevValid ){
+      iVal = (u64)iRowid - (u64)pDlidx->iPrev;
+    }else{
+      i64 iPgno = (i==0 ? pWriter->writer.pgno : pDlidx[-1].pgno);
+      assert( pDlidx->buf.n==0 );
+      sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, !bDone);
+      sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, iPgno);
+      iVal = iRowid;
+    }
+
+    sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, iVal);
+    pDlidx->bPrevValid = 1;
+    pDlidx->iPrev = iRowid;
+  }
+}
+
+static void fts5WriteFlushLeaf(Fts5Index *p, Fts5SegWriter *pWriter){
+  static const u8 zero[] = { 0x00, 0x00, 0x00, 0x00 };
+  Fts5PageWriter *pPage = &pWriter->writer;
+  i64 iRowid;
+
+  assert( (pPage->pgidx.n==0)==(pWriter->bFirstTermInPage) );
+
+  /* Set the szLeaf header field. */
+  assert( 0==fts5GetU16(&pPage->buf.p[2]) );
+  fts5PutU16(&pPage->buf.p[2], (u16)pPage->buf.n);
+
+  if( pWriter->bFirstTermInPage ){
+    /* No term was written to this page. */
+    assert( pPage->pgidx.n==0 );
+    fts5WriteBtreeNoTerm(p, pWriter);
+  }else{
+    /* Append the pgidx to the page buffer. Set the szLeaf header field. */
+    fts5BufferAppendBlob(&p->rc, &pPage->buf, pPage->pgidx.n, pPage->pgidx.p);
+  }
+
+  /* Write the page out to disk */
+  iRowid = FTS5_SEGMENT_ROWID(pWriter->iSegid, pPage->pgno);
+  fts5DataWrite(p, iRowid, pPage->buf.p, pPage->buf.n);
+
+  /* Initialize the next page. */
+  fts5BufferZero(&pPage->buf);
+  fts5BufferZero(&pPage->pgidx);
+  fts5BufferAppendBlob(&p->rc, &pPage->buf, 4, zero);
+  pPage->iPrevPgidx = 0;
+  pPage->pgno++;
+
+  /* Increase the leaves written counter */
+  pWriter->nLeafWritten++;
+
+  /* The new leaf holds no terms or rowids */
+  pWriter->bFirstTermInPage = 1;
+  pWriter->bFirstRowidInPage = 1;
+}
+
+/*
+** Append term pTerm/nTerm to the segment being written by the writer passed
+** as the second argument.
+**
+** If an error occurs, set the Fts5Index.rc error code. If an error has 
+** already occurred, this function is a no-op.
+*/
+static void fts5WriteAppendTerm(
+  Fts5Index *p, 
+  Fts5SegWriter *pWriter,
+  int nTerm, const u8 *pTerm 
+){
+  int nPrefix;                    /* Bytes of prefix compression for term */
+  Fts5PageWriter *pPage = &pWriter->writer;
+  Fts5Buffer *pPgidx = &pWriter->writer.pgidx;
+  int nMin = MIN(pPage->term.n, nTerm);
+
+  assert( p->rc==SQLITE_OK );
+  assert( pPage->buf.n>=4 );
+  assert( pPage->buf.n>4 || pWriter->bFirstTermInPage );
+
+  /* If the current leaf page is full, flush it to disk. */
+  if( (pPage->buf.n + pPgidx->n + nTerm + 2)>=p->pConfig->pgsz ){
+    if( pPage->buf.n>4 ){
+      fts5WriteFlushLeaf(p, pWriter);
+      if( p->rc!=SQLITE_OK ) return;
+    }
+    fts5BufferGrow(&p->rc, &pPage->buf, nTerm+FTS5_DATA_PADDING);
+  }
+  
+  /* TODO1: Updating pgidx here. */
+  pPgidx->n += sqlite3Fts5PutVarint(
+      &pPgidx->p[pPgidx->n], pPage->buf.n - pPage->iPrevPgidx
+  );
+  pPage->iPrevPgidx = pPage->buf.n;
+#if 0
+  fts5PutU16(&pPgidx->p[pPgidx->n], pPage->buf.n);
+  pPgidx->n += 2;
+#endif
+
+  if( pWriter->bFirstTermInPage ){
+    nPrefix = 0;
+    if( pPage->pgno!=1 ){
+      /* This is the first term on a leaf that is not the leftmost leaf in
+      ** the segment b-tree. In this case it is necessary to add a term to
+      ** the b-tree hierarchy that is (a) larger than the largest term 
+      ** already written to the segment and (b) smaller than or equal to
+      ** this term. In other words, a prefix of (pTerm/nTerm) that is one
+      ** byte longer than the longest prefix (pTerm/nTerm) shares with the
+      ** previous term. 
+      **
+      ** Usually, the previous term is available in pPage->term. The exception
+      ** is if this is the first term written in an incremental-merge step.
+      ** In this case the previous term is not available, so just write a
+      ** copy of (pTerm/nTerm) into the parent node. This is slightly
+      ** inefficient, but still correct.  */
+      int n = nTerm;
+      if( pPage->term.n ){
+        n = 1 + fts5PrefixCompress(nMin, pPage->term.p, pTerm);
+      }
+      fts5WriteBtreeTerm(p, pWriter, n, pTerm);
+      if( p->rc!=SQLITE_OK ) return;
+      pPage = &pWriter->writer;
+    }
+  }else{
+    nPrefix = fts5PrefixCompress(nMin, pPage->term.p, pTerm);
+    fts5BufferAppendVarint(&p->rc, &pPage->buf, nPrefix);
+  }
+
+  /* Append the number of bytes of new data, then the term data itself
+  ** to the page. */
+  fts5BufferAppendVarint(&p->rc, &pPage->buf, nTerm - nPrefix);
+  fts5BufferAppendBlob(&p->rc, &pPage->buf, nTerm - nPrefix, &pTerm[nPrefix]);
+
+  /* Update the Fts5PageWriter.term field. */
+  fts5BufferSet(&p->rc, &pPage->term, nTerm, pTerm);
+  pWriter->bFirstTermInPage = 0;
+
+  pWriter->bFirstRowidInPage = 0;
+  pWriter->bFirstRowidInDoclist = 1;
+
+  assert( p->rc || (pWriter->nDlidx>0 && pWriter->aDlidx[0].buf.n==0) );
+  pWriter->aDlidx[0].pgno = pPage->pgno;
+}
+
+/*
+** Append a rowid and position-list size field to the writers output. 
+*/
+static void fts5WriteAppendRowid(
+  Fts5Index *p, 
+  Fts5SegWriter *pWriter,
+  i64 iRowid
+){
+  if( p->rc==SQLITE_OK ){
+    Fts5PageWriter *pPage = &pWriter->writer;
+
+    if( (pPage->buf.n + pPage->pgidx.n)>=p->pConfig->pgsz ){
+      fts5WriteFlushLeaf(p, pWriter);
+    }
+
+    /* If this is to be the first rowid written to the page, set the 
+    ** rowid-pointer in the page-header. Also append a value to the dlidx
+    ** buffer, in case a doclist-index is required.  */
+    if( pWriter->bFirstRowidInPage ){
+      fts5PutU16(pPage->buf.p, (u16)pPage->buf.n);
+      fts5WriteDlidxAppend(p, pWriter, iRowid);
+    }
+
+    /* Write the rowid. */
+    if( pWriter->bFirstRowidInDoclist || pWriter->bFirstRowidInPage ){
+      fts5BufferAppendVarint(&p->rc, &pPage->buf, iRowid);
+    }else{
+      assert_nc( p->rc || iRowid>pWriter->iPrevRowid );
+      fts5BufferAppendVarint(&p->rc, &pPage->buf, 
+          (u64)iRowid - (u64)pWriter->iPrevRowid
+      );
+    }
+    pWriter->iPrevRowid = iRowid;
+    pWriter->bFirstRowidInDoclist = 0;
+    pWriter->bFirstRowidInPage = 0;
+  }
+}
+
+static void fts5WriteAppendPoslistData(
+  Fts5Index *p, 
+  Fts5SegWriter *pWriter, 
+  const u8 *aData, 
+  int nData
+){
+  Fts5PageWriter *pPage = &pWriter->writer;
+  const u8 *a = aData;
+  int n = nData;
+  
+  assert( p->pConfig->pgsz>0 || p->rc!=SQLITE_OK );
+  while( p->rc==SQLITE_OK 
+     && (pPage->buf.n + pPage->pgidx.n + n)>=p->pConfig->pgsz 
+  ){
+    int nReq = p->pConfig->pgsz - pPage->buf.n - pPage->pgidx.n;
+    int nCopy = 0;
+    while( nCopy<nReq ){
+      i64 dummy;
+      nCopy += fts5GetVarint(&a[nCopy], (u64*)&dummy);
+    }
+    fts5BufferAppendBlob(&p->rc, &pPage->buf, nCopy, a);
+    a += nCopy;
+    n -= nCopy;
+    fts5WriteFlushLeaf(p, pWriter);
+  }
+  if( n>0 ){
+    fts5BufferAppendBlob(&p->rc, &pPage->buf, n, a);
+  }
+}
+
+/*
+** Flush any data cached by the writer object to the database. Free any
+** allocations associated with the writer.
+*/
+static void fts5WriteFinish(
+  Fts5Index *p, 
+  Fts5SegWriter *pWriter,         /* Writer object */
+  int *pnLeaf                     /* OUT: Number of leaf pages in b-tree */
+){
+  int i;
+  Fts5PageWriter *pLeaf = &pWriter->writer;
+  if( p->rc==SQLITE_OK ){
+    assert( pLeaf->pgno>=1 );
+    if( pLeaf->buf.n>4 ){
+      fts5WriteFlushLeaf(p, pWriter);
+    }
+    *pnLeaf = pLeaf->pgno-1;
+    if( pLeaf->pgno>1 ){
+      fts5WriteFlushBtree(p, pWriter);
+    }
+  }
+  fts5BufferFree(&pLeaf->term);
+  fts5BufferFree(&pLeaf->buf);
+  fts5BufferFree(&pLeaf->pgidx);
+  fts5BufferFree(&pWriter->btterm);
+
+  for(i=0; i<pWriter->nDlidx; i++){
+    sqlite3Fts5BufferFree(&pWriter->aDlidx[i].buf);
+  }
+  sqlite3_free(pWriter->aDlidx);
+}
+
+static void fts5WriteInit(
+  Fts5Index *p, 
+  Fts5SegWriter *pWriter, 
+  int iSegid
+){
+  const int nBuffer = p->pConfig->pgsz + FTS5_DATA_PADDING;
+
+  memset(pWriter, 0, sizeof(Fts5SegWriter));
+  pWriter->iSegid = iSegid;
+
+  fts5WriteDlidxGrow(p, pWriter, 1);
+  pWriter->writer.pgno = 1;
+  pWriter->bFirstTermInPage = 1;
+  pWriter->iBtPage = 1;
+
+  assert( pWriter->writer.buf.n==0 );
+  assert( pWriter->writer.pgidx.n==0 );
+
+  /* Grow the two buffers to pgsz + padding bytes in size. */
+  sqlite3Fts5BufferSize(&p->rc, &pWriter->writer.pgidx, nBuffer);
+  sqlite3Fts5BufferSize(&p->rc, &pWriter->writer.buf, nBuffer);
+
+  if( p->pIdxWriter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pIdxWriter, sqlite3_mprintf(
+          "INSERT INTO '%q'.'%q_idx'(segid,term,pgno) VALUES(?,?,?)", 
+          pConfig->zDb, pConfig->zName
+    ));
+  }
+
+  if( p->rc==SQLITE_OK ){
+    /* Initialize the 4-byte leaf-page header to 0x00. */
+    memset(pWriter->writer.buf.p, 0, 4);
+    pWriter->writer.buf.n = 4;
+
+    /* Bind the current output segment id to the index-writer. This is an
+    ** optimization over binding the same value over and over as rows are
+    ** inserted into %_idx by the current writer.  */
+    sqlite3_bind_int(p->pIdxWriter, 1, pWriter->iSegid);
+  }
+}
+
+/*
+** Iterator pIter was used to iterate through the input segments of on an
+** incremental merge operation. This function is called if the incremental
+** merge step has finished but the input has not been completely exhausted.
+*/
+static void fts5TrimSegments(Fts5Index *p, Fts5Iter *pIter){
+  int i;
+  Fts5Buffer buf;
+  memset(&buf, 0, sizeof(Fts5Buffer));
+  for(i=0; i<pIter->nSeg && p->rc==SQLITE_OK; i++){
+    Fts5SegIter *pSeg = &pIter->aSeg[i];
+    if( pSeg->pSeg==0 ){
+      /* no-op */
+    }else if( pSeg->pLeaf==0 ){
+      /* All keys from this input segment have been transfered to the output.
+      ** Set both the first and last page-numbers to 0 to indicate that the
+      ** segment is now empty. */
+      pSeg->pSeg->pgnoLast = 0;
+      pSeg->pSeg->pgnoFirst = 0;
+    }else{
+      int iOff = pSeg->iTermLeafOffset;     /* Offset on new first leaf page */
+      i64 iLeafRowid;
+      Fts5Data *pData;
+      int iId = pSeg->pSeg->iSegid;
+      u8 aHdr[4] = {0x00, 0x00, 0x00, 0x00};
+
+      iLeafRowid = FTS5_SEGMENT_ROWID(iId, pSeg->iTermLeafPgno);
+      pData = fts5LeafRead(p, iLeafRowid);
+      if( pData ){
+        if( iOff>pData->szLeaf ){
+          /* This can occur if the pages that the segments occupy overlap - if
+          ** a single page has been assigned to more than one segment. In
+          ** this case a prior iteration of this loop may have corrupted the
+          ** segment currently being trimmed.  */
+          p->rc = FTS5_CORRUPT;
+        }else{
+          fts5BufferZero(&buf);
+          fts5BufferGrow(&p->rc, &buf, pData->nn);
+          fts5BufferAppendBlob(&p->rc, &buf, sizeof(aHdr), aHdr);
+          fts5BufferAppendVarint(&p->rc, &buf, pSeg->term.n);
+          fts5BufferAppendBlob(&p->rc, &buf, pSeg->term.n, pSeg->term.p);
+          fts5BufferAppendBlob(&p->rc, &buf,pData->szLeaf-iOff,&pData->p[iOff]);
+          if( p->rc==SQLITE_OK ){
+            /* Set the szLeaf field */
+            fts5PutU16(&buf.p[2], (u16)buf.n);
+          }
+
+          /* Set up the new page-index array */
+          fts5BufferAppendVarint(&p->rc, &buf, 4);
+          if( pSeg->iLeafPgno==pSeg->iTermLeafPgno 
+           && pSeg->iEndofDoclist<pData->szLeaf
+           && pSeg->iPgidxOff<=pData->nn
+          ){
+            int nDiff = pData->szLeaf - pSeg->iEndofDoclist;
+            fts5BufferAppendVarint(&p->rc, &buf, buf.n - 1 - nDiff - 4);
+            fts5BufferAppendBlob(&p->rc, &buf, 
+                pData->nn - pSeg->iPgidxOff, &pData->p[pSeg->iPgidxOff]
+            );
+          }
+
+          pSeg->pSeg->pgnoFirst = pSeg->iTermLeafPgno;
+          fts5DataDelete(p, FTS5_SEGMENT_ROWID(iId, 1), iLeafRowid);
+          fts5DataWrite(p, iLeafRowid, buf.p, buf.n);
+        }
+        fts5DataRelease(pData);
+      }
+    }
+  }
+  fts5BufferFree(&buf);
+}
+
+static void fts5MergeChunkCallback(
+  Fts5Index *p, 
+  void *pCtx, 
+  const u8 *pChunk, int nChunk
+){
+  Fts5SegWriter *pWriter = (Fts5SegWriter*)pCtx;
+  fts5WriteAppendPoslistData(p, pWriter, pChunk, nChunk);
+}
+
+/*
+**
+*/
+static void fts5IndexMergeLevel(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct,       /* IN/OUT: Stucture of index */
+  int iLvl,                       /* Level to read input from */
+  int *pnRem                      /* Write up to this many output leaves */
+){
+  Fts5Structure *pStruct = *ppStruct;
+  Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+  Fts5StructureLevel *pLvlOut;
+  Fts5Iter *pIter = 0;       /* Iterator to read input data */
+  int nRem = pnRem ? *pnRem : 0;  /* Output leaf pages left to write */
+  int nInput;                     /* Number of input segments */
+  Fts5SegWriter writer;           /* Writer object */
+  Fts5StructureSegment *pSeg;     /* Output segment */
+  Fts5Buffer term;
+  int bOldest;                    /* True if the output segment is the oldest */
+  int eDetail = p->pConfig->eDetail;
+  const int flags = FTS5INDEX_QUERY_NOOUTPUT;
+  int bTermWritten = 0;           /* True if current term already output */
+
+  assert( iLvl<pStruct->nLevel );
+  assert( pLvl->nMerge<=pLvl->nSeg );
+
+  memset(&writer, 0, sizeof(Fts5SegWriter));
+  memset(&term, 0, sizeof(Fts5Buffer));
+  if( pLvl->nMerge ){
+    pLvlOut = &pStruct->aLevel[iLvl+1];
+    assert( pLvlOut->nSeg>0 );
+    nInput = pLvl->nMerge;
+    pSeg = &pLvlOut->aSeg[pLvlOut->nSeg-1];
+
+    fts5WriteInit(p, &writer, pSeg->iSegid);
+    writer.writer.pgno = pSeg->pgnoLast+1;
+    writer.iBtPage = 0;
+  }else{
+    int iSegid = fts5AllocateSegid(p, pStruct);
+
+    /* Extend the Fts5Structure object as required to ensure the output
+    ** segment exists. */
+    if( iLvl==pStruct->nLevel-1 ){
+      fts5StructureAddLevel(&p->rc, ppStruct);
+      pStruct = *ppStruct;
+    }
+    fts5StructureExtendLevel(&p->rc, pStruct, iLvl+1, 1, 0);
+    if( p->rc ) return;
+    pLvl = &pStruct->aLevel[iLvl];
+    pLvlOut = &pStruct->aLevel[iLvl+1];
+
+    fts5WriteInit(p, &writer, iSegid);
+
+    /* Add the new segment to the output level */
+    pSeg = &pLvlOut->aSeg[pLvlOut->nSeg];
+    pLvlOut->nSeg++;
+    pSeg->pgnoFirst = 1;
+    pSeg->iSegid = iSegid;
+    pStruct->nSegment++;
+
+    /* Read input from all segments in the input level */
+    nInput = pLvl->nSeg;
+
+    /* Set the range of origins that will go into the output segment. */
+    if( pStruct->nOriginCntr>0 ){
+      pSeg->iOrigin1 = pLvl->aSeg[0].iOrigin1;
+      pSeg->iOrigin2 = pLvl->aSeg[pLvl->nSeg-1].iOrigin2;
+    }
+  }
+  bOldest = (pLvlOut->nSeg==1 && pStruct->nLevel==iLvl+2);
+
+  assert( iLvl>=0 );
+  for(fts5MultiIterNew(p, pStruct, flags, 0, 0, 0, iLvl, nInput, &pIter);
+      fts5MultiIterEof(p, pIter)==0;
+      fts5MultiIterNext(p, pIter, 0, 0)
+  ){
+    Fts5SegIter *pSegIter = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+    int nPos;                     /* position-list size field value */
+    int nTerm;
+    const u8 *pTerm;
+
+    pTerm = fts5MultiIterTerm(pIter, &nTerm);
+    if( nTerm!=term.n || fts5Memcmp(pTerm, term.p, nTerm) ){
+      if( pnRem && writer.nLeafWritten>nRem ){
+        break;
+      }
+      fts5BufferSet(&p->rc, &term, nTerm, pTerm);
+      bTermWritten =0;
+    }
+
+    /* Check for key annihilation. */
+    if( pSegIter->nPos==0 && (bOldest || pSegIter->bDel==0) ) continue;
+
+    if( p->rc==SQLITE_OK && bTermWritten==0 ){
+      /* This is a new term. Append a term to the output segment. */
+      fts5WriteAppendTerm(p, &writer, nTerm, pTerm);
+      bTermWritten = 1;
+    }
+
+    /* Append the rowid to the output */
+    /* WRITEPOSLISTSIZE */
+    fts5WriteAppendRowid(p, &writer, fts5MultiIterRowid(pIter));
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      if( pSegIter->bDel ){
+        fts5BufferAppendVarint(&p->rc, &writer.writer.buf, 0);
+        if( pSegIter->nPos>0 ){
+          fts5BufferAppendVarint(&p->rc, &writer.writer.buf, 0);
+        }
+      }
+    }else{
+      /* Append the position-list data to the output */
+      nPos = pSegIter->nPos*2 + pSegIter->bDel;
+      fts5BufferAppendVarint(&p->rc, &writer.writer.buf, nPos);
+      fts5ChunkIterate(p, pSegIter, (void*)&writer, fts5MergeChunkCallback);
+    }
+  }
+
+  /* Flush the last leaf page to disk. Set the output segment b-tree height
+  ** and last leaf page number at the same time.  */
+  fts5WriteFinish(p, &writer, &pSeg->pgnoLast);
+
+  assert( pIter!=0 || p->rc!=SQLITE_OK );
+  if( fts5MultiIterEof(p, pIter) ){
+    int i;
+
+    /* Remove the redundant segments from the %_data table */
+    assert( pSeg->nEntry==0 );
+    for(i=0; i<nInput; i++){
+      Fts5StructureSegment *pOld = &pLvl->aSeg[i];
+      pSeg->nEntry += (pOld->nEntry - pOld->nEntryTombstone);
+      fts5DataRemoveSegment(p, pOld);
+    }
+
+    /* Remove the redundant segments from the input level */
+    if( pLvl->nSeg!=nInput ){
+      int nMove = (pLvl->nSeg - nInput) * sizeof(Fts5StructureSegment);
+      memmove(pLvl->aSeg, &pLvl->aSeg[nInput], nMove);
+    }
+    pStruct->nSegment -= nInput;
+    pLvl->nSeg -= nInput;
+    pLvl->nMerge = 0;
+    if( pSeg->pgnoLast==0 ){
+      pLvlOut->nSeg--;
+      pStruct->nSegment--;
+    }
+  }else{
+    assert( pSeg->pgnoLast>0 );
+    fts5TrimSegments(p, pIter);
+    pLvl->nMerge = nInput;
+  }
+
+  fts5MultiIterFree(pIter);
+  fts5BufferFree(&term);
+  if( pnRem ) *pnRem -= writer.nLeafWritten;
+}
+
+/*
+** If this is not a contentless_delete=1 table, or if the 'deletemerge'
+** configuration option is set to 0, then this function always returns -1.
+** Otherwise, it searches the structure object passed as the second argument
+** for a level suitable for merging due to having a large number of 
+** tombstones in the tombstone hash. If one is found, its index is returned.
+** Otherwise, if there is no suitable level, -1.
+*/
+static int fts5IndexFindDeleteMerge(Fts5Index *p, Fts5Structure *pStruct){
+  Fts5Config *pConfig = p->pConfig;
+  int iRet = -1;
+  if( pConfig->bContentlessDelete && pConfig->nDeleteMerge>0 ){
+    int ii;
+    int nBest = 0;
+
+    for(ii=0; ii<pStruct->nLevel; ii++){
+      Fts5StructureLevel *pLvl = &pStruct->aLevel[ii];
+      i64 nEntry = 0;
+      i64 nTomb = 0;
+      int iSeg;
+      for(iSeg=0; iSeg<pLvl->nSeg; iSeg++){
+        nEntry += pLvl->aSeg[iSeg].nEntry;
+        nTomb += pLvl->aSeg[iSeg].nEntryTombstone;
+      }
+      assert_nc( nEntry>0 || pLvl->nSeg==0 );
+      if( nEntry>0 ){
+        int nPercent = (nTomb * 100) / nEntry;
+        if( nPercent>=pConfig->nDeleteMerge && nPercent>nBest ){
+          iRet = ii;
+          nBest = nPercent;
+        }
+      }
+    }
+  }
+  return iRet;
+}
+
+/*
+** Do up to nPg pages of automerge work on the index.
+**
+** Return true if any changes were actually made, or false otherwise.
+*/
+static int fts5IndexMerge(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct,       /* IN/OUT: Current structure of index */
+  int nPg,                        /* Pages of work to do */
+  int nMin                        /* Minimum number of segments to merge */
+){
+  int nRem = nPg;
+  int bRet = 0;
+  Fts5Structure *pStruct = *ppStruct;
+  while( nRem>0 && p->rc==SQLITE_OK ){
+    int iLvl;                   /* To iterate through levels */
+    int iBestLvl = 0;           /* Level offering the most input segments */
+    int nBest = 0;              /* Number of input segments on best level */
+
+    /* Set iBestLvl to the level to read input segments from. Or to -1 if
+    ** there is no level suitable to merge segments from.  */
+    assert( pStruct->nLevel>0 );
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+      if( pLvl->nMerge ){
+        if( pLvl->nMerge>nBest ){
+          iBestLvl = iLvl;
+          nBest = nMin;
+        }
+        break;
+      }
+      if( pLvl->nSeg>nBest ){
+        nBest = pLvl->nSeg;
+        iBestLvl = iLvl;
+      }
+    }
+    if( nBest<nMin ){
+      iBestLvl = fts5IndexFindDeleteMerge(p, pStruct);
+    }
+
+    if( iBestLvl<0 ) break;
+    bRet = 1;
+    fts5IndexMergeLevel(p, &pStruct, iBestLvl, &nRem);
+    if( p->rc==SQLITE_OK && pStruct->aLevel[iBestLvl].nMerge==0 ){
+      fts5StructurePromote(p, iBestLvl+1, pStruct);
+    }
+
+    if( nMin==1 ) nMin = 2;
+  }
+  *ppStruct = pStruct;
+  return bRet;
+}
+
+/*
+** A total of nLeaf leaf pages of data has just been flushed to a level-0
+** segment. This function updates the write-counter accordingly and, if
+** necessary, performs incremental merge work.
+**
+** If an error occurs, set the Fts5Index.rc error code. If an error has 
+** already occurred, this function is a no-op.
+*/
+static void fts5IndexAutomerge(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct,       /* IN/OUT: Current structure of index */
+  int nLeaf                       /* Number of output leaves just written */
+){
+  if( p->rc==SQLITE_OK && p->pConfig->nAutomerge>0 && ALWAYS((*ppStruct)!=0) ){
+    Fts5Structure *pStruct = *ppStruct;
+    u64 nWrite;                   /* Initial value of write-counter */
+    int nWork;                    /* Number of work-quanta to perform */
+    int nRem;                     /* Number of leaf pages left to write */
+
+    /* Update the write-counter. While doing so, set nWork. */
+    nWrite = pStruct->nWriteCounter;
+    nWork = (int)(((nWrite + nLeaf) / p->nWorkUnit) - (nWrite / p->nWorkUnit));
+    pStruct->nWriteCounter += nLeaf;
+    nRem = (int)(p->nWorkUnit * nWork * pStruct->nLevel);
+
+    fts5IndexMerge(p, ppStruct, nRem, p->pConfig->nAutomerge);
+  }
+}
+
+static void fts5IndexCrisismerge(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct        /* IN/OUT: Current structure of index */
+){
+  const int nCrisis = p->pConfig->nCrisisMerge;
+  Fts5Structure *pStruct = *ppStruct;
+  if( pStruct && pStruct->nLevel>0 ){
+    int iLvl = 0;
+    while( p->rc==SQLITE_OK && pStruct->aLevel[iLvl].nSeg>=nCrisis ){
+      fts5IndexMergeLevel(p, &pStruct, iLvl, 0);
+      assert( p->rc!=SQLITE_OK || pStruct->nLevel>(iLvl+1) );
+      fts5StructurePromote(p, iLvl+1, pStruct);
+      iLvl++;
+    }
+    *ppStruct = pStruct;
+  }
+}
+
+static int fts5IndexReturn(Fts5Index *p){
+  int rc = p->rc;
+  p->rc = SQLITE_OK;
+  return rc;
+}
+
+typedef struct Fts5FlushCtx Fts5FlushCtx;
+struct Fts5FlushCtx {
+  Fts5Index *pIdx;
+  Fts5SegWriter writer; 
+};
+
+/*
+** Buffer aBuf[] contains a list of varints, all small enough to fit
+** in a 32-bit integer. Return the size of the largest prefix of this 
+** list nMax bytes or less in size.
+*/
+static int fts5PoslistPrefix(const u8 *aBuf, int nMax){
+  int ret;
+  u32 dummy;
+  ret = fts5GetVarint32(aBuf, dummy);
+  if( ret<nMax ){
+    while( 1 ){
+      int i = fts5GetVarint32(&aBuf[ret], dummy);
+      if( (ret + i) > nMax ) break;
+      ret += i;
+    }
+  }
+  return ret;
+}
+
+/*
+** Execute the SQL statement:
+**
+**    DELETE FROM %_idx WHERE (segid, (pgno/2)) = ($iSegid, $iPgno);
+**
+** This is used when a secure-delete operation removes the last term
+** from a segment leaf page. In that case the %_idx entry is removed 
+** too. This is done to ensure that if all instances of a token are
+** removed from an fts5 database in secure-delete mode, no trace of
+** the token itself remains in the database.
+*/
+static void fts5SecureDeleteIdxEntry(
+  Fts5Index *p,                   /* FTS5 backend object */
+  int iSegid,                     /* Id of segment to delete entry for */
+  int iPgno                       /* Page number within segment */
+){
+  if( iPgno!=1 ){
+    assert( p->pConfig->iVersion==FTS5_CURRENT_VERSION_SECUREDELETE );
+    if( p->pDeleteFromIdx==0 ){
+      fts5IndexPrepareStmt(p, &p->pDeleteFromIdx, sqlite3_mprintf(
+          "DELETE FROM '%q'.'%q_idx' WHERE (segid, (pgno/2)) = (?1, ?2)",
+          p->pConfig->zDb, p->pConfig->zName
+      ));
+    }
+    if( p->rc==SQLITE_OK ){
+      sqlite3_bind_int(p->pDeleteFromIdx, 1, iSegid);
+      sqlite3_bind_int(p->pDeleteFromIdx, 2, iPgno);
+      sqlite3_step(p->pDeleteFromIdx);
+      p->rc = sqlite3_reset(p->pDeleteFromIdx);
+    }
+  }
+}
+
+/*
+** This is called when a secure-delete operation removes a position-list
+** that overflows onto segment page iPgno of segment pSeg. This function
+** rewrites node iPgno, and possibly one or more of its right-hand peers,
+** to remove this portion of the position list.
+**
+** Output variable (*pbLastInDoclist) is set to true if the position-list
+** removed is followed by a new term or the end-of-segment, or false if
+** it is followed by another rowid/position list.
+*/
+static void fts5SecureDeleteOverflow(
+  Fts5Index *p,
+  Fts5StructureSegment *pSeg,
+  int iPgno,
+  int *pbLastInDoclist
+){
+  const int bDetailNone = (p->pConfig->eDetail==FTS5_DETAIL_NONE);
+  int pgno;
+  Fts5Data *pLeaf = 0;
+  assert( iPgno!=1 );
+
+  *pbLastInDoclist = 1;
+  for(pgno=iPgno; p->rc==SQLITE_OK && pgno<=pSeg->pgnoLast; pgno++){
+    i64 iRowid = FTS5_SEGMENT_ROWID(pSeg->iSegid, pgno);
+    int iNext = 0;
+    u8 *aPg = 0;
+
+    pLeaf = fts5DataRead(p, iRowid);
+    if( pLeaf==0 ) break;
+    aPg = pLeaf->p;
+
+    iNext = fts5GetU16(&aPg[0]);
+    if( iNext!=0 ){
+      *pbLastInDoclist = 0;
+    }
+    if( iNext==0 && pLeaf->szLeaf!=pLeaf->nn ){
+      fts5GetVarint32(&aPg[pLeaf->szLeaf], iNext);
+    }
+
+    if( iNext==0 ){
+      /* The page contains no terms or rowids. Replace it with an empty
+      ** page and move on to the right-hand peer.  */
+      const u8 aEmpty[] = {0x00, 0x00, 0x00, 0x04}; 
+      assert_nc( bDetailNone==0 || pLeaf->nn==4 );
+      if( bDetailNone==0 ) fts5DataWrite(p, iRowid, aEmpty, sizeof(aEmpty));
+      fts5DataRelease(pLeaf);
+      pLeaf = 0;
+    }else if( bDetailNone ){
+      break;
+    }else if( iNext>=pLeaf->szLeaf || pLeaf->nn<pLeaf->szLeaf || iNext<4 ){
+      p->rc = FTS5_CORRUPT;
+      break;
+    }else{
+      int nShift = iNext - 4;
+      int nPg;
+
+      int nIdx = 0;
+      u8 *aIdx = 0;
+
+      /* Unless the current page footer is 0 bytes in size (in which case
+      ** the new page footer will be as well), allocate and populate a 
+      ** buffer containing the new page footer. Set stack variables aIdx 
+      ** and nIdx accordingly.  */
+      if( pLeaf->nn>pLeaf->szLeaf ){
+        int iFirst = 0;
+        int i1 = pLeaf->szLeaf;
+        int i2 = 0;
+
+        i1 += fts5GetVarint32(&aPg[i1], iFirst);
+        if( iFirst<iNext ){
+          p->rc = FTS5_CORRUPT;
+          break;
+        }
+        aIdx = sqlite3Fts5MallocZero(&p->rc, (pLeaf->nn-pLeaf->szLeaf)+2);
+        if( aIdx==0 ) break;
+        i2 = sqlite3Fts5PutVarint(aIdx, iFirst-nShift);
+        if( i1<pLeaf->nn ){
+          memcpy(&aIdx[i2], &aPg[i1], pLeaf->nn-i1);
+          i2 += (pLeaf->nn-i1);
+        }
+        nIdx = i2;
+      }
+
+      /* Modify the contents of buffer aPg[]. Set nPg to the new size 
+      ** in bytes. The new page is always smaller than the old.  */
+      nPg = pLeaf->szLeaf - nShift;
+      memmove(&aPg[4], &aPg[4+nShift], nPg-4);
+      fts5PutU16(&aPg[2], nPg);
+      if( fts5GetU16(&aPg[0]) ) fts5PutU16(&aPg[0], 4);
+      if( nIdx>0 ){
+        memcpy(&aPg[nPg], aIdx, nIdx);
+        nPg += nIdx;
+      }
+      sqlite3_free(aIdx);
+
+      /* Write the new page to disk and exit the loop */
+      assert( nPg>4 || fts5GetU16(aPg)==0 );
+      fts5DataWrite(p, iRowid, aPg, nPg);
+      break;
+    }
+  }
+  fts5DataRelease(pLeaf);
+}
+
+/*
+** Completely remove the entry that pSeg currently points to from 
+** the database.
+*/
+static void fts5DoSecureDelete(
+  Fts5Index *p,
+  Fts5SegIter *pSeg
+){
+  const int bDetailNone = (p->pConfig->eDetail==FTS5_DETAIL_NONE);
+  int iSegid = pSeg->pSeg->iSegid;
+  u8 *aPg = pSeg->pLeaf->p;
+  int nPg = pSeg->pLeaf->nn;
+  int iPgIdx = pSeg->pLeaf->szLeaf;
+
+  u64 iDelta = 0;
+  int iNextOff = 0;
+  int iOff = 0;
+  int nIdx = 0;
+  u8 *aIdx = 0;
+  int bLastInDoclist = 0;
+  int iIdx = 0;
+  int iStart = 0;
+  int iDelKeyOff = 0;       /* Offset of deleted key, if any */
+
+  nIdx = nPg-iPgIdx;
+  aIdx = sqlite3Fts5MallocZero(&p->rc, nIdx+16);
+  if( p->rc ) return;
+  memcpy(aIdx, &aPg[iPgIdx], nIdx);
+
+  /* At this point segment iterator pSeg points to the entry
+  ** this function should remove from the b-tree segment. 
+  **
+  ** In detail=full or detail=column mode, pSeg->iLeafOffset is the 
+  ** offset of the first byte in the position-list for the entry to 
+  ** remove. Immediately before this comes two varints that will also
+  ** need to be removed:
+  **
+  **     + the rowid or delta rowid value for the entry, and
+  **     + the size of the position list in bytes.
+  **
+  ** Or, in detail=none mode, there is a single varint prior to 
+  ** pSeg->iLeafOffset - the rowid or delta rowid value.
+  **
+  ** This block sets the following variables:
+  **
+  **   iStart:
+  **     The offset of the first byte of the rowid or delta-rowid
+  **     value for the doclist entry being removed.
+  **
+  **   iDelta:
+  **     The value of the rowid or delta-rowid value for the doclist
+  **     entry being removed.
+  **
+  **   iNextOff:
+  **     The offset of the next entry following the position list
+  **     for the one being removed. If the position list for this
+  **     entry overflows onto the next leaf page, this value will be
+  **     greater than pLeaf->szLeaf.
+  */
+  {
+    int iSOP;                     /* Start-Of-Position-list */
+    if( pSeg->iLeafPgno==pSeg->iTermLeafPgno ){
+      iStart = pSeg->iTermLeafOffset;
+    }else{
+      iStart = fts5GetU16(&aPg[0]);
+    }
+
+    iSOP = iStart + fts5GetVarint(&aPg[iStart], &iDelta);
+    assert_nc( iSOP<=pSeg->iLeafOffset );
+
+    if( bDetailNone ){
+      while( iSOP<pSeg->iLeafOffset ){
+        if( aPg[iSOP]==0x00 ) iSOP++;
+        if( aPg[iSOP]==0x00 ) iSOP++;
+        iStart = iSOP;
+        iSOP = iStart + fts5GetVarint(&aPg[iStart], &iDelta);
+      }
+
+      iNextOff = iSOP;
+      if( iNextOff<pSeg->iEndofDoclist && aPg[iNextOff]==0x00 ) iNextOff++;
+      if( iNextOff<pSeg->iEndofDoclist && aPg[iNextOff]==0x00 ) iNextOff++;
+
+    }else{
+      int nPos = 0;
+      iSOP += fts5GetVarint32(&aPg[iSOP], nPos);
+      while( iSOP<pSeg->iLeafOffset ){
+        iStart = iSOP + (nPos/2);
+        iSOP = iStart + fts5GetVarint(&aPg[iStart], &iDelta);
+        iSOP += fts5GetVarint32(&aPg[iSOP], nPos);
+      }
+      assert_nc( iSOP==pSeg->iLeafOffset );
+      iNextOff = pSeg->iLeafOffset + pSeg->nPos;
+    }
+  }
+
+  iOff = iStart;
+
+  /* If the position-list for the entry being removed flows over past
+  ** the end of this page, delete the portion of the position-list on the
+  ** next page and beyond.
+  **
+  ** Set variable bLastInDoclist to true if this entry happens 
+  ** to be the last rowid in the doclist for its term.  */
+  if( iNextOff>=iPgIdx ){
+    int pgno = pSeg->iLeafPgno+1;
+    fts5SecureDeleteOverflow(p, pSeg->pSeg, pgno, &bLastInDoclist);
+    iNextOff = iPgIdx;
+  }
+
+  if( pSeg->bDel==0 ){
+    if( iNextOff!=iPgIdx ){
+      /* Loop through the page-footer. If iNextOff (offset of the
+      ** entry following the one we are removing) is equal to the 
+      ** offset of a key on this page, then the entry is the last 
+      ** in its doclist. */
+      int iKeyOff = 0;
+      for(iIdx=0; iIdx<nIdx; /* no-op */){
+        u32 iVal = 0;
+        iIdx += fts5GetVarint32(&aIdx[iIdx], iVal);
+        iKeyOff += iVal;
+        if( iKeyOff==iNextOff ){
+          bLastInDoclist = 1;
+        }
+      }
+    }
+
+    /* If this is (a) the first rowid on a page and (b) is not followed by
+    ** another position list on the same page, set the "first-rowid" field
+    ** of the header to 0.  */
+    if( fts5GetU16(&aPg[0])==iStart && (bLastInDoclist || iNextOff==iPgIdx) ){
+      fts5PutU16(&aPg[0], 0);
+    }
+  }
+
+  if( pSeg->bDel ){
+    iOff += sqlite3Fts5PutVarint(&aPg[iOff], iDelta);
+    aPg[iOff++] = 0x01;
+  }else if( bLastInDoclist==0 ){
+    if( iNextOff!=iPgIdx ){
+      u64 iNextDelta = 0;
+      iNextOff += fts5GetVarint(&aPg[iNextOff], &iNextDelta);
+      iOff += sqlite3Fts5PutVarint(&aPg[iOff], iDelta + iNextDelta);
+    }
+  }else if( 
+      pSeg->iLeafPgno==pSeg->iTermLeafPgno 
+   && iStart==pSeg->iTermLeafOffset 
+  ){
+    /* The entry being removed was the only position list in its
+    ** doclist. Therefore the term needs to be removed as well. */
+    int iKey = 0;
+    int iKeyOff = 0;
+
+    /* Set iKeyOff to the offset of the term that will be removed - the
+    ** last offset in the footer that is not greater than iStart. */
+    for(iIdx=0; iIdx<nIdx; iKey++){
+      u32 iVal = 0;
+      iIdx += fts5GetVarint32(&aIdx[iIdx], iVal);
+      if( (iKeyOff+iVal)>(u32)iStart ) break;
+      iKeyOff += iVal;
+    }
+    assert_nc( iKey>=1 );
+
+    /* Set iDelKeyOff to the value of the footer entry to remove from 
+    ** the page. */
+    iDelKeyOff = iOff = iKeyOff;
+
+    if( iNextOff!=iPgIdx ){
+      /* This is the only position-list associated with the term, and there
+      ** is another term following it on this page. So the subsequent term
+      ** needs to be moved to replace the term associated with the entry
+      ** being removed. */
+      int nPrefix = 0;
+      int nSuffix = 0;
+      int nPrefix2 = 0;
+      int nSuffix2 = 0;
+
+      iDelKeyOff = iNextOff;
+      iNextOff += fts5GetVarint32(&aPg[iNextOff], nPrefix2);
+      iNextOff += fts5GetVarint32(&aPg[iNextOff], nSuffix2);
+
+      if( iKey!=1 ){
+        iKeyOff += fts5GetVarint32(&aPg[iKeyOff], nPrefix);
+      }
+      iKeyOff += fts5GetVarint32(&aPg[iKeyOff], nSuffix);
+
+      nPrefix = MIN(nPrefix, nPrefix2);
+      nSuffix = (nPrefix2 + nSuffix2) - nPrefix;
+
+      if( (iKeyOff+nSuffix)>iPgIdx || (iNextOff+nSuffix2)>iPgIdx ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        if( iKey!=1 ){
+          iOff += sqlite3Fts5PutVarint(&aPg[iOff], nPrefix);
+        }
+        iOff += sqlite3Fts5PutVarint(&aPg[iOff], nSuffix);
+        if( nPrefix2>pSeg->term.n ){
+          p->rc = FTS5_CORRUPT;
+        }else if( nPrefix2>nPrefix ){
+          memcpy(&aPg[iOff], &pSeg->term.p[nPrefix], nPrefix2-nPrefix);
+          iOff += (nPrefix2-nPrefix);
+        }
+        memmove(&aPg[iOff], &aPg[iNextOff], nSuffix2);
+        iOff += nSuffix2;
+        iNextOff += nSuffix2;
+      }
+    }
+  }else if( iStart==4 ){
+    int iPgno;
+
+    assert_nc( pSeg->iLeafPgno>pSeg->iTermLeafPgno );
+    /* The entry being removed may be the only position list in
+    ** its doclist. */
+    for(iPgno=pSeg->iLeafPgno-1; iPgno>pSeg->iTermLeafPgno; iPgno-- ){
+      Fts5Data *pPg = fts5DataRead(p, FTS5_SEGMENT_ROWID(iSegid, iPgno));
+      int bEmpty = (pPg && pPg->nn==4);
+      fts5DataRelease(pPg);
+      if( bEmpty==0 ) break;
+    }
+
+    if( iPgno==pSeg->iTermLeafPgno ){
+      i64 iId = FTS5_SEGMENT_ROWID(iSegid, pSeg->iTermLeafPgno);
+      Fts5Data *pTerm = fts5DataRead(p, iId);
+      if( pTerm && pTerm->szLeaf==pSeg->iTermLeafOffset ){
+        u8 *aTermIdx = &pTerm->p[pTerm->szLeaf];
+        int nTermIdx = pTerm->nn - pTerm->szLeaf;
+        int iTermIdx = 0;
+        int iTermOff = 0;
+
+        while( 1 ){
+          u32 iVal = 0;
+          int nByte = fts5GetVarint32(&aTermIdx[iTermIdx], iVal);
+          iTermOff += iVal;
+          if( (iTermIdx+nByte)>=nTermIdx ) break;
+          iTermIdx += nByte;
+        }
+        nTermIdx = iTermIdx;
+
+        memmove(&pTerm->p[iTermOff], &pTerm->p[pTerm->szLeaf], nTermIdx);
+        fts5PutU16(&pTerm->p[2], iTermOff);
+
+        fts5DataWrite(p, iId, pTerm->p, iTermOff+nTermIdx);
+        if( nTermIdx==0 ){
+          fts5SecureDeleteIdxEntry(p, iSegid, pSeg->iTermLeafPgno);
+        }
+      }
+      fts5DataRelease(pTerm);
+    }
+  }
+
+  /* Assuming no error has occurred, this block does final edits to the
+  ** leaf page before writing it back to disk. Input variables are:
+  **
+  **   nPg: Total initial size of leaf page.
+  **   iPgIdx: Initial offset of page footer.
+  **
+  **   iOff: Offset to move data to
+  **   iNextOff: Offset to move data from
+  */
+  if( p->rc==SQLITE_OK ){
+    const int nMove = nPg - iNextOff;     /* Number of bytes to move */
+    int nShift = iNextOff - iOff;         /* Distance to move them */
+
+    int iPrevKeyOut = 0;
+    int iKeyIn = 0;
+
+    memmove(&aPg[iOff], &aPg[iNextOff], nMove);
+    iPgIdx -= nShift;
+    nPg = iPgIdx;
+    fts5PutU16(&aPg[2], iPgIdx);
+
+    for(iIdx=0; iIdx<nIdx; /* no-op */){
+      u32 iVal = 0;
+      iIdx += fts5GetVarint32(&aIdx[iIdx], iVal);
+      iKeyIn += iVal;
+      if( iKeyIn!=iDelKeyOff ){
+        int iKeyOut = (iKeyIn - (iKeyIn>iOff ? nShift : 0));
+        nPg += sqlite3Fts5PutVarint(&aPg[nPg], iKeyOut - iPrevKeyOut);
+        iPrevKeyOut = iKeyOut;
+      }
+    }
+
+    if( iPgIdx==nPg && nIdx>0 && pSeg->iLeafPgno!=1 ){
+      fts5SecureDeleteIdxEntry(p, iSegid, pSeg->iLeafPgno);
+    }
+
+    assert_nc( nPg>4 || fts5GetU16(aPg)==0 );
+    fts5DataWrite(p, FTS5_SEGMENT_ROWID(iSegid,pSeg->iLeafPgno), aPg, nPg);
+  }
+  sqlite3_free(aIdx);
+}
+
+/*
+** This is called as part of flushing a delete to disk in 'secure-delete'
+** mode. It edits the segments within the database described by argument
+** pStruct to remove the entries for term zTerm, rowid iRowid.
+*/
+static void fts5FlushSecureDelete(
+  Fts5Index *p,
+  Fts5Structure *pStruct,
+  const char *zTerm,
+  int nTerm,
+  i64 iRowid
+){
+  const int f = FTS5INDEX_QUERY_SKIPHASH;
+  Fts5Iter *pIter = 0;            /* Used to find term instance */
+
+  fts5MultiIterNew(p, pStruct, f, 0, (const u8*)zTerm, nTerm, -1, 0, &pIter);
+  if( fts5MultiIterEof(p, pIter)==0 ){
+    i64 iThis = fts5MultiIterRowid(pIter);
+    if( iThis<iRowid ){
+      fts5MultiIterNextFrom(p, pIter, iRowid);
+    }
+
+    if( p->rc==SQLITE_OK 
+     && fts5MultiIterEof(p, pIter)==0 
+     && iRowid==fts5MultiIterRowid(pIter)
+    ){
+      Fts5SegIter *pSeg = &pIter->aSeg[pIter->aFirst[1].iFirst];
+      fts5DoSecureDelete(p, pSeg);
+    }
+  }
+
+  fts5MultiIterFree(pIter);
+}
+
+
+/*
+** Flush the contents of in-memory hash table iHash to a new level-0 
+** segment on disk. Also update the corresponding structure record.
+**
+** If an error occurs, set the Fts5Index.rc error code. If an error has 
+** already occurred, this function is a no-op.
+*/
+static void fts5FlushOneHash(Fts5Index *p){
+  Fts5Hash *pHash = p->pHash;
+  Fts5Structure *pStruct;
+  int iSegid;
+  int pgnoLast = 0;                 /* Last leaf page number in segment */
+
+  /* Obtain a reference to the index structure and allocate a new segment-id
+  ** for the new level-0 segment.  */
+  pStruct = fts5StructureRead(p);
+  fts5StructureInvalidate(p);
+
+  if( sqlite3Fts5HashIsEmpty(pHash)==0 ){
+    iSegid = fts5AllocateSegid(p, pStruct);
+    if( iSegid ){
+      const int pgsz = p->pConfig->pgsz;
+      int eDetail = p->pConfig->eDetail;
+      int bSecureDelete = p->pConfig->bSecureDelete;
+      Fts5StructureSegment *pSeg; /* New segment within pStruct */
+      Fts5Buffer *pBuf;           /* Buffer in which to assemble leaf page */
+      Fts5Buffer *pPgidx;         /* Buffer in which to assemble pgidx */
+  
+      Fts5SegWriter writer;
+      fts5WriteInit(p, &writer, iSegid);
+  
+      pBuf = &writer.writer.buf;
+      pPgidx = &writer.writer.pgidx;
+  
+      /* fts5WriteInit() should have initialized the buffers to (most likely)
+      ** the maximum space required. */
+      assert( p->rc || pBuf->nSpace>=(pgsz + FTS5_DATA_PADDING) );
+      assert( p->rc || pPgidx->nSpace>=(pgsz + FTS5_DATA_PADDING) );
+  
+      /* Begin scanning through hash table entries. This loop runs once for each
+      ** term/doclist currently stored within the hash table. */
+      if( p->rc==SQLITE_OK ){
+        p->rc = sqlite3Fts5HashScanInit(pHash, 0, 0);
+      }
+      while( p->rc==SQLITE_OK && 0==sqlite3Fts5HashScanEof(pHash) ){
+        const char *zTerm;        /* Buffer containing term */
+        int nTerm;                /* Size of zTerm in bytes */
+        const u8 *pDoclist;       /* Pointer to doclist for this term */
+        int nDoclist;             /* Size of doclist in bytes */
+  
+        /* Get the term and doclist for this entry. */
+        sqlite3Fts5HashScanEntry(pHash, &zTerm, &nTerm, &pDoclist, &nDoclist);
+        if( bSecureDelete==0 ){
+          fts5WriteAppendTerm(p, &writer, nTerm, (const u8*)zTerm);
+          if( p->rc!=SQLITE_OK ) break;
+          assert( writer.bFirstRowidInPage==0 );
+        }
+  
+        if( !bSecureDelete && pgsz>=(pBuf->n + pPgidx->n + nDoclist + 1) ){
+          /* The entire doclist will fit on the current leaf. */
+          fts5BufferSafeAppendBlob(pBuf, pDoclist, nDoclist);
+        }else{
+          int bTermWritten = !bSecureDelete;
+          i64 iRowid = 0;
+          i64 iPrev = 0;
+          int iOff = 0;
+  
+          /* The entire doclist will not fit on this leaf. The following 
+          ** loop iterates through the poslists that make up the current 
+          ** doclist.  */
+          while( p->rc==SQLITE_OK && iOff<nDoclist ){
+            u64 iDelta = 0;
+            iOff += fts5GetVarint(&pDoclist[iOff], &iDelta);
+            iRowid += iDelta;
+  
+            /* If in secure delete mode, and if this entry in the poslist is
+            ** in fact a delete, then edit the existing segments directly
+            ** using fts5FlushSecureDelete().  */
+            if( bSecureDelete ){
+              if( eDetail==FTS5_DETAIL_NONE ){
+                if( iOff<nDoclist && pDoclist[iOff]==0x00 ){
+                  fts5FlushSecureDelete(p, pStruct, zTerm, nTerm, iRowid);
+                  iOff++;
+                  if( iOff<nDoclist && pDoclist[iOff]==0x00 ){
+                    iOff++;
+                    nDoclist = 0;
+                  }else{
+                    continue;
+                  }
+                }
+              }else if( (pDoclist[iOff] & 0x01) ){
+                fts5FlushSecureDelete(p, pStruct, zTerm, nTerm, iRowid);
+                if( p->rc!=SQLITE_OK || pDoclist[iOff]==0x01 ){
+                  iOff++;
+                  continue;
+                }
+              }
+            }
+  
+            if( p->rc==SQLITE_OK && bTermWritten==0 ){
+              fts5WriteAppendTerm(p, &writer, nTerm, (const u8*)zTerm);
+              bTermWritten = 1;
+              assert( p->rc!=SQLITE_OK || writer.bFirstRowidInPage==0 );
+            }
+            
+            if( writer.bFirstRowidInPage ){
+              fts5PutU16(&pBuf->p[0], (u16)pBuf->n);   /* first rowid on page */
+              pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iRowid);
+              writer.bFirstRowidInPage = 0;
+              fts5WriteDlidxAppend(p, &writer, iRowid);
+            }else{
+              u64 iRowidDelta = (u64)iRowid - (u64)iPrev;
+              pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iRowidDelta);
+            }
+            if( p->rc!=SQLITE_OK ) break;
+            assert( pBuf->n<=pBuf->nSpace );
+            iPrev = iRowid;
+  
+            if( eDetail==FTS5_DETAIL_NONE ){
+              if( iOff<nDoclist && pDoclist[iOff]==0 ){
+                pBuf->p[pBuf->n++] = 0;
+                iOff++;
+                if( iOff<nDoclist && pDoclist[iOff]==0 ){
+                  pBuf->p[pBuf->n++] = 0;
+                  iOff++;
+                }
+              }
+              if( (pBuf->n + pPgidx->n)>=pgsz ){
+                fts5WriteFlushLeaf(p, &writer);
+              }
+            }else{
+              int bDel = 0;
+              int nPos = 0;
+              int nCopy = fts5GetPoslistSize(&pDoclist[iOff], &nPos, &bDel);
+              if( bDel && bSecureDelete ){
+                fts5BufferAppendVarint(&p->rc, pBuf, nPos*2);
+                iOff += nCopy;
+                nCopy = nPos;
+              }else{
+                nCopy += nPos;
+              }
+              if( (pBuf->n + pPgidx->n + nCopy) <= pgsz ){
+                /* The entire poslist will fit on the current leaf. So copy
+                ** it in one go. */
+                fts5BufferSafeAppendBlob(pBuf, &pDoclist[iOff], nCopy);
+              }else{
+                /* The entire poslist will not fit on this leaf. So it needs
+                ** to be broken into sections. The only qualification being
+                ** that each varint must be stored contiguously.  */
+                const u8 *pPoslist = &pDoclist[iOff];
+                int iPos = 0;
+                while( p->rc==SQLITE_OK ){
+                  int nSpace = pgsz - pBuf->n - pPgidx->n;
+                  int n = 0;
+                  if( (nCopy - iPos)<=nSpace ){
+                    n = nCopy - iPos;
+                  }else{
+                    n = fts5PoslistPrefix(&pPoslist[iPos], nSpace);
+                  }
+                  assert( n>0 );
+                  fts5BufferSafeAppendBlob(pBuf, &pPoslist[iPos], n);
+                  iPos += n;
+                  if( (pBuf->n + pPgidx->n)>=pgsz ){
+                    fts5WriteFlushLeaf(p, &writer);
+                  }
+                  if( iPos>=nCopy ) break;
+                }
+              }
+              iOff += nCopy;
+            }
+          }
+        }
+  
+        /* TODO2: Doclist terminator written here. */
+        /* pBuf->p[pBuf->n++] = '\0'; */
+        assert( pBuf->n<=pBuf->nSpace );
+        if( p->rc==SQLITE_OK ) sqlite3Fts5HashScanNext(pHash);
+      }
+      fts5WriteFinish(p, &writer, &pgnoLast);
+  
+      assert( p->rc!=SQLITE_OK || bSecureDelete || pgnoLast>0 );
+      if( pgnoLast>0 ){
+        /* Update the Fts5Structure. It is written back to the database by the
+        ** fts5StructureRelease() call below.  */
+        if( pStruct->nLevel==0 ){
+          fts5StructureAddLevel(&p->rc, &pStruct);
+        }
+        fts5StructureExtendLevel(&p->rc, pStruct, 0, 1, 0);
+        if( p->rc==SQLITE_OK ){
+          pSeg = &pStruct->aLevel[0].aSeg[ pStruct->aLevel[0].nSeg++ ];
+          pSeg->iSegid = iSegid;
+          pSeg->pgnoFirst = 1;
+          pSeg->pgnoLast = pgnoLast;
+          if( pStruct->nOriginCntr>0 ){
+            pSeg->iOrigin1 = pStruct->nOriginCntr;
+            pSeg->iOrigin2 = pStruct->nOriginCntr;
+            pSeg->nEntry = p->nPendingRow;
+            pStruct->nOriginCntr++;
+          }
+          pStruct->nSegment++;
+        }
+        fts5StructurePromote(p, 0, pStruct);
+      }
+    }
+  }
+
+  fts5IndexAutomerge(p, &pStruct, pgnoLast + p->nContentlessDelete);
+  fts5IndexCrisismerge(p, &pStruct);
+  fts5StructureWrite(p, pStruct);
+  fts5StructureRelease(pStruct);
+}
+
+/*
+** Flush any data stored in the in-memory hash tables to the database.
+*/
+static void fts5IndexFlush(Fts5Index *p){
+  /* Unless it is empty, flush the hash table to disk */
+  if( p->flushRc ){
+    p->rc = p->flushRc;
+    return;
+  }
+  if( p->nPendingData || p->nContentlessDelete ){
+    assert( p->pHash );
+    fts5FlushOneHash(p);
+    if( p->rc==SQLITE_OK ){
+      sqlite3Fts5HashClear(p->pHash);
+      p->nPendingData = 0;
+      p->nPendingRow = 0;
+      p->nContentlessDelete = 0;
+    }else if( p->nPendingData || p->nContentlessDelete ){
+      p->flushRc = p->rc;
+    }
+  }
+}
+
+static Fts5Structure *fts5IndexOptimizeStruct(
+  Fts5Index *p, 
+  Fts5Structure *pStruct
+){
+  Fts5Structure *pNew = 0;
+  sqlite3_int64 nByte = sizeof(Fts5Structure);
+  int nSeg = pStruct->nSegment;
+  int i;
+
+  /* Figure out if this structure requires optimization. A structure does
+  ** not require optimization if either:
+  **
+  **  1. it consists of fewer than two segments, or 
+  **  2. all segments are on the same level, or
+  **  3. all segments except one are currently inputs to a merge operation.
+  **
+  ** In the first case, if there are no tombstone hash pages, return NULL. In
+  ** the second, increment the ref-count on *pStruct and return a copy of the
+  ** pointer to it.
+  */
+  if( nSeg==0 ) return 0;
+  for(i=0; i<pStruct->nLevel; i++){
+    int nThis = pStruct->aLevel[i].nSeg;
+    int nMerge = pStruct->aLevel[i].nMerge;
+    if( nThis>0 && (nThis==nSeg || (nThis==nSeg-1 && nMerge==nThis)) ){
+      if( nSeg==1 && nThis==1 && pStruct->aLevel[i].aSeg[0].nPgTombstone==0 ){
+        return 0;
+      }
+      fts5StructureRef(pStruct);
+      return pStruct;
+    }
+    assert( pStruct->aLevel[i].nMerge<=nThis );
+  }
+
+  nByte += (pStruct->nLevel+1) * sizeof(Fts5StructureLevel);
+  pNew = (Fts5Structure*)sqlite3Fts5MallocZero(&p->rc, nByte);
+
+  if( pNew ){
+    Fts5StructureLevel *pLvl;
+    nByte = nSeg * sizeof(Fts5StructureSegment);
+    pNew->nLevel = MIN(pStruct->nLevel+1, FTS5_MAX_LEVEL);
+    pNew->nRef = 1;
+    pNew->nWriteCounter = pStruct->nWriteCounter;
+    pNew->nOriginCntr = pStruct->nOriginCntr;
+    pLvl = &pNew->aLevel[pNew->nLevel-1];
+    pLvl->aSeg = (Fts5StructureSegment*)sqlite3Fts5MallocZero(&p->rc, nByte);
+    if( pLvl->aSeg ){
+      int iLvl, iSeg;
+      int iSegOut = 0;
+      /* Iterate through all segments, from oldest to newest. Add them to
+      ** the new Fts5Level object so that pLvl->aSeg[0] is the oldest
+      ** segment in the data structure.  */
+      for(iLvl=pStruct->nLevel-1; iLvl>=0; iLvl--){
+        for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+          pLvl->aSeg[iSegOut] = pStruct->aLevel[iLvl].aSeg[iSeg];
+          iSegOut++;
+        }
+      }
+      pNew->nSegment = pLvl->nSeg = nSeg;
+    }else{
+      sqlite3_free(pNew);
+      pNew = 0;
+    }
+  }
+
+  return pNew;
+}
+
+static int sqlite3Fts5IndexOptimize(Fts5Index *p){
+  Fts5Structure *pStruct;
+  Fts5Structure *pNew = 0;
+
+  assert( p->rc==SQLITE_OK );
+  fts5IndexFlush(p);
+  assert( p->rc!=SQLITE_OK || p->nContentlessDelete==0 );
+  pStruct = fts5StructureRead(p);
+  assert( p->rc!=SQLITE_OK || pStruct!=0 );
+  fts5StructureInvalidate(p);
+
+  if( pStruct ){
+    pNew = fts5IndexOptimizeStruct(p, pStruct);
+  }
+  fts5StructureRelease(pStruct);
+
+  assert( pNew==0 || pNew->nSegment>0 );
+  if( pNew ){
+    int iLvl;
+    for(iLvl=0; pNew->aLevel[iLvl].nSeg==0; iLvl++){}
+    while( p->rc==SQLITE_OK && pNew->aLevel[iLvl].nSeg>0 ){
+      int nRem = FTS5_OPT_WORK_UNIT;
+      fts5IndexMergeLevel(p, &pNew, iLvl, &nRem);
+    }
+
+    fts5StructureWrite(p, pNew);
+    fts5StructureRelease(pNew);
+  }
+
+  return fts5IndexReturn(p); 
+}
+
+/*
+** This is called to implement the special "VALUES('merge', $nMerge)"
+** INSERT command.
+*/
+static int sqlite3Fts5IndexMerge(Fts5Index *p, int nMerge){
+  Fts5Structure *pStruct = 0;
+
+  fts5IndexFlush(p);
+  pStruct = fts5StructureRead(p);
+  if( pStruct ){
+    int nMin = p->pConfig->nUsermerge;
+    fts5StructureInvalidate(p);
+    if( nMerge<0 ){
+      Fts5Structure *pNew = fts5IndexOptimizeStruct(p, pStruct);
+      fts5StructureRelease(pStruct);
+      pStruct = pNew;
+      nMin = 1;
+      nMerge = nMerge*-1;
+    }
+    if( pStruct && pStruct->nLevel ){
+      if( fts5IndexMerge(p, &pStruct, nMerge, nMin) ){
+        fts5StructureWrite(p, pStruct);
+      }
+    }
+    fts5StructureRelease(pStruct);
+  }
+  return fts5IndexReturn(p);
+}
+
+static void fts5AppendRowid(
+  Fts5Index *p,
+  u64 iDelta,
+  Fts5Iter *pUnused,
+  Fts5Buffer *pBuf
+){
+  UNUSED_PARAM(pUnused);
+  fts5BufferAppendVarint(&p->rc, pBuf, iDelta);
+}
+
+static void fts5AppendPoslist(
+  Fts5Index *p,
+  u64 iDelta,
+  Fts5Iter *pMulti,
+  Fts5Buffer *pBuf
+){
+  int nData = pMulti->base.nData;
+  int nByte = nData + 9 + 9 + FTS5_DATA_ZERO_PADDING;
+  assert( nData>0 );
+  if( p->rc==SQLITE_OK && 0==fts5BufferGrow(&p->rc, pBuf, nByte) ){
+    fts5BufferSafeAppendVarint(pBuf, iDelta);
+    fts5BufferSafeAppendVarint(pBuf, nData*2);
+    fts5BufferSafeAppendBlob(pBuf, pMulti->base.pData, nData);
+    memset(&pBuf->p[pBuf->n], 0, FTS5_DATA_ZERO_PADDING);
+  }
+}
+
+
+static void fts5DoclistIterNext(Fts5DoclistIter *pIter){
+  u8 *p = pIter->aPoslist + pIter->nSize + pIter->nPoslist;
+
+  assert( pIter->aPoslist || (p==0 && pIter->aPoslist==0) );
+  if( p>=pIter->aEof ){
+    pIter->aPoslist = 0;
+  }else{
+    i64 iDelta;
+
+    p += fts5GetVarint(p, (u64*)&iDelta);
+    pIter->iRowid += iDelta;
+
+    /* Read position list size */
+    if( p[0] & 0x80 ){
+      int nPos;
+      pIter->nSize = fts5GetVarint32(p, nPos);
+      pIter->nPoslist = (nPos>>1);
+    }else{
+      pIter->nPoslist = ((int)(p[0])) >> 1;
+      pIter->nSize = 1;
+    }
+
+    pIter->aPoslist = p;
+    if( &pIter->aPoslist[pIter->nPoslist]>pIter->aEof ){
+      pIter->aPoslist = 0;
+    }
+  }
+}
+
+static void fts5DoclistIterInit(
+  Fts5Buffer *pBuf, 
+  Fts5DoclistIter *pIter
+){
+  memset(pIter, 0, sizeof(*pIter));
+  if( pBuf->n>0 ){
+    pIter->aPoslist = pBuf->p;
+    pIter->aEof = &pBuf->p[pBuf->n];
+    fts5DoclistIterNext(pIter);
+  }
+}
+
+#if 0
+/*
+** Append a doclist to buffer pBuf.
+**
+** This function assumes that space within the buffer has already been
+** allocated.
+*/
+static void fts5MergeAppendDocid(
+  Fts5Buffer *pBuf,               /* Buffer to write to */
+  i64 *piLastRowid,               /* IN/OUT: Previous rowid written (if any) */
+  i64 iRowid                      /* Rowid to append */
+){
+  assert( pBuf->n!=0 || (*piLastRowid)==0 );
+  fts5BufferSafeAppendVarint(pBuf, iRowid - *piLastRowid);
+  *piLastRowid = iRowid;
+}
+#endif
+
+#define fts5MergeAppendDocid(pBuf, iLastRowid, iRowid) {                 \
+  assert( (pBuf)->n!=0 || (iLastRowid)==0 );                             \
+  fts5BufferSafeAppendVarint((pBuf), (u64)(iRowid) - (u64)(iLastRowid)); \
+  (iLastRowid) = (iRowid);                                               \
+}
+
+/*
+** Swap the contents of buffer *p1 with that of *p2.
+*/
+static void fts5BufferSwap(Fts5Buffer *p1, Fts5Buffer *p2){
+  Fts5Buffer tmp = *p1;
+  *p1 = *p2;
+  *p2 = tmp;
+}
+
+static void fts5NextRowid(Fts5Buffer *pBuf, int *piOff, i64 *piRowid){
+  int i = *piOff;
+  if( i>=pBuf->n ){
+    *piOff = -1;
+  }else{
+    u64 iVal;
+    *piOff = i + sqlite3Fts5GetVarint(&pBuf->p[i], &iVal);
+    *piRowid += iVal;
+  }
+}
+
+/*
+** This is the equivalent of fts5MergePrefixLists() for detail=none mode.
+** In this case the buffers consist of a delta-encoded list of rowids only.
+*/
+static void fts5MergeRowidLists(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Buffer *p1,                 /* First list to merge */
+  int nBuf,                       /* Number of entries in apBuf[] */
+  Fts5Buffer *aBuf                /* Array of other lists to merge into p1 */
+){
+  int i1 = 0;
+  int i2 = 0;
+  i64 iRowid1 = 0;
+  i64 iRowid2 = 0;
+  i64 iOut = 0;
+  Fts5Buffer *p2 = &aBuf[0];
+  Fts5Buffer out;
+
+  (void)nBuf;
+  memset(&out, 0, sizeof(out));
+  assert( nBuf==1 );
+  sqlite3Fts5BufferSize(&p->rc, &out, p1->n + p2->n);
+  if( p->rc ) return;
+
+  fts5NextRowid(p1, &i1, &iRowid1);
+  fts5NextRowid(p2, &i2, &iRowid2);
+  while( i1>=0 || i2>=0 ){
+    if( i1>=0 && (i2<0 || iRowid1<iRowid2) ){
+      assert( iOut==0 || iRowid1>iOut );
+      fts5BufferSafeAppendVarint(&out, iRowid1 - iOut);
+      iOut = iRowid1;
+      fts5NextRowid(p1, &i1, &iRowid1);
+    }else{
+      assert( iOut==0 || iRowid2>iOut );
+      fts5BufferSafeAppendVarint(&out, iRowid2 - iOut);
+      iOut = iRowid2;
+      if( i1>=0 && iRowid1==iRowid2 ){
+        fts5NextRowid(p1, &i1, &iRowid1);
+      }
+      fts5NextRowid(p2, &i2, &iRowid2);
+    }
+  }
+
+  fts5BufferSwap(&out, p1);
+  fts5BufferFree(&out);
+}
+
+typedef struct PrefixMerger PrefixMerger;
+struct PrefixMerger {
+  Fts5DoclistIter iter;           /* Doclist iterator */
+  i64 iPos;                       /* For iterating through a position list */
+  int iOff;
+  u8 *aPos;
+  PrefixMerger *pNext;            /* Next in docid/poslist order */
+};
+
+static void fts5PrefixMergerInsertByRowid(
+  PrefixMerger **ppHead, 
+  PrefixMerger *p
+){
+  if( p->iter.aPoslist ){
+    PrefixMerger **pp = ppHead;
+    while( *pp && p->iter.iRowid>(*pp)->iter.iRowid ){
+      pp = &(*pp)->pNext;
+    }
+    p->pNext = *pp;
+    *pp = p;
+  }
+}
+
+static void fts5PrefixMergerInsertByPosition(
+  PrefixMerger **ppHead, 
+  PrefixMerger *p
+){
+  if( p->iPos>=0 ){
+    PrefixMerger **pp = ppHead;
+    while( *pp && p->iPos>(*pp)->iPos ){
+      pp = &(*pp)->pNext;
+    }
+    p->pNext = *pp;
+    *pp = p;
+  }
+}
+
+
+/*
+** Array aBuf[] contains nBuf doclists. These are all merged in with the
+** doclist in buffer p1.
+*/
+static void fts5MergePrefixLists(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Buffer *p1,                 /* First list to merge */
+  int nBuf,                       /* Number of buffers in array aBuf[] */
+  Fts5Buffer *aBuf                /* Other lists to merge in */ 
+){
+#define fts5PrefixMergerNextPosition(p) \
+  sqlite3Fts5PoslistNext64((p)->aPos,(p)->iter.nPoslist,&(p)->iOff,&(p)->iPos)
+#define FTS5_MERGE_NLIST 16
+  PrefixMerger aMerger[FTS5_MERGE_NLIST];
+  PrefixMerger *pHead = 0;
+  int i;
+  int nOut = 0;
+  Fts5Buffer out = {0, 0, 0};
+  Fts5Buffer tmp = {0, 0, 0};
+  i64 iLastRowid = 0;
+
+  /* Initialize a doclist-iterator for each input buffer. Arrange them in
+  ** a linked-list starting at pHead in ascending order of rowid. Avoid
+  ** linking any iterators already at EOF into the linked list at all. */ 
+  assert( nBuf+1<=(int)(sizeof(aMerger)/sizeof(aMerger[0])) );
+  memset(aMerger, 0, sizeof(PrefixMerger)*(nBuf+1));
+  pHead = &aMerger[nBuf];
+  fts5DoclistIterInit(p1, &pHead->iter);
+  for(i=0; i<nBuf; i++){
+    fts5DoclistIterInit(&aBuf[i], &aMerger[i].iter);
+    fts5PrefixMergerInsertByRowid(&pHead, &aMerger[i]);
+    nOut += aBuf[i].n;
+  }
+  if( nOut==0 ) return;
+  nOut += p1->n + 9 + 10*nBuf;
+
+  /* The maximum size of the output is equal to the sum of the
+  ** input sizes + 1 varint (9 bytes). The extra varint is because if the
+  ** first rowid in one input is a large negative number, and the first in
+  ** the other a non-negative number, the delta for the non-negative
+  ** number will be larger on disk than the literal integer value
+  ** was.  
+  **
+  ** Or, if the input position-lists are corrupt, then the output might
+  ** include up to (nBuf+1) extra 10-byte positions created by interpreting -1
+  ** (the value PoslistNext64() uses for EOF) as a position and appending
+  ** it to the output. This can happen at most once for each input 
+  ** position-list, hence (nBuf+1) 10 byte paddings.  */
+  if( sqlite3Fts5BufferSize(&p->rc, &out, nOut) ) return;
+
+  while( pHead ){
+    fts5MergeAppendDocid(&out, iLastRowid, pHead->iter.iRowid);
+
+    if( pHead->pNext && iLastRowid==pHead->pNext->iter.iRowid ){
+      /* Merge data from two or more poslists */
+      i64 iPrev = 0;
+      int nTmp = FTS5_DATA_ZERO_PADDING;
+      int nMerge = 0;
+      PrefixMerger *pSave = pHead;
+      PrefixMerger *pThis = 0;
+      int nTail = 0;
+
+      pHead = 0;
+      while( pSave && pSave->iter.iRowid==iLastRowid ){
+        PrefixMerger *pNext = pSave->pNext;
+        pSave->iOff = 0;
+        pSave->iPos = 0;
+        pSave->aPos = &pSave->iter.aPoslist[pSave->iter.nSize];
+        fts5PrefixMergerNextPosition(pSave);
+        nTmp += pSave->iter.nPoslist + 10;
+        nMerge++;
+        fts5PrefixMergerInsertByPosition(&pHead, pSave);
+        pSave = pNext;
+      }
+
+      if( pHead==0 || pHead->pNext==0 ){
+        p->rc = FTS5_CORRUPT;
+        break;
+      }
+
+      /* See the earlier comment in this function for an explanation of why
+      ** corrupt input position lists might cause the output to consume
+      ** at most nMerge*10 bytes of unexpected space. */
+      if( sqlite3Fts5BufferSize(&p->rc, &tmp, nTmp+nMerge*10) ){
+        break;
+      }
+      fts5BufferZero(&tmp);
+
+      pThis = pHead;
+      pHead = pThis->pNext;
+      sqlite3Fts5PoslistSafeAppend(&tmp, &iPrev, pThis->iPos);
+      fts5PrefixMergerNextPosition(pThis);
+      fts5PrefixMergerInsertByPosition(&pHead, pThis);
+
+      while( pHead->pNext ){
+        pThis = pHead;
+        if( pThis->iPos!=iPrev ){
+          sqlite3Fts5PoslistSafeAppend(&tmp, &iPrev, pThis->iPos);
+        }
+        fts5PrefixMergerNextPosition(pThis);
+        pHead = pThis->pNext;
+        fts5PrefixMergerInsertByPosition(&pHead, pThis);
+      }
+
+      if( pHead->iPos!=iPrev ){
+        sqlite3Fts5PoslistSafeAppend(&tmp, &iPrev, pHead->iPos);
+      }
+      nTail = pHead->iter.nPoslist - pHead->iOff;
+
+      /* WRITEPOSLISTSIZE */
+      assert_nc( tmp.n+nTail<=nTmp );
+      assert( tmp.n+nTail<=nTmp+nMerge*10 );
+      if( tmp.n+nTail>nTmp-FTS5_DATA_ZERO_PADDING ){
+        if( p->rc==SQLITE_OK ) p->rc = FTS5_CORRUPT;
+        break;
+      }
+      fts5BufferSafeAppendVarint(&out, (tmp.n+nTail) * 2);
+      fts5BufferSafeAppendBlob(&out, tmp.p, tmp.n);
+      if( nTail>0 ){
+        fts5BufferSafeAppendBlob(&out, &pHead->aPos[pHead->iOff], nTail);
+      }
+
+      pHead = pSave;
+      for(i=0; i<nBuf+1; i++){
+        PrefixMerger *pX = &aMerger[i];
+        if( pX->iter.aPoslist && pX->iter.iRowid==iLastRowid ){
+          fts5DoclistIterNext(&pX->iter);
+          fts5PrefixMergerInsertByRowid(&pHead, pX);
+        }
+      }
+
+    }else{
+      /* Copy poslist from pHead to output */
+      PrefixMerger *pThis = pHead;
+      Fts5DoclistIter *pI = &pThis->iter;
+      fts5BufferSafeAppendBlob(&out, pI->aPoslist, pI->nPoslist+pI->nSize);
+      fts5DoclistIterNext(pI);
+      pHead = pThis->pNext;
+      fts5PrefixMergerInsertByRowid(&pHead, pThis);
+    }
+  }
+
+  fts5BufferFree(p1);
+  fts5BufferFree(&tmp);
+  memset(&out.p[out.n], 0, FTS5_DATA_ZERO_PADDING);
+  *p1 = out;
+}
+
+static void fts5SetupPrefixIter(
+  Fts5Index *p,                   /* Index to read from */
+  int bDesc,                      /* True for "ORDER BY rowid DESC" */
+  int iIdx,                       /* Index to scan for data */
+  u8 *pToken,                     /* Buffer containing prefix to match */
+  int nToken,                     /* Size of buffer pToken in bytes */
+  Fts5Colset *pColset,            /* Restrict matches to these columns */
+  Fts5Iter **ppIter               /* OUT: New iterator */
+){
+  Fts5Structure *pStruct;
+  Fts5Buffer *aBuf;
+  int nBuf = 32;
+  int nMerge = 1;
+
+  void (*xMerge)(Fts5Index*, Fts5Buffer*, int, Fts5Buffer*);
+  void (*xAppend)(Fts5Index*, u64, Fts5Iter*, Fts5Buffer*);
+  if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
+    xMerge = fts5MergeRowidLists;
+    xAppend = fts5AppendRowid;
+  }else{
+    nMerge = FTS5_MERGE_NLIST-1;
+    nBuf = nMerge*8;   /* Sufficient to merge (16^8)==(2^32) lists */
+    xMerge = fts5MergePrefixLists;
+    xAppend = fts5AppendPoslist;
+  }
+
+  aBuf = (Fts5Buffer*)fts5IdxMalloc(p, sizeof(Fts5Buffer)*nBuf);
+  pStruct = fts5StructureRead(p);
+  assert( p->rc!=SQLITE_OK || (aBuf && pStruct) );
+
+  if( p->rc==SQLITE_OK ){
+    const int flags = FTS5INDEX_QUERY_SCAN 
+                    | FTS5INDEX_QUERY_SKIPEMPTY 
+                    | FTS5INDEX_QUERY_NOOUTPUT;
+    int i;
+    i64 iLastRowid = 0;
+    Fts5Iter *p1 = 0;     /* Iterator used to gather data from index */
+    Fts5Data *pData;
+    Fts5Buffer doclist;
+    int bNewTerm = 1;
+
+    memset(&doclist, 0, sizeof(doclist));
+
+    /* If iIdx is non-zero, then it is the number of a prefix-index for
+    ** prefixes 1 character longer than the prefix being queried for. That
+    ** index contains all the doclists required, except for the one
+    ** corresponding to the prefix itself. That one is extracted from the
+    ** main term index here.  */
+    if( iIdx!=0 ){
+      int dummy = 0;
+      const int f2 = FTS5INDEX_QUERY_SKIPEMPTY|FTS5INDEX_QUERY_NOOUTPUT;
+      pToken[0] = FTS5_MAIN_PREFIX;
+      fts5MultiIterNew(p, pStruct, f2, pColset, pToken, nToken, -1, 0, &p1);
+      fts5IterSetOutputCb(&p->rc, p1);
+      for(;
+        fts5MultiIterEof(p, p1)==0;
+        fts5MultiIterNext2(p, p1, &dummy)
+      ){
+        Fts5SegIter *pSeg = &p1->aSeg[ p1->aFirst[1].iFirst ];
+        p1->xSetOutputs(p1, pSeg);
+        if( p1->base.nData ){
+          xAppend(p, (u64)p1->base.iRowid-(u64)iLastRowid, p1, &doclist);
+          iLastRowid = p1->base.iRowid;
+        }
+      }
+      fts5MultiIterFree(p1);
+    }
+
+    pToken[0] = FTS5_MAIN_PREFIX + iIdx;
+    fts5MultiIterNew(p, pStruct, flags, pColset, pToken, nToken, -1, 0, &p1);
+    fts5IterSetOutputCb(&p->rc, p1);
+
+    for( /* no-op */ ;
+        fts5MultiIterEof(p, p1)==0;
+        fts5MultiIterNext2(p, p1, &bNewTerm)
+    ){
+      Fts5SegIter *pSeg = &p1->aSeg[ p1->aFirst[1].iFirst ];
+      int nTerm = pSeg->term.n;
+      const u8 *pTerm = pSeg->term.p;
+      p1->xSetOutputs(p1, pSeg);
+
+      assert_nc( memcmp(pToken, pTerm, MIN(nToken, nTerm))<=0 );
+      if( bNewTerm ){
+        if( nTerm<nToken || memcmp(pToken, pTerm, nToken) ) break;
+      }
+
+      if( p1->base.nData==0 ) continue;
+      if( p1->base.iRowid<=iLastRowid && doclist.n>0 ){
+        for(i=0; p->rc==SQLITE_OK && doclist.n; i++){
+          int i1 = i*nMerge;
+          int iStore;
+          assert( i1+nMerge<=nBuf );
+          for(iStore=i1; iStore<i1+nMerge; iStore++){
+            if( aBuf[iStore].n==0 ){
+              fts5BufferSwap(&doclist, &aBuf[iStore]);
+              fts5BufferZero(&doclist);
+              break;
+            }
+          }
+          if( iStore==i1+nMerge ){
+            xMerge(p, &doclist, nMerge, &aBuf[i1]);
+            for(iStore=i1; iStore<i1+nMerge; iStore++){
+              fts5BufferZero(&aBuf[iStore]);
+            }
+          }
+        }
+        iLastRowid = 0;
+      }
+
+      xAppend(p, (u64)p1->base.iRowid-(u64)iLastRowid, p1, &doclist);
+      iLastRowid = p1->base.iRowid;
+    }
+
+    assert( (nBuf%nMerge)==0 );
+    for(i=0; i<nBuf; i+=nMerge){
+      int iFree;
+      if( p->rc==SQLITE_OK ){
+        xMerge(p, &doclist, nMerge, &aBuf[i]);
+      }
+      for(iFree=i; iFree<i+nMerge; iFree++){
+        fts5BufferFree(&aBuf[iFree]);
+      }
+    }
+    fts5MultiIterFree(p1);
+
+    pData = fts5IdxMalloc(p, sizeof(*pData)+doclist.n+FTS5_DATA_ZERO_PADDING);
+    if( pData ){
+      pData->p = (u8*)&pData[1];
+      pData->nn = pData->szLeaf = doclist.n;
+      if( doclist.n ) memcpy(pData->p, doclist.p, doclist.n);
+      fts5MultiIterNew2(p, pData, bDesc, ppIter);
+    }
+    fts5BufferFree(&doclist);
+  }
+
+  fts5StructureRelease(pStruct);
+  sqlite3_free(aBuf);
+}
+
+
+/*
+** Indicate that all subsequent calls to sqlite3Fts5IndexWrite() pertain
+** to the document with rowid iRowid.
+*/
+static int sqlite3Fts5IndexBeginWrite(Fts5Index *p, int bDelete, i64 iRowid){
+  assert( p->rc==SQLITE_OK );
+
+  /* Allocate the hash table if it has not already been allocated */
+  if( p->pHash==0 ){
+    p->rc = sqlite3Fts5HashNew(p->pConfig, &p->pHash, &p->nPendingData);
+  }
+
+  /* Flush the hash table to disk if required */
+  if( iRowid<p->iWriteRowid 
+   || (iRowid==p->iWriteRowid && p->bDelete==0)
+   || (p->nPendingData > p->pConfig->nHashSize)
+  ){
+    fts5IndexFlush(p);
+  }
+
+  p->iWriteRowid = iRowid;
+  p->bDelete = bDelete;
+  if( bDelete==0 ){
+    p->nPendingRow++;
+  }
+  return fts5IndexReturn(p);
+}
+
+/*
+** Commit data to disk.
+*/
+static int sqlite3Fts5IndexSync(Fts5Index *p){
+  assert( p->rc==SQLITE_OK );
+  fts5IndexFlush(p);
+  sqlite3Fts5IndexCloseReader(p);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Discard any data stored in the in-memory hash tables. Do not write it
+** to the database. Additionally, assume that the contents of the %_data
+** table may have changed on disk. So any in-memory caches of %_data 
+** records must be invalidated.
+*/
+static int sqlite3Fts5IndexRollback(Fts5Index *p){
+  sqlite3Fts5IndexCloseReader(p);
+  fts5IndexDiscardData(p);
+  fts5StructureInvalidate(p);
+  /* assert( p->rc==SQLITE_OK ); */
+  return SQLITE_OK;
+}
+
+/*
+** The %_data table is completely empty when this function is called. This
+** function populates it with the initial structure objects for each index,
+** and the initial version of the "averages" record (a zero-byte blob).
+*/
+static int sqlite3Fts5IndexReinit(Fts5Index *p){
+  Fts5Structure s;
+  fts5StructureInvalidate(p);
+  fts5IndexDiscardData(p);
+  memset(&s, 0, sizeof(Fts5Structure));
+  if( p->pConfig->bContentlessDelete ){
+    s.nOriginCntr = 1;
+  }
+  fts5DataWrite(p, FTS5_AVERAGES_ROWID, (const u8*)"", 0);
+  fts5StructureWrite(p, &s);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Open a new Fts5Index handle. If the bCreate argument is true, create
+** and initialize the underlying %_data table.
+**
+** If successful, set *pp to point to the new object and return SQLITE_OK.
+** Otherwise, set *pp to NULL and return an SQLite error code.
+*/
+static int sqlite3Fts5IndexOpen(
+  Fts5Config *pConfig, 
+  int bCreate, 
+  Fts5Index **pp,
+  char **pzErr
+){
+  int rc = SQLITE_OK;
+  Fts5Index *p;                   /* New object */
+
+  *pp = p = (Fts5Index*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5Index));
+  if( rc==SQLITE_OK ){
+    p->pConfig = pConfig;
+    p->nWorkUnit = FTS5_WORK_UNIT;
+    p->zDataTbl = sqlite3Fts5Mprintf(&rc, "%s_data", pConfig->zName);
+    if( p->zDataTbl && bCreate ){
+      rc = sqlite3Fts5CreateTable(
+          pConfig, "data", "id INTEGER PRIMARY KEY, block BLOB", 0, pzErr
+      );
+      if( rc==SQLITE_OK ){
+        rc = sqlite3Fts5CreateTable(pConfig, "idx", 
+            "segid, term, pgno, PRIMARY KEY(segid, term)", 
+            1, pzErr
+        );
+      }
+      if( rc==SQLITE_OK ){
+        rc = sqlite3Fts5IndexReinit(p);
+      }
+    }
+  }
+
+  assert( rc!=SQLITE_OK || p->rc==SQLITE_OK );
+  if( rc ){
+    sqlite3Fts5IndexClose(p);
+    *pp = 0;
+  }
+  return rc;
+}
+
+/*
+** Close a handle opened by an earlier call to sqlite3Fts5IndexOpen().
+*/
+static int sqlite3Fts5IndexClose(Fts5Index *p){
+  int rc = SQLITE_OK;
+  if( p ){
+    assert( p->pReader==0 );
+    fts5StructureInvalidate(p);
+    sqlite3_finalize(p->pWriter);
+    sqlite3_finalize(p->pDeleter);
+    sqlite3_finalize(p->pIdxWriter);
+    sqlite3_finalize(p->pIdxDeleter);
+    sqlite3_finalize(p->pIdxSelect);
+    sqlite3_finalize(p->pIdxNextSelect);
+    sqlite3_finalize(p->pDataVersion);
+    sqlite3_finalize(p->pDeleteFromIdx);
+    sqlite3Fts5HashFree(p->pHash);
+    sqlite3_free(p->zDataTbl);
+    sqlite3_free(p);
+  }
+  return rc;
+}
+
+/*
+** Argument p points to a buffer containing utf-8 text that is n bytes in 
+** size. Return the number of bytes in the nChar character prefix of the
+** buffer, or 0 if there are less than nChar characters in total.
+*/
+static int sqlite3Fts5IndexCharlenToBytelen(
+  const char *p, 
+  int nByte, 
+  int nChar
+){
+  int n = 0;
+  int i;
+  for(i=0; i<nChar; i++){
+    if( n>=nByte ) return 0;      /* Input contains fewer than nChar chars */
+    if( (unsigned char)p[n++]>=0xc0 ){
+      if( n>=nByte ) return 0;
+      while( (p[n] & 0xc0)==0x80 ){
+        n++;
+        if( n>=nByte ){
+          if( i+1==nChar ) break;
+          return 0;
+        }
+      }
+    }
+  }
+  return n;
+}
+
+/*
+** pIn is a UTF-8 encoded string, nIn bytes in size. Return the number of
+** unicode characters in the string.
+*/
+static int fts5IndexCharlen(const char *pIn, int nIn){
+  int nChar = 0;            
+  int i = 0;
+  while( i<nIn ){
+    if( (unsigned char)pIn[i++]>=0xc0 ){
+      while( i<nIn && (pIn[i] & 0xc0)==0x80 ) i++;
+    }
+    nChar++;
+  }
+  return nChar;
+}
+
+/*
+** Insert or remove data to or from the index. Each time a document is 
+** added to or removed from the index, this function is called one or more
+** times.
+**
+** For an insert, it must be called once for each token in the new document.
+** If the operation is a delete, it must be called (at least) once for each
+** unique token in the document with an iCol value less than zero. The iPos
+** argument is ignored for a delete.
+*/
+static int sqlite3Fts5IndexWrite(
+  Fts5Index *p,                   /* Index to write to */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+){
+  int i;                          /* Used to iterate through indexes */
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Config *pConfig = p->pConfig;
+
+  assert( p->rc==SQLITE_OK );
+  assert( (iCol<0)==p->bDelete );
+
+  /* Add the entry to the main terms index. */
+  rc = sqlite3Fts5HashWrite(
+      p->pHash, p->iWriteRowid, iCol, iPos, FTS5_MAIN_PREFIX, pToken, nToken
+  );
+
+  for(i=0; i<pConfig->nPrefix && rc==SQLITE_OK; i++){
+    const int nChar = pConfig->aPrefix[i];
+    int nByte = sqlite3Fts5IndexCharlenToBytelen(pToken, nToken, nChar);
+    if( nByte ){
+      rc = sqlite3Fts5HashWrite(p->pHash, 
+          p->iWriteRowid, iCol, iPos, (char)(FTS5_MAIN_PREFIX+i+1), pToken,
+          nByte
+      );
+    }
+  }
+
+  return rc;
+}
+
+/*
+** pToken points to a buffer of size nToken bytes containing a search 
+** term, including the index number at the start, used on a tokendata=1
+** table. This function returns true if the term in buffer pBuf matches 
+** token pToken/nToken.
+*/
+static int fts5IsTokendataPrefix(
+  Fts5Buffer *pBuf,
+  const u8 *pToken,
+  int nToken
+){
+  return (
+      pBuf->n>=nToken 
+   && 0==memcmp(pBuf->p, pToken, nToken)
+   && (pBuf->n==nToken || pBuf->p[nToken]==0x00)
+  );
+}
+
+/*
+** Ensure the segment-iterator passed as the only argument points to EOF.
+*/
+static void fts5SegIterSetEOF(Fts5SegIter *pSeg){
+  fts5DataRelease(pSeg->pLeaf);
+  pSeg->pLeaf = 0;
+}
+
+/*
+** Usually, a tokendata=1 iterator (struct Fts5TokenDataIter) accumulates an
+** array of these for each row it visits. Or, for an iterator used by an
+** "ORDER BY rank" query, it accumulates an array of these for the entire
+** query.
+**
+** Each instance in the array indicates the iterator (and therefore term)
+** associated with position iPos of rowid iRowid. This is used by the
+** xInstToken() API.
+*/
+struct Fts5TokenDataMap {
+  i64 iRowid;                     /* Row this token is located in */
+  i64 iPos;                       /* Position of token */
+  int iIter;                      /* Iterator token was read from */
+};
+
+/*
+** An object used to supplement Fts5Iter for tokendata=1 iterators.
+*/
+struct Fts5TokenDataIter {
+  int nIter;
+  int nIterAlloc;
+
+  int nMap;
+  int nMapAlloc;
+  Fts5TokenDataMap *aMap;
+
+  Fts5PoslistReader *aPoslistReader;
+  int *aPoslistToIter;
+  Fts5Iter *apIter[1];
+};
+
+/*
+** This function appends iterator pAppend to Fts5TokenDataIter pIn and 
+** returns the result.
+*/
+static Fts5TokenDataIter *fts5AppendTokendataIter(
+  Fts5Index *p,                   /* Index object (for error code) */
+  Fts5TokenDataIter *pIn,         /* Current Fts5TokenDataIter struct */
+  Fts5Iter *pAppend               /* Append this iterator */
+){
+  Fts5TokenDataIter *pRet = pIn;
+
+  if( p->rc==SQLITE_OK ){
+    if( pIn==0 || pIn->nIter==pIn->nIterAlloc ){
+      int nAlloc = pIn ? pIn->nIterAlloc*2 : 16;
+      int nByte = nAlloc * sizeof(Fts5Iter*) + sizeof(Fts5TokenDataIter);
+      Fts5TokenDataIter *pNew = (Fts5TokenDataIter*)sqlite3_realloc(pIn, nByte);
+
+      if( pNew==0 ){
+        p->rc = SQLITE_NOMEM;
+      }else{
+        if( pIn==0 ) memset(pNew, 0, nByte);
+        pRet = pNew;
+        pNew->nIterAlloc = nAlloc;
+      }
+    }
+  }
+  if( p->rc ){
+    sqlite3Fts5IterClose((Fts5IndexIter*)pAppend);
+  }else{
+    pRet->apIter[pRet->nIter++] = pAppend;
+  }
+  assert( pRet==0 || pRet->nIter<=pRet->nIterAlloc );
+
+  return pRet;
+}
+
+/*
+** Delete an Fts5TokenDataIter structure and its contents.
+*/
+static void fts5TokendataIterDelete(Fts5TokenDataIter *pSet){
+  if( pSet ){
+    int ii;
+    for(ii=0; ii<pSet->nIter; ii++){
+      fts5MultiIterFree(pSet->apIter[ii]);
+    }
+    sqlite3_free(pSet->aPoslistReader);
+    sqlite3_free(pSet->aMap);
+    sqlite3_free(pSet);
+  }
+}
+
+/*
+** Append a mapping to the token-map belonging to object pT.
+*/
+static void fts5TokendataIterAppendMap(
+  Fts5Index *p, 
+  Fts5TokenDataIter *pT, 
+  int iIter,
+  i64 iRowid, 
+  i64 iPos
+){
+  if( p->rc==SQLITE_OK ){
+    if( pT->nMap==pT->nMapAlloc ){
+      int nNew = pT->nMapAlloc ? pT->nMapAlloc*2 : 64;
+      int nByte = nNew * sizeof(Fts5TokenDataMap);
+      Fts5TokenDataMap *aNew;
+
+      aNew = (Fts5TokenDataMap*)sqlite3_realloc(pT->aMap, nByte);
+      if( aNew==0 ){
+        p->rc = SQLITE_NOMEM;
+        return;
+      }
+
+      pT->aMap = aNew;
+      pT->nMapAlloc = nNew;
+    }
+
+    pT->aMap[pT->nMap].iRowid = iRowid;
+    pT->aMap[pT->nMap].iPos = iPos;
+    pT->aMap[pT->nMap].iIter = iIter;
+    pT->nMap++;
+  }
+}
+
+/*
+** The iterator passed as the only argument must be a tokendata=1 iterator
+** (pIter->pTokenDataIter!=0). This function sets the iterator output
+** variables (pIter->base.*) according to the contents of the current
+** row.
+*/
+static void fts5IterSetOutputsTokendata(Fts5Iter *pIter){
+  int ii;
+  int nHit = 0;
+  i64 iRowid = SMALLEST_INT64;
+  int iMin = 0;
+
+  Fts5TokenDataIter *pT = pIter->pTokenDataIter;
+
+  pIter->base.nData = 0;
+  pIter->base.pData = 0;
+
+  for(ii=0; ii<pT->nIter; ii++){
+    Fts5Iter *p = pT->apIter[ii];
+    if( p->base.bEof==0 ){
+      if( nHit==0 || p->base.iRowid<iRowid ){
+        iRowid = p->base.iRowid;
+        nHit = 1;
+        pIter->base.pData = p->base.pData;
+        pIter->base.nData = p->base.nData;
+        iMin = ii;
+      }else if( p->base.iRowid==iRowid ){
+        nHit++;
+      }
+    }
+  }
+
+  if( nHit==0 ){
+    pIter->base.bEof = 1;
+  }else{
+    int eDetail = pIter->pIndex->pConfig->eDetail;
+    pIter->base.bEof = 0;
+    pIter->base.iRowid = iRowid;
+
+    if( nHit==1 && eDetail==FTS5_DETAIL_FULL ){
+      fts5TokendataIterAppendMap(pIter->pIndex, pT, iMin, iRowid, -1);
+    }else
+    if( nHit>1 && eDetail!=FTS5_DETAIL_NONE ){
+      int nReader = 0;
+      int nByte = 0;
+      i64 iPrev = 0;
+
+      /* Allocate array of iterators if they are not already allocated. */
+      if( pT->aPoslistReader==0 ){
+        pT->aPoslistReader = (Fts5PoslistReader*)sqlite3Fts5MallocZero(
+            &pIter->pIndex->rc,
+            pT->nIter * (sizeof(Fts5PoslistReader) + sizeof(int))
+        );
+        if( pT->aPoslistReader==0 ) return;
+        pT->aPoslistToIter = (int*)&pT->aPoslistReader[pT->nIter];
+      }
+
+      /* Populate an iterator for each poslist that will be merged */
+      for(ii=0; ii<pT->nIter; ii++){
+        Fts5Iter *p = pT->apIter[ii];
+        if( iRowid==p->base.iRowid ){
+          pT->aPoslistToIter[nReader] = ii;
+          sqlite3Fts5PoslistReaderInit(
+              p->base.pData, p->base.nData, &pT->aPoslistReader[nReader++]
+          );
+          nByte += p->base.nData;
+        }
+      }
+
+      /* Ensure the output buffer is large enough */
+      if( fts5BufferGrow(&pIter->pIndex->rc, &pIter->poslist, nByte+nHit*10) ){
+        return;
+      }
+
+      /* Ensure the token-mapping is large enough */
+      if( eDetail==FTS5_DETAIL_FULL && pT->nMapAlloc<(pT->nMap + nByte) ){
+        int nNew = (pT->nMapAlloc + nByte) * 2;
+        Fts5TokenDataMap *aNew = (Fts5TokenDataMap*)sqlite3_realloc(
+            pT->aMap, nNew*sizeof(Fts5TokenDataMap)
+        );
+        if( aNew==0 ){
+          pIter->pIndex->rc = SQLITE_NOMEM;
+          return;
+        }
+        pT->aMap = aNew;
+        pT->nMapAlloc = nNew;
+      }
+
+      pIter->poslist.n = 0;
+
+      while( 1 ){
+        i64 iMinPos = LARGEST_INT64;
+
+        /* Find smallest position */
+        iMin = 0;
+        for(ii=0; ii<nReader; ii++){
+          Fts5PoslistReader *pReader = &pT->aPoslistReader[ii];
+          if( pReader->bEof==0 ){
+            if( pReader->iPos<iMinPos ){
+              iMinPos = pReader->iPos;
+              iMin = ii;
+            }
+          }
+        }
+
+        /* If all readers were at EOF, break out of the loop. */
+        if( iMinPos==LARGEST_INT64 ) break;
+
+        sqlite3Fts5PoslistSafeAppend(&pIter->poslist, &iPrev, iMinPos);
+        sqlite3Fts5PoslistReaderNext(&pT->aPoslistReader[iMin]);
+
+        if( eDetail==FTS5_DETAIL_FULL ){
+          pT->aMap[pT->nMap].iPos = iMinPos;
+          pT->aMap[pT->nMap].iIter = pT->aPoslistToIter[iMin];
+          pT->aMap[pT->nMap].iRowid = iRowid;
+          pT->nMap++;
+        }
+      }
+
+      pIter->base.pData = pIter->poslist.p;
+      pIter->base.nData = pIter->poslist.n;
+    }
+  }
+}
+
+/*
+** The iterator passed as the only argument must be a tokendata=1 iterator
+** (pIter->pTokenDataIter!=0). This function advances the iterator. If
+** argument bFrom is false, then the iterator is advanced to the next
+** entry. Or, if bFrom is true, it is advanced to the first entry with
+** a rowid of iFrom or greater.
+*/
+static void fts5TokendataIterNext(Fts5Iter *pIter, int bFrom, i64 iFrom){
+  int ii;
+  Fts5TokenDataIter *pT = pIter->pTokenDataIter;
+
+  for(ii=0; ii<pT->nIter; ii++){
+    Fts5Iter *p = pT->apIter[ii];
+    if( p->base.bEof==0 
+     && (p->base.iRowid==pIter->base.iRowid || (bFrom && p->base.iRowid<iFrom))
+    ){
+      fts5MultiIterNext(p->pIndex, p, bFrom, iFrom);
+      while( bFrom && p->base.bEof==0 
+          && p->base.iRowid<iFrom 
+          && p->pIndex->rc==SQLITE_OK 
+      ){
+        fts5MultiIterNext(p->pIndex, p, 0, 0);
+      }
+    }
+  }
+
+  fts5IterSetOutputsTokendata(pIter);
+}
+
+/*
+** If the segment-iterator passed as the first argument is at EOF, then
+** set pIter->term to a copy of buffer pTerm.
+*/
+static void fts5TokendataSetTermIfEof(Fts5Iter *pIter, Fts5Buffer *pTerm){
+  if( pIter && pIter->aSeg[0].pLeaf==0 ){
+    fts5BufferSet(&pIter->pIndex->rc, &pIter->aSeg[0].term, pTerm->n, pTerm->p);
+  }
+}
+
+/*
+** This function sets up an iterator to use for a non-prefix query on a 
+** tokendata=1 table. 
+*/
+static Fts5Iter *fts5SetupTokendataIter(
+  Fts5Index *p,                   /* FTS index to query */
+  const u8 *pToken,               /* Buffer containing query term */
+  int nToken,                     /* Size of buffer pToken in bytes */
+  Fts5Colset *pColset             /* Colset to filter on */
+){
+  Fts5Iter *pRet = 0;
+  Fts5TokenDataIter *pSet = 0;
+  Fts5Structure *pStruct = 0;
+  const int flags = FTS5INDEX_QUERY_SCANONETERM | FTS5INDEX_QUERY_SCAN;
+
+  Fts5Buffer bSeek = {0, 0, 0};
+  Fts5Buffer *pSmall = 0;             
+
+  fts5IndexFlush(p);
+  pStruct = fts5StructureRead(p);
+
+  while( p->rc==SQLITE_OK ){
+    Fts5Iter *pPrev = pSet ? pSet->apIter[pSet->nIter-1] : 0;
+    Fts5Iter *pNew = 0;
+    Fts5SegIter *pNewIter = 0;
+    Fts5SegIter *pPrevIter = 0;
+
+    int iLvl, iSeg, ii;
+
+    pNew = fts5MultiIterAlloc(p, pStruct->nSegment);
+    if( pSmall ){
+      fts5BufferSet(&p->rc, &bSeek, pSmall->n, pSmall->p);
+      fts5BufferAppendBlob(&p->rc, &bSeek, 1, (const u8*)"\0");
+    }else{
+      fts5BufferSet(&p->rc, &bSeek, nToken, pToken);
+    }
+    if( p->rc ){
+      sqlite3Fts5IterClose((Fts5IndexIter*)pNew);
+      break;
+    }
+
+    pNewIter = &pNew->aSeg[0];
+    pPrevIter = (pPrev ? &pPrev->aSeg[0] : 0);
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      for(iSeg=pStruct->aLevel[iLvl].nSeg-1; iSeg>=0; iSeg--){
+        Fts5StructureSegment *pSeg = &pStruct->aLevel[iLvl].aSeg[iSeg];
+        int bDone = 0;
+
+        if( pPrevIter ){
+          if( fts5BufferCompare(pSmall, &pPrevIter->term) ){
+            memcpy(pNewIter, pPrevIter, sizeof(Fts5SegIter));
+            memset(pPrevIter, 0, sizeof(Fts5SegIter));
+            bDone = 1;
+          }else if( pPrevIter->iEndofDoclist>pPrevIter->pLeaf->szLeaf ){
+            fts5SegIterNextInit(p,(const char*)bSeek.p,bSeek.n-1,pSeg,pNewIter);
+            bDone = 1;
+          }
+        }
+
+        if( bDone==0 ){
+          fts5SegIterSeekInit(p, bSeek.p, bSeek.n, flags, pSeg, pNewIter);
+        }
+
+        if( pPrevIter ){
+          if( pPrevIter->pTombArray ){
+            pNewIter->pTombArray = pPrevIter->pTombArray;
+            pNewIter->pTombArray->nRef++;
+          }
+        }else{
+          fts5SegIterAllocTombstone(p, pNewIter);
+        }
+
+        pNewIter++;
+        if( pPrevIter ) pPrevIter++;
+        if( p->rc ) break;
+      }
+    }
+    fts5TokendataSetTermIfEof(pPrev, pSmall);
+
+    pNew->bSkipEmpty = 1;
+    pNew->pColset = pColset;
+    fts5IterSetOutputCb(&p->rc, pNew);
+
+    /* Loop through all segments in the new iterator. Find the smallest 
+    ** term that any segment-iterator points to. Iterator pNew will be
+    ** used for this term. Also, set any iterator that points to a term that
+    ** does not match pToken/nToken to point to EOF */
+    pSmall = 0;
+    for(ii=0; ii<pNew->nSeg; ii++){
+      Fts5SegIter *pII = &pNew->aSeg[ii];
+      if( 0==fts5IsTokendataPrefix(&pII->term, pToken, nToken) ){
+        fts5SegIterSetEOF(pII);
+      }
+      if( pII->pLeaf && (!pSmall || fts5BufferCompare(pSmall, &pII->term)>0) ){
+        pSmall = &pII->term;
+      }
+    }
+
+    /* If pSmall is still NULL at this point, then the new iterator does
+    ** not point to any terms that match the query. So delete it and break
+    ** out of the loop - all required iterators have been collected.  */
+    if( pSmall==0 ){
+      sqlite3Fts5IterClose((Fts5IndexIter*)pNew);
+      break;
+    }
+
+    /* Append this iterator to the set and continue. */
+    pSet = fts5AppendTokendataIter(p, pSet, pNew);
+  }
+
+  if( p->rc==SQLITE_OK && pSet ){
+    int ii;
+    for(ii=0; ii<pSet->nIter; ii++){
+      Fts5Iter *pIter = pSet->apIter[ii];
+      int iSeg;
+      for(iSeg=0; iSeg<pIter->nSeg; iSeg++){
+        pIter->aSeg[iSeg].flags |= FTS5_SEGITER_ONETERM;
+      }
+      fts5MultiIterFinishSetup(p, pIter);
+    }
+  }
+    
+  if( p->rc==SQLITE_OK ){
+    pRet = fts5MultiIterAlloc(p, 0);
+  }
+  if( pRet ){
+    pRet->pTokenDataIter = pSet;
+    if( pSet ){
+      fts5IterSetOutputsTokendata(pRet);
+    }else{
+      pRet->base.bEof = 1;
+    }
+  }else{
+    fts5TokendataIterDelete(pSet);
+  }
+
+  fts5StructureRelease(pStruct);
+  fts5BufferFree(&bSeek);
+  return pRet;
+}
+
+
+/*
+** Open a new iterator to iterate though all rowid that match the 
+** specified token or token prefix.
+*/
+static int sqlite3Fts5IndexQuery(
+  Fts5Index *p,                   /* FTS index to query */
+  const char *pToken, int nToken, /* Token (or prefix) to query for */
+  int flags,                      /* Mask of FTS5INDEX_QUERY_X flags */
+  Fts5Colset *pColset,            /* Match these columns only */
+  Fts5IndexIter **ppIter          /* OUT: New iterator object */
+){
+  Fts5Config *pConfig = p->pConfig;
+  Fts5Iter *pRet = 0;
+  Fts5Buffer buf = {0, 0, 0};
+
+  /* If the QUERY_SCAN flag is set, all other flags must be clear. */
+  assert( (flags & FTS5INDEX_QUERY_SCAN)==0 || flags==FTS5INDEX_QUERY_SCAN );
+
+  if( sqlite3Fts5BufferSize(&p->rc, &buf, nToken+1)==0 ){
+    int iIdx = 0;                 /* Index to search */
+    int iPrefixIdx = 0;           /* +1 prefix index */
+    int bTokendata = pConfig->bTokendata;
+    if( nToken>0 ) memcpy(&buf.p[1], pToken, nToken);
+
+    if( flags & (FTS5INDEX_QUERY_NOTOKENDATA|FTS5INDEX_QUERY_SCAN) ){
+      bTokendata = 0;
+    }
+
+    /* Figure out which index to search and set iIdx accordingly. If this
+    ** is a prefix query for which there is no prefix index, set iIdx to
+    ** greater than pConfig->nPrefix to indicate that the query will be
+    ** satisfied by scanning multiple terms in the main index.
+    **
+    ** If the QUERY_TEST_NOIDX flag was specified, then this must be a
+    ** prefix-query. Instead of using a prefix-index (if one exists), 
+    ** evaluate the prefix query using the main FTS index. This is used
+    ** for internal sanity checking by the integrity-check in debug 
+    ** mode only.  */
+#ifdef SQLITE_DEBUG
+    if( pConfig->bPrefixIndex==0 || (flags & FTS5INDEX_QUERY_TEST_NOIDX) ){
+      assert( flags & FTS5INDEX_QUERY_PREFIX );
+      iIdx = 1+pConfig->nPrefix;
+    }else
+#endif
+    if( flags & FTS5INDEX_QUERY_PREFIX ){
+      int nChar = fts5IndexCharlen(pToken, nToken);
+      for(iIdx=1; iIdx<=pConfig->nPrefix; iIdx++){
+        int nIdxChar = pConfig->aPrefix[iIdx-1];
+        if( nIdxChar==nChar ) break;
+        if( nIdxChar==nChar+1 ) iPrefixIdx = iIdx;
+      }
+    }
+
+    if( bTokendata && iIdx==0 ){
+      buf.p[0] = '0';
+      pRet = fts5SetupTokendataIter(p, buf.p, nToken+1, pColset);
+    }else if( iIdx<=pConfig->nPrefix ){
+      /* Straight index lookup */
+      Fts5Structure *pStruct = fts5StructureRead(p);
+      buf.p[0] = (u8)(FTS5_MAIN_PREFIX + iIdx);
+      if( pStruct ){
+        fts5MultiIterNew(p, pStruct, flags | FTS5INDEX_QUERY_SKIPEMPTY, 
+            pColset, buf.p, nToken+1, -1, 0, &pRet
+        );
+        fts5StructureRelease(pStruct);
+      }
+    }else{
+      /* Scan multiple terms in the main index */
+      int bDesc = (flags & FTS5INDEX_QUERY_DESC)!=0;
+      fts5SetupPrefixIter(p, bDesc, iPrefixIdx, buf.p, nToken+1, pColset,&pRet);
+      if( pRet==0 ){
+        assert( p->rc!=SQLITE_OK );
+      }else{
+        assert( pRet->pColset==0 );
+        fts5IterSetOutputCb(&p->rc, pRet);
+        if( p->rc==SQLITE_OK ){
+          Fts5SegIter *pSeg = &pRet->aSeg[pRet->aFirst[1].iFirst];
+          if( pSeg->pLeaf ) pRet->xSetOutputs(pRet, pSeg);
+        }
+      }
+    }
+
+    if( p->rc ){
+      sqlite3Fts5IterClose((Fts5IndexIter*)pRet);
+      pRet = 0;
+      sqlite3Fts5IndexCloseReader(p);
+    }
+
+    *ppIter = (Fts5IndexIter*)pRet;
+    sqlite3Fts5BufferFree(&buf);
+  }
+  return fts5IndexReturn(p);
+}
+
+/*
+** Return true if the iterator passed as the only argument is at EOF.
+*/
+/*
+** Move to the next matching rowid. 
+*/
+static int sqlite3Fts5IterNext(Fts5IndexIter *pIndexIter){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  assert( pIter->pIndex->rc==SQLITE_OK );
+  if( pIter->pTokenDataIter ){
+    fts5TokendataIterNext(pIter, 0, 0);
+  }else{
+    fts5MultiIterNext(pIter->pIndex, pIter, 0, 0);
+  }
+  return fts5IndexReturn(pIter->pIndex);
+}
+
+/*
+** Move to the next matching term/rowid. Used by the fts5vocab module.
+*/
+static int sqlite3Fts5IterNextScan(Fts5IndexIter *pIndexIter){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  Fts5Index *p = pIter->pIndex;
+
+  assert( pIter->pIndex->rc==SQLITE_OK );
+
+  fts5MultiIterNext(p, pIter, 0, 0);
+  if( p->rc==SQLITE_OK ){
+    Fts5SegIter *pSeg = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+    if( pSeg->pLeaf && pSeg->term.p[0]!=FTS5_MAIN_PREFIX ){
+      fts5DataRelease(pSeg->pLeaf);
+      pSeg->pLeaf = 0;
+      pIter->base.bEof = 1;
+    }
+  }
+
+  return fts5IndexReturn(pIter->pIndex);
+}
+
+/*
+** Move to the next matching rowid that occurs at or after iMatch. The
+** definition of "at or after" depends on whether this iterator iterates
+** in ascending or descending rowid order.
+*/
+static int sqlite3Fts5IterNextFrom(Fts5IndexIter *pIndexIter, i64 iMatch){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  if( pIter->pTokenDataIter ){
+    fts5TokendataIterNext(pIter, 1, iMatch);
+  }else{
+    fts5MultiIterNextFrom(pIter->pIndex, pIter, iMatch);
+  }
+  return fts5IndexReturn(pIter->pIndex);
+}
+
+/*
+** Return the current term.
+*/
+static const char *sqlite3Fts5IterTerm(Fts5IndexIter *pIndexIter, int *pn){
+  int n;
+  const char *z = (const char*)fts5MultiIterTerm((Fts5Iter*)pIndexIter, &n);
+  assert_nc( z || n<=1 );
+  *pn = n-1;
+  return (z ? &z[1] : 0);
+}
+
+/*
+** This is used by xInstToken() to access the token at offset iOff, column
+** iCol of row iRowid. The token is returned via output variables *ppOut
+** and *pnOut. The iterator passed as the first argument must be a tokendata=1
+** iterator (pIter->pTokenDataIter!=0).
+*/
+static int sqlite3Fts5IterToken(
+  Fts5IndexIter *pIndexIter, 
+  i64 iRowid,
+  int iCol, 
+  int iOff, 
+  const char **ppOut, int *pnOut
+){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  Fts5TokenDataIter *pT = pIter->pTokenDataIter;
+  Fts5TokenDataMap *aMap = pT->aMap;
+  i64 iPos = (((i64)iCol)<<32) + iOff;
+
+  int i1 = 0;
+  int i2 = pT->nMap;
+  int iTest = 0;
+
+  while( i2>i1 ){
+    iTest = (i1 + i2) / 2;
+
+    if( aMap[iTest].iRowid<iRowid ){
+      i1 = iTest+1;
+    }else if( aMap[iTest].iRowid>iRowid ){
+      i2 = iTest;
+    }else{
+      if( aMap[iTest].iPos<iPos ){
+        if( aMap[iTest].iPos<0 ){
+          break;
+        }
+        i1 = iTest+1;
+      }else if( aMap[iTest].iPos>iPos ){
+        i2 = iTest;
+      }else{
+        break;
+      }
+    }
+  }
+
+  if( i2>i1 ){
+    Fts5Iter *pMap = pT->apIter[aMap[iTest].iIter];
+    *ppOut = (const char*)pMap->aSeg[0].term.p+1;
+    *pnOut = pMap->aSeg[0].term.n-1;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Clear any existing entries from the token-map associated with the
+** iterator passed as the only argument. 
+*/
+static void sqlite3Fts5IndexIterClearTokendata(Fts5IndexIter *pIndexIter){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  if( pIter && pIter->pTokenDataIter ){
+    pIter->pTokenDataIter->nMap = 0;
+  }
+}
+
+/*
+** Set a token-mapping for the iterator passed as the first argument. This
+** is used in detail=column or detail=none mode when a token is requested
+** using the xInstToken() API. In this case the caller tokenizers the
+** current row and configures the token-mapping via multiple calls to this
+** function.
+*/
+static int sqlite3Fts5IndexIterWriteTokendata(
+  Fts5IndexIter *pIndexIter, 
+  const char *pToken, int nToken, 
+  i64 iRowid, int iCol, int iOff
+){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  Fts5TokenDataIter *pT = pIter->pTokenDataIter;
+  Fts5Index *p = pIter->pIndex;
+  int ii;
+
+  assert( p->pConfig->eDetail!=FTS5_DETAIL_FULL );
+  assert( pIter->pTokenDataIter );
+
+  for(ii=0; ii<pT->nIter; ii++){
+    Fts5Buffer *pTerm = &pT->apIter[ii]->aSeg[0].term;
+    if( nToken==pTerm->n-1 && memcmp(pToken, pTerm->p+1, nToken)==0 ) break;
+  }
+  if( ii<pT->nIter ){
+    fts5TokendataIterAppendMap(p, pT, ii, iRowid, (((i64)iCol)<<32) + iOff);
+  }
+  return fts5IndexReturn(p);
+}
+
+/*
+** Close an iterator opened by an earlier call to sqlite3Fts5IndexQuery().
+*/
+static void sqlite3Fts5IterClose(Fts5IndexIter *pIndexIter){
+  if( pIndexIter ){
+    Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+    Fts5Index *pIndex = pIter->pIndex;
+    fts5TokendataIterDelete(pIter->pTokenDataIter);
+    fts5MultiIterFree(pIter);
+    sqlite3Fts5IndexCloseReader(pIndex);
+  }
+}
+
+/*
+** Read and decode the "averages" record from the database. 
+**
+** Parameter anSize must point to an array of size nCol, where nCol is
+** the number of user defined columns in the FTS table.
+*/
+static int sqlite3Fts5IndexGetAverages(Fts5Index *p, i64 *pnRow, i64 *anSize){
+  int nCol = p->pConfig->nCol;
+  Fts5Data *pData;
+
+  *pnRow = 0;
+  memset(anSize, 0, sizeof(i64) * nCol);
+  pData = fts5DataRead(p, FTS5_AVERAGES_ROWID);
+  if( p->rc==SQLITE_OK && pData->nn ){
+    int i = 0;
+    int iCol;
+    i += fts5GetVarint(&pData->p[i], (u64*)pnRow);
+    for(iCol=0; i<pData->nn && iCol<nCol; iCol++){
+      i += fts5GetVarint(&pData->p[i], (u64*)&anSize[iCol]);
+    }
+  }
+
+  fts5DataRelease(pData);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Replace the current "averages" record with the contents of the buffer 
+** supplied as the second argument.
+*/
+static int sqlite3Fts5IndexSetAverages(Fts5Index *p, const u8 *pData, int nData){
+  assert( p->rc==SQLITE_OK );
+  fts5DataWrite(p, FTS5_AVERAGES_ROWID, pData, nData);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Return the total number of blocks this module has read from the %_data
+** table since it was created.
+*/
+static int sqlite3Fts5IndexReads(Fts5Index *p){
+  return p->nRead;
+}
+
+/*
+** Set the 32-bit cookie value stored at the start of all structure 
+** records to the value passed as the second argument.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int sqlite3Fts5IndexSetCookie(Fts5Index *p, int iNew){
+  int rc;                              /* Return code */
+  Fts5Config *pConfig = p->pConfig;    /* Configuration object */
+  u8 aCookie[4];                       /* Binary representation of iNew */
+  sqlite3_blob *pBlob = 0;
+
+  assert( p->rc==SQLITE_OK );
+  sqlite3Fts5Put32(aCookie, iNew);
+
+  rc = sqlite3_blob_open(pConfig->db, pConfig->zDb, p->zDataTbl, 
+      "block", FTS5_STRUCTURE_ROWID, 1, &pBlob
+  );
+  if( rc==SQLITE_OK ){
+    sqlite3_blob_write(pBlob, aCookie, 4, 0);
+    rc = sqlite3_blob_close(pBlob);
+  }
+
+  return rc;
+}
+
+static int sqlite3Fts5IndexLoadConfig(Fts5Index *p){
+  Fts5Structure *pStruct;
+  pStruct = fts5StructureRead(p);
+  fts5StructureRelease(pStruct);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Retrieve the origin value that will be used for the segment currently
+** being accumulated in the in-memory hash table when it is flushed to
+** disk. If successful, SQLITE_OK is returned and (*piOrigin) set to
+** the queried value. Or, if an error occurs, an error code is returned
+** and the final value of (*piOrigin) is undefined.
+*/
+static int sqlite3Fts5IndexGetOrigin(Fts5Index *p, i64 *piOrigin){
+  Fts5Structure *pStruct;
+  pStruct = fts5StructureRead(p);
+  if( pStruct ){
+    *piOrigin = pStruct->nOriginCntr;
+    fts5StructureRelease(pStruct);
+  }
+  return fts5IndexReturn(p);
+}
+
+/*
+** Buffer pPg contains a page of a tombstone hash table - one of nPg pages
+** associated with the same segment. This function adds rowid iRowid to
+** the hash table. The caller is required to guarantee that there is at
+** least one free slot on the page.
+**
+** If parameter bForce is false and the hash table is deemed to be full
+** (more than half of the slots are occupied), then non-zero is returned
+** and iRowid not inserted. Or, if bForce is true or if the hash table page
+** is not full, iRowid is inserted and zero returned.
+*/
+static int fts5IndexTombstoneAddToPage(
+  Fts5Data *pPg, 
+  int bForce,
+  int nPg, 
+  u64 iRowid
+){
+  const int szKey = TOMBSTONE_KEYSIZE(pPg);
+  const int nSlot = TOMBSTONE_NSLOT(pPg);
+  const int nElem = fts5GetU32(&pPg->p[4]);
+  int iSlot = (iRowid / nPg) % nSlot;
+  int nCollide = nSlot;
+
+  if( szKey==4 && iRowid>0xFFFFFFFF ) return 2;
+  if( iRowid==0 ){
+    pPg->p[1] = 0x01;
+    return 0;
+  }
+
+  if( bForce==0 && nElem>=(nSlot/2) ){
+    return 1;
+  }
+
+  fts5PutU32(&pPg->p[4], nElem+1);
+  if( szKey==4 ){
+    u32 *aSlot = (u32*)&pPg->p[8];
+    while( aSlot[iSlot] ){
+      iSlot = (iSlot + 1) % nSlot;
+      if( nCollide--==0 ) return 0;
+    }
+    fts5PutU32((u8*)&aSlot[iSlot], (u32)iRowid);
+  }else{
+    u64 *aSlot = (u64*)&pPg->p[8];
+    while( aSlot[iSlot] ){
+      iSlot = (iSlot + 1) % nSlot;
+      if( nCollide--==0 ) return 0;
+    }
+    fts5PutU64((u8*)&aSlot[iSlot], iRowid);
+  }
+
+  return 0;
+}
+
+/*
+** This function attempts to build a new hash containing all the keys 
+** currently in the tombstone hash table for segment pSeg. The new
+** hash will be stored in the nOut buffers passed in array apOut[].
+** All pages of the new hash use key-size szKey (4 or 8).
+**
+** Return 0 if the hash is successfully rebuilt into the nOut pages. 
+** Or non-zero if it is not (because one page became overfull). In this 
+** case the caller should retry with a larger nOut parameter.
+**
+** Parameter pData1 is page iPg1 of the hash table being rebuilt.
+*/
+static int fts5IndexTombstoneRehash(
+  Fts5Index *p,
+  Fts5StructureSegment *pSeg,     /* Segment to rebuild hash of */
+  Fts5Data *pData1,               /* One page of current hash - or NULL */
+  int iPg1,                       /* Which page of the current hash is pData1 */
+  int szKey,                      /* 4 or 8, the keysize */
+  int nOut,                       /* Number of output pages */
+  Fts5Data **apOut                /* Array of output hash pages */
+){
+  int ii;
+  int res = 0;
+
+  /* Initialize the headers of all the output pages */
+  for(ii=0; ii<nOut; ii++){
+    apOut[ii]->p[0] = szKey;
+    fts5PutU32(&apOut[ii]->p[4], 0);
+  }
+
+  /* Loop through the current pages of the hash table. */ 
+  for(ii=0; res==0 && ii<pSeg->nPgTombstone; ii++){
+    Fts5Data *pData = 0;          /* Page ii of the current hash table */
+    Fts5Data *pFree = 0;          /* Free this at the end of the loop */
+
+    if( iPg1==ii ){
+      pData = pData1;
+    }else{
+      pFree = pData = fts5DataRead(p, FTS5_TOMBSTONE_ROWID(pSeg->iSegid, ii));
+    }
+
+    if( pData ){
+      int szKeyIn = TOMBSTONE_KEYSIZE(pData);
+      int nSlotIn = (pData->nn - 8) / szKeyIn;
+      int iIn;
+      for(iIn=0; iIn<nSlotIn; iIn++){
+        u64 iVal = 0;
+
+        /* Read the value from slot iIn of the input page into iVal. */
+        if( szKeyIn==4 ){
+          u32 *aSlot = (u32*)&pData->p[8];
+          if( aSlot[iIn] ) iVal = fts5GetU32((u8*)&aSlot[iIn]);
+        }else{
+          u64 *aSlot = (u64*)&pData->p[8];
+          if( aSlot[iIn] ) iVal = fts5GetU64((u8*)&aSlot[iIn]);
+        }
+
+        /* If iVal is not 0 at this point, insert it into the new hash table */
+        if( iVal ){
+          Fts5Data *pPg = apOut[(iVal % nOut)];
+          res = fts5IndexTombstoneAddToPage(pPg, 0, nOut, iVal);
+          if( res ) break;
+        }
+      }
+
+      /* If this is page 0 of the old hash, copy the rowid-0-flag from the
+      ** old hash to the new.  */
+      if( ii==0 ){
+        apOut[0]->p[1] = pData->p[1];
+      }
+    }
+    fts5DataRelease(pFree);
+  }
+
+  return res;
+}
+
+/*
+** This is called to rebuild the hash table belonging to segment pSeg.
+** If parameter pData1 is not NULL, then one page of the existing hash table
+** has already been loaded - pData1, which is page iPg1. The key-size for
+** the new hash table is szKey (4 or 8).
+**
+** If successful, the new hash table is not written to disk. Instead, 
+** output parameter (*pnOut) is set to the number of pages in the new
+** hash table, and (*papOut) to point to an array of buffers containing
+** the new page data.
+**
+** If an error occurs, an error code is left in the Fts5Index object and
+** both output parameters set to 0 before returning.
+*/
+static void fts5IndexTombstoneRebuild(
+  Fts5Index *p,
+  Fts5StructureSegment *pSeg,     /* Segment to rebuild hash of */
+  Fts5Data *pData1,               /* One page of current hash - or NULL */
+  int iPg1,                       /* Which page of the current hash is pData1 */
+  int szKey,                      /* 4 or 8, the keysize */
+  int *pnOut,                     /* OUT: Number of output pages */
+  Fts5Data ***papOut              /* OUT: Output hash pages */
+){
+  const int MINSLOT = 32;
+  int nSlotPerPage = MAX(MINSLOT, (p->pConfig->pgsz - 8) / szKey);
+  int nSlot = 0;                  /* Number of slots in each output page */
+  int nOut = 0;
+
+  /* Figure out how many output pages (nOut) and how many slots per 
+  ** page (nSlot).  There are three possibilities: 
+  **
+  **   1. The hash table does not yet exist. In this case the new hash
+  **      table will consist of a single page with MINSLOT slots.
+  **
+  **   2. The hash table exists but is currently a single page. In this
+  **      case an attempt is made to grow the page to accommodate the new
+  **      entry. The page is allowed to grow up to nSlotPerPage (see above)
+  **      slots.
+  **
+  **   3. The hash table already consists of more than one page, or of
+  **      a single page already so large that it cannot be grown. In this
+  **      case the new hash consists of (nPg*2+1) pages of nSlotPerPage
+  **      slots each, where nPg is the current number of pages in the 
+  **      hash table.
+  */
+  if( pSeg->nPgTombstone==0 ){
+    /* Case 1. */
+    nOut = 1;
+    nSlot = MINSLOT;
+  }else if( pSeg->nPgTombstone==1 ){
+    /* Case 2. */
+    int nElem = (int)fts5GetU32(&pData1->p[4]);
+    assert( pData1 && iPg1==0 );
+    nOut = 1;
+    nSlot = MAX(nElem*4, MINSLOT);
+    if( nSlot>nSlotPerPage ) nOut = 0; 
+  }
+  if( nOut==0 ){
+    /* Case 3. */
+    nOut = (pSeg->nPgTombstone * 2 + 1);
+    nSlot = nSlotPerPage;
+  }
+
+  /* Allocate the required array and output pages */
+  while( 1 ){
+    int res = 0;
+    int ii = 0;
+    int szPage = 0;
+    Fts5Data **apOut = 0;
+
+    /* Allocate space for the new hash table */
+    assert( nSlot>=MINSLOT );
+    apOut = (Fts5Data**)sqlite3Fts5MallocZero(&p->rc, sizeof(Fts5Data*) * nOut);
+    szPage = 8 + nSlot*szKey;
+    for(ii=0; ii<nOut; ii++){
+      Fts5Data *pNew = (Fts5Data*)sqlite3Fts5MallocZero(&p->rc, 
+          sizeof(Fts5Data)+szPage
+      );
+      if( pNew ){
+        pNew->nn = szPage;
+        pNew->p = (u8*)&pNew[1];
+        apOut[ii] = pNew;
+      }
+    }
+
+    /* Rebuild the hash table. */
+    if( p->rc==SQLITE_OK ){
+      res = fts5IndexTombstoneRehash(p, pSeg, pData1, iPg1, szKey, nOut, apOut);
+    }
+    if( res==0 ){
+      if( p->rc ){
+        fts5IndexFreeArray(apOut, nOut);
+        apOut = 0;
+        nOut = 0;
+      }
+      *pnOut = nOut;
+      *papOut = apOut;
+      break;
+    }
+    
+    /* If control flows to here, it was not possible to rebuild the hash
+    ** table. Free all buffers and then try again with more pages. */
+    assert( p->rc==SQLITE_OK );
+    fts5IndexFreeArray(apOut, nOut);
+    nSlot = nSlotPerPage;
+    nOut = nOut*2 + 1;
+  }
+}
+
+
+/*
+** Add a tombstone for rowid iRowid to segment pSeg.
+*/
+static void fts5IndexTombstoneAdd(
+  Fts5Index *p, 
+  Fts5StructureSegment *pSeg, 
+  u64 iRowid
+){
+  Fts5Data *pPg = 0;
+  int iPg = -1;
+  int szKey = 0;
+  int nHash = 0;
+  Fts5Data **apHash = 0;
+
+  p->nContentlessDelete++;
+
+  if( pSeg->nPgTombstone>0 ){
+    iPg = iRowid % pSeg->nPgTombstone;
+    pPg = fts5DataRead(p, FTS5_TOMBSTONE_ROWID(pSeg->iSegid,iPg));
+    if( pPg==0 ){
+      assert( p->rc!=SQLITE_OK );
+      return;
+    }
+
+    if( 0==fts5IndexTombstoneAddToPage(pPg, 0, pSeg->nPgTombstone, iRowid) ){
+      fts5DataWrite(p, FTS5_TOMBSTONE_ROWID(pSeg->iSegid,iPg), pPg->p, pPg->nn);
+      fts5DataRelease(pPg);
+      return;
+    }
+  }
+
+  /* Have to rebuild the hash table. First figure out the key-size (4 or 8). */
+  szKey = pPg ? TOMBSTONE_KEYSIZE(pPg) : 4;
+  if( iRowid>0xFFFFFFFF ) szKey = 8;
+
+  /* Rebuild the hash table */
+  fts5IndexTombstoneRebuild(p, pSeg, pPg, iPg, szKey, &nHash, &apHash);
+  assert( p->rc==SQLITE_OK || (nHash==0 && apHash==0) );
+
+  /* If all has succeeded, write the new rowid into one of the new hash
+  ** table pages, then write them all out to disk. */
+  if( nHash ){
+    int ii = 0;
+    fts5IndexTombstoneAddToPage(apHash[iRowid % nHash], 1, nHash, iRowid);
+    for(ii=0; ii<nHash; ii++){
+      i64 iTombstoneRowid = FTS5_TOMBSTONE_ROWID(pSeg->iSegid, ii);
+      fts5DataWrite(p, iTombstoneRowid, apHash[ii]->p, apHash[ii]->nn);
+    }
+    pSeg->nPgTombstone = nHash;
+    fts5StructureWrite(p, p->pStruct);
+  }
+
+  fts5DataRelease(pPg);
+  fts5IndexFreeArray(apHash, nHash);
+}
+
+/*
+** Add iRowid to the tombstone list of the segment or segments that contain
+** rows from origin iOrigin. Return SQLITE_OK if successful, or an SQLite
+** error code otherwise.
+*/
+static int sqlite3Fts5IndexContentlessDelete(Fts5Index *p, i64 iOrigin, i64 iRowid){
+  Fts5Structure *pStruct;
+  pStruct = fts5StructureRead(p);
+  if( pStruct ){
+    int bFound = 0;               /* True after pSeg->nEntryTombstone incr. */
+    int iLvl;
+    for(iLvl=pStruct->nLevel-1; iLvl>=0; iLvl--){
+      int iSeg;
+      for(iSeg=pStruct->aLevel[iLvl].nSeg-1; iSeg>=0; iSeg--){
+        Fts5StructureSegment *pSeg = &pStruct->aLevel[iLvl].aSeg[iSeg];
+        if( pSeg->iOrigin1<=(u64)iOrigin && pSeg->iOrigin2>=(u64)iOrigin ){
+          if( bFound==0 ){
+            pSeg->nEntryTombstone++;
+            bFound = 1;
+          }
+          fts5IndexTombstoneAdd(p, pSeg, iRowid);
+        }
+      }
+    }
+    fts5StructureRelease(pStruct);
+  }
+  return fts5IndexReturn(p);
+}
+
+/*************************************************************************
+**************************************************************************
+** Below this point is the implementation of the integrity-check 
+** functionality.
+*/
+
+/*
+** Return a simple checksum value based on the arguments.
+*/
+static u64 sqlite3Fts5IndexEntryCksum(
+  i64 iRowid, 
+  int iCol, 
+  int iPos, 
+  int iIdx,
+  const char *pTerm,
+  int nTerm
+){
+  int i;
+  u64 ret = iRowid;
+  ret += (ret<<3) + iCol;
+  ret += (ret<<3) + iPos;
+  if( iIdx>=0 ) ret += (ret<<3) + (FTS5_MAIN_PREFIX + iIdx);
+  for(i=0; i<nTerm; i++) ret += (ret<<3) + pTerm[i];
+  return ret;
+}
+
+#ifdef SQLITE_DEBUG
+/*
+** This function is purely an internal test. It does not contribute to 
+** FTS functionality, or even the integrity-check, in any way.
+**
+** Instead, it tests that the same set of pgno/rowid combinations are 
+** visited regardless of whether the doclist-index identified by parameters
+** iSegid/iLeaf is iterated in forwards or reverse order.
+*/
+static void fts5TestDlidxReverse(
+  Fts5Index *p, 
+  int iSegid,                     /* Segment id to load from */
+  int iLeaf                       /* Load doclist-index for this leaf */
+){
+  Fts5DlidxIter *pDlidx = 0;
+  u64 cksum1 = 13;
+  u64 cksum2 = 13;
+
+  for(pDlidx=fts5DlidxIterInit(p, 0, iSegid, iLeaf);
+      fts5DlidxIterEof(p, pDlidx)==0;
+      fts5DlidxIterNext(p, pDlidx)
+  ){
+    i64 iRowid = fts5DlidxIterRowid(pDlidx);
+    int pgno = fts5DlidxIterPgno(pDlidx);
+    assert( pgno>iLeaf );
+    cksum1 += iRowid + ((i64)pgno<<32);
+  }
+  fts5DlidxIterFree(pDlidx);
+  pDlidx = 0;
+
+  for(pDlidx=fts5DlidxIterInit(p, 1, iSegid, iLeaf);
+      fts5DlidxIterEof(p, pDlidx)==0;
+      fts5DlidxIterPrev(p, pDlidx)
+  ){
+    i64 iRowid = fts5DlidxIterRowid(pDlidx);
+    int pgno = fts5DlidxIterPgno(pDlidx);
+    assert( fts5DlidxIterPgno(pDlidx)>iLeaf );
+    cksum2 += iRowid + ((i64)pgno<<32);
+  }
+  fts5DlidxIterFree(pDlidx);
+  pDlidx = 0;
+
+  if( p->rc==SQLITE_OK && cksum1!=cksum2 ) p->rc = FTS5_CORRUPT;
+}
+
+static int fts5QueryCksum(
+  Fts5Index *p,                   /* Fts5 index object */
+  int iIdx,
+  const char *z,                  /* Index key to query for */
+  int n,                          /* Size of index key in bytes */
+  int flags,                      /* Flags for Fts5IndexQuery */
+  u64 *pCksum                     /* IN/OUT: Checksum value */
+){
+  int eDetail = p->pConfig->eDetail;
+  u64 cksum = *pCksum;
+  Fts5IndexIter *pIter = 0;
+  int rc = sqlite3Fts5IndexQuery(
+      p, z, n, (flags | FTS5INDEX_QUERY_NOTOKENDATA), 0, &pIter
+  );
+
+  while( rc==SQLITE_OK && ALWAYS(pIter!=0) && 0==sqlite3Fts5IterEof(pIter) ){
+    i64 rowid = pIter->iRowid;
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      cksum ^= sqlite3Fts5IndexEntryCksum(rowid, 0, 0, iIdx, z, n);
+    }else{
+      Fts5PoslistReader sReader;
+      for(sqlite3Fts5PoslistReaderInit(pIter->pData, pIter->nData, &sReader);
+          sReader.bEof==0;
+          sqlite3Fts5PoslistReaderNext(&sReader)
+      ){
+        int iCol = FTS5_POS2COLUMN(sReader.iPos);
+        int iOff = FTS5_POS2OFFSET(sReader.iPos);
+        cksum ^= sqlite3Fts5IndexEntryCksum(rowid, iCol, iOff, iIdx, z, n);
+      }
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5IterNext(pIter);
+    }
+  }
+  sqlite3Fts5IterClose(pIter);
+
+  *pCksum = cksum;
+  return rc;
+}
+
+/*
+** Check if buffer z[], size n bytes, contains as series of valid utf-8
+** encoded codepoints. If so, return 0. Otherwise, if the buffer does not
+** contain valid utf-8, return non-zero.
+*/
+static int fts5TestUtf8(const char *z, int n){
+  int i = 0;
+  assert_nc( n>0 );
+  while( i<n ){
+    if( (z[i] & 0x80)==0x00 ){
+      i++;
+    }else
+    if( (z[i] & 0xE0)==0xC0 ){
+      if( i+1>=n || (z[i+1] & 0xC0)!=0x80 ) return 1;
+      i += 2;
+    }else
+    if( (z[i] & 0xF0)==0xE0 ){
+      if( i+2>=n || (z[i+1] & 0xC0)!=0x80 || (z[i+2] & 0xC0)!=0x80 ) return 1;
+      i += 3;
+    }else
+    if( (z[i] & 0xF8)==0xF0 ){
+      if( i+3>=n || (z[i+1] & 0xC0)!=0x80 || (z[i+2] & 0xC0)!=0x80 ) return 1;
+      if( (z[i+2] & 0xC0)!=0x80 ) return 1;
+      i += 3;
+    }else{
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+/*
+** This function is also purely an internal test. It does not contribute to 
+** FTS functionality, or even the integrity-check, in any way.
+*/
+static void fts5TestTerm(
+  Fts5Index *p, 
+  Fts5Buffer *pPrev,              /* Previous term */
+  const char *z, int n,           /* Possibly new term to test */
+  u64 expected,
+  u64 *pCksum
+){
+  int rc = p->rc;
+  if( pPrev->n==0 ){
+    fts5BufferSet(&rc, pPrev, n, (const u8*)z);
+  }else
+  if( rc==SQLITE_OK && (pPrev->n!=n || memcmp(pPrev->p, z, n)) ){
+    u64 cksum3 = *pCksum;
+    const char *zTerm = (const char*)&pPrev->p[1];  /* term sans prefix-byte */
+    int nTerm = pPrev->n-1;            /* Size of zTerm in bytes */
+    int iIdx = (pPrev->p[0] - FTS5_MAIN_PREFIX);
+    int flags = (iIdx==0 ? 0 : FTS5INDEX_QUERY_PREFIX);
+    u64 ck1 = 0;
+    u64 ck2 = 0;
+
+    /* Check that the results returned for ASC and DESC queries are
+    ** the same. If not, call this corruption.  */
+    rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, flags, &ck1);
+    if( rc==SQLITE_OK ){
+      int f = flags|FTS5INDEX_QUERY_DESC;
+      rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, f, &ck2);
+    }
+    if( rc==SQLITE_OK && ck1!=ck2 ) rc = FTS5_CORRUPT;
+
+    /* If this is a prefix query, check that the results returned if the
+    ** the index is disabled are the same. In both ASC and DESC order. 
+    **
+    ** This check may only be performed if the hash table is empty. This
+    ** is because the hash table only supports a single scan query at
+    ** a time, and the multi-iter loop from which this function is called
+    ** is already performing such a scan. 
+    **
+    ** Also only do this if buffer zTerm contains nTerm bytes of valid
+    ** utf-8. Otherwise, the last part of the buffer contents might contain
+    ** a non-utf-8 sequence that happens to be a prefix of a valid utf-8
+    ** character stored in the main fts index, which will cause the
+    ** test to fail.  */
+    if( p->nPendingData==0 && 0==fts5TestUtf8(zTerm, nTerm) ){
+      if( iIdx>0 && rc==SQLITE_OK ){
+        int f = flags|FTS5INDEX_QUERY_TEST_NOIDX;
+        ck2 = 0;
+        rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, f, &ck2);
+        if( rc==SQLITE_OK && ck1!=ck2 ) rc = FTS5_CORRUPT;
+      }
+      if( iIdx>0 && rc==SQLITE_OK ){
+        int f = flags|FTS5INDEX_QUERY_TEST_NOIDX|FTS5INDEX_QUERY_DESC;
+        ck2 = 0;
+        rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, f, &ck2);
+        if( rc==SQLITE_OK && ck1!=ck2 ) rc = FTS5_CORRUPT;
+      }
+    }
+
+    cksum3 ^= ck1;
+    fts5BufferSet(&rc, pPrev, n, (const u8*)z);
+
+    if( rc==SQLITE_OK && cksum3!=expected ){
+      rc = FTS5_CORRUPT;
+    }
+    *pCksum = cksum3;
+  }
+  p->rc = rc;
+}
+ 
+#else
+# define fts5TestDlidxReverse(x,y,z)
+# define fts5TestTerm(u,v,w,x,y,z)
+#endif
+
+/*
+** Check that:
+**
+**   1) All leaves of pSeg between iFirst and iLast (inclusive) exist and
+**      contain zero terms.
+**   2) All leaves of pSeg between iNoRowid and iLast (inclusive) exist and
+**      contain zero rowids.
+*/
+static void fts5IndexIntegrityCheckEmpty(
+  Fts5Index *p,
+  Fts5StructureSegment *pSeg,     /* Segment to check internal consistency */
+  int iFirst,
+  int iNoRowid,
+  int iLast
+){
+  int i;
+
+  /* Now check that the iter.nEmpty leaves following the current leaf
+  ** (a) exist and (b) contain no terms. */
+  for(i=iFirst; p->rc==SQLITE_OK && i<=iLast; i++){
+    Fts5Data *pLeaf = fts5DataRead(p, FTS5_SEGMENT_ROWID(pSeg->iSegid, i));
+    if( pLeaf ){
+      if( !fts5LeafIsTermless(pLeaf) ) p->rc = FTS5_CORRUPT;
+      if( i>=iNoRowid && 0!=fts5LeafFirstRowidOff(pLeaf) ) p->rc = FTS5_CORRUPT;
+    }
+    fts5DataRelease(pLeaf);
+  }
+}
+
+static void fts5IntegrityCheckPgidx(Fts5Index *p, Fts5Data *pLeaf){
+  i64 iTermOff = 0;
+  int ii;
+
+  Fts5Buffer buf1 = {0,0,0};
+  Fts5Buffer buf2 = {0,0,0};
+
+  ii = pLeaf->szLeaf;
+  while( ii<pLeaf->nn && p->rc==SQLITE_OK ){
+    int res;
+    i64 iOff;
+    int nIncr;
+
+    ii += fts5GetVarint32(&pLeaf->p[ii], nIncr);
+    iTermOff += nIncr;
+    iOff = iTermOff;
+
+    if( iOff>=pLeaf->szLeaf ){
+      p->rc = FTS5_CORRUPT;
+    }else if( iTermOff==nIncr ){
+      int nByte;
+      iOff += fts5GetVarint32(&pLeaf->p[iOff], nByte);
+      if( (iOff+nByte)>pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        fts5BufferSet(&p->rc, &buf1, nByte, &pLeaf->p[iOff]);
+      }
+    }else{
+      int nKeep, nByte;
+      iOff += fts5GetVarint32(&pLeaf->p[iOff], nKeep);
+      iOff += fts5GetVarint32(&pLeaf->p[iOff], nByte);
+      if( nKeep>buf1.n || (iOff+nByte)>pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        buf1.n = nKeep;
+        fts5BufferAppendBlob(&p->rc, &buf1, nByte, &pLeaf->p[iOff]);
+      }
+
+      if( p->rc==SQLITE_OK ){
+        res = fts5BufferCompare(&buf1, &buf2);
+        if( res<=0 ) p->rc = FTS5_CORRUPT;
+      }
+    }
+    fts5BufferSet(&p->rc, &buf2, buf1.n, buf1.p);
+  }
+
+  fts5BufferFree(&buf1);
+  fts5BufferFree(&buf2);
+}
+
+static void fts5IndexIntegrityCheckSegment(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5StructureSegment *pSeg      /* Segment to check internal consistency */
+){
+  Fts5Config *pConfig = p->pConfig;
+  int bSecureDelete = (pConfig->iVersion==FTS5_CURRENT_VERSION_SECUREDELETE);
+  sqlite3_stmt *pStmt = 0;
+  int rc2;
+  int iIdxPrevLeaf = pSeg->pgnoFirst-1;
+  int iDlidxPrevLeaf = pSeg->pgnoLast;
+
+  if( pSeg->pgnoFirst==0 ) return;
+
+  fts5IndexPrepareStmt(p, &pStmt, sqlite3_mprintf(
+      "SELECT segid, term, (pgno>>1), (pgno&1) FROM %Q.'%q_idx' WHERE segid=%d "
+      "ORDER BY 1, 2",
+      pConfig->zDb, pConfig->zName, pSeg->iSegid
+  ));
+
+  /* Iterate through the b-tree hierarchy.  */
+  while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+    i64 iRow;                     /* Rowid for this leaf */
+    Fts5Data *pLeaf;              /* Data for this leaf */
+
+    const char *zIdxTerm = (const char*)sqlite3_column_blob(pStmt, 1);
+    int nIdxTerm = sqlite3_column_bytes(pStmt, 1);
+    int iIdxLeaf = sqlite3_column_int(pStmt, 2);
+    int bIdxDlidx = sqlite3_column_int(pStmt, 3);
+
+    /* If the leaf in question has already been trimmed from the segment, 
+    ** ignore this b-tree entry. Otherwise, load it into memory. */
+    if( iIdxLeaf<pSeg->pgnoFirst ) continue;
+    iRow = FTS5_SEGMENT_ROWID(pSeg->iSegid, iIdxLeaf);
+    pLeaf = fts5LeafRead(p, iRow);
+    if( pLeaf==0 ) break;
+
+    /* Check that the leaf contains at least one term, and that it is equal
+    ** to or larger than the split-key in zIdxTerm.  Also check that if there
+    ** is also a rowid pointer within the leaf page header, it points to a
+    ** location before the term.  */
+    if( pLeaf->nn<=pLeaf->szLeaf ){
+
+      if( nIdxTerm==0 
+       && pConfig->iVersion==FTS5_CURRENT_VERSION_SECUREDELETE
+       && pLeaf->nn==pLeaf->szLeaf
+       && pLeaf->nn==4
+      ){
+        /* special case - the very first page in a segment keeps its %_idx
+        ** entry even if all the terms are removed from it by secure-delete 
+        ** operations. */
+      }else{
+        p->rc = FTS5_CORRUPT;
+      }
+
+    }else{
+      int iOff;                   /* Offset of first term on leaf */
+      int iRowidOff;              /* Offset of first rowid on leaf */
+      int nTerm;                  /* Size of term on leaf in bytes */
+      int res;                    /* Comparison of term and split-key */
+
+      iOff = fts5LeafFirstTermOff(pLeaf);
+      iRowidOff = fts5LeafFirstRowidOff(pLeaf);
+      if( iRowidOff>=iOff || iOff>=pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        iOff += fts5GetVarint32(&pLeaf->p[iOff], nTerm);
+        res = fts5Memcmp(&pLeaf->p[iOff], zIdxTerm, MIN(nTerm, nIdxTerm));
+        if( res==0 ) res = nTerm - nIdxTerm;
+        if( res<0 ) p->rc = FTS5_CORRUPT;
+      }
+
+      fts5IntegrityCheckPgidx(p, pLeaf);
+    }
+    fts5DataRelease(pLeaf);
+    if( p->rc ) break;
+
+    /* Now check that the iter.nEmpty leaves following the current leaf
+    ** (a) exist and (b) contain no terms. */
+    fts5IndexIntegrityCheckEmpty(
+        p, pSeg, iIdxPrevLeaf+1, iDlidxPrevLeaf+1, iIdxLeaf-1
+    );
+    if( p->rc ) break;
+
+    /* If there is a doclist-index, check that it looks right. */
+    if( bIdxDlidx ){
+      Fts5DlidxIter *pDlidx = 0;  /* For iterating through doclist index */
+      int iPrevLeaf = iIdxLeaf;
+      int iSegid = pSeg->iSegid;
+      int iPg = 0;
+      i64 iKey;
+
+      for(pDlidx=fts5DlidxIterInit(p, 0, iSegid, iIdxLeaf);
+          fts5DlidxIterEof(p, pDlidx)==0;
+          fts5DlidxIterNext(p, pDlidx)
+      ){
+
+        /* Check any rowid-less pages that occur before the current leaf. */
+        for(iPg=iPrevLeaf+1; iPg<fts5DlidxIterPgno(pDlidx); iPg++){
+          iKey = FTS5_SEGMENT_ROWID(iSegid, iPg);
+          pLeaf = fts5DataRead(p, iKey);
+          if( pLeaf ){
+            if( fts5LeafFirstRowidOff(pLeaf)!=0 ) p->rc = FTS5_CORRUPT;
+            fts5DataRelease(pLeaf);
+          }
+        }
+        iPrevLeaf = fts5DlidxIterPgno(pDlidx);
+
+        /* Check that the leaf page indicated by the iterator really does
+        ** contain the rowid suggested by the same. */
+        iKey = FTS5_SEGMENT_ROWID(iSegid, iPrevLeaf);
+        pLeaf = fts5DataRead(p, iKey);
+        if( pLeaf ){
+          i64 iRowid;
+          int iRowidOff = fts5LeafFirstRowidOff(pLeaf);
+          ASSERT_SZLEAF_OK(pLeaf);
+          if( iRowidOff>=pLeaf->szLeaf ){
+            p->rc = FTS5_CORRUPT;
+          }else if( bSecureDelete==0 || iRowidOff>0 ){
+            i64 iDlRowid = fts5DlidxIterRowid(pDlidx);
+            fts5GetVarint(&pLeaf->p[iRowidOff], (u64*)&iRowid);
+            if( iRowid<iDlRowid || (bSecureDelete==0 && iRowid!=iDlRowid) ){
+              p->rc = FTS5_CORRUPT;
+            }
+          }
+          fts5DataRelease(pLeaf);
+        }
+      }
+
+      iDlidxPrevLeaf = iPg;
+      fts5DlidxIterFree(pDlidx);
+      fts5TestDlidxReverse(p, iSegid, iIdxLeaf);
+    }else{
+      iDlidxPrevLeaf = pSeg->pgnoLast;
+      /* TODO: Check there is no doclist index */
+    }
+
+    iIdxPrevLeaf = iIdxLeaf;
+  }
+
+  rc2 = sqlite3_finalize(pStmt);
+  if( p->rc==SQLITE_OK ) p->rc = rc2;
+
+  /* Page iter.iLeaf must now be the rightmost leaf-page in the segment */
+#if 0
+  if( p->rc==SQLITE_OK && iter.iLeaf!=pSeg->pgnoLast ){
+    p->rc = FTS5_CORRUPT;
+  }
+#endif
+}
+
+
+/*
+** Run internal checks to ensure that the FTS index (a) is internally 
+** consistent and (b) contains entries for which the XOR of the checksums
+** as calculated by sqlite3Fts5IndexEntryCksum() is cksum.
+**
+** Return SQLITE_CORRUPT if any of the internal checks fail, or if the
+** checksum does not match. Return SQLITE_OK if all checks pass without
+** error, or some other SQLite error code if another error (e.g. OOM)
+** occurs.
+*/
+static int sqlite3Fts5IndexIntegrityCheck(Fts5Index *p, u64 cksum, int bUseCksum){
+  int eDetail = p->pConfig->eDetail;
+  u64 cksum2 = 0;                 /* Checksum based on contents of indexes */
+  Fts5Buffer poslist = {0,0,0};   /* Buffer used to hold a poslist */
+  Fts5Iter *pIter;                /* Used to iterate through entire index */
+  Fts5Structure *pStruct;         /* Index structure */
+  int iLvl, iSeg;
+
+#ifdef SQLITE_DEBUG
+  /* Used by extra internal tests only run if NDEBUG is not defined */
+  u64 cksum3 = 0;                 /* Checksum based on contents of indexes */
+  Fts5Buffer term = {0,0,0};      /* Buffer used to hold most recent term */
+#endif
+  const int flags = FTS5INDEX_QUERY_NOOUTPUT;
+  
+  /* Load the FTS index structure */
+  pStruct = fts5StructureRead(p);
+  if( pStruct==0 ){
+    assert( p->rc!=SQLITE_OK );
+    return fts5IndexReturn(p);
+  }
+
+  /* Check that the internal nodes of each segment match the leaves */
+  for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+    for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+      Fts5StructureSegment *pSeg = &pStruct->aLevel[iLvl].aSeg[iSeg];
+      fts5IndexIntegrityCheckSegment(p, pSeg);
+    }
+  }
+
+  /* The cksum argument passed to this function is a checksum calculated
+  ** based on all expected entries in the FTS index (including prefix index
+  ** entries). This block checks that a checksum calculated based on the
+  ** actual contents of FTS index is identical.
+  **
+  ** Two versions of the same checksum are calculated. The first (stack
+  ** variable cksum2) based on entries extracted from the full-text index
+  ** while doing a linear scan of each individual index in turn. 
+  **
+  ** As each term visited by the linear scans, a separate query for the
+  ** same term is performed. cksum3 is calculated based on the entries
+  ** extracted by these queries.
+  */
+  for(fts5MultiIterNew(p, pStruct, flags, 0, 0, 0, -1, 0, &pIter);
+      fts5MultiIterEof(p, pIter)==0;
+      fts5MultiIterNext(p, pIter, 0, 0)
+  ){
+    int n;                      /* Size of term in bytes */
+    i64 iPos = 0;               /* Position read from poslist */
+    int iOff = 0;               /* Offset within poslist */
+    i64 iRowid = fts5MultiIterRowid(pIter);
+    char *z = (char*)fts5MultiIterTerm(pIter, &n);
+
+    /* If this is a new term, query for it. Update cksum3 with the results. */
+    fts5TestTerm(p, &term, z, n, cksum2, &cksum3);
+    if( p->rc ) break;
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      if( 0==fts5MultiIterIsEmpty(p, pIter) ){
+        cksum2 ^= sqlite3Fts5IndexEntryCksum(iRowid, 0, 0, -1, z, n);
+      }
+    }else{
+      poslist.n = 0;
+      fts5SegiterPoslist(p, &pIter->aSeg[pIter->aFirst[1].iFirst], 0, &poslist);
+      fts5BufferAppendBlob(&p->rc, &poslist, 4, (const u8*)"\0\0\0\0");
+      while( 0==sqlite3Fts5PoslistNext64(poslist.p, poslist.n, &iOff, &iPos) ){
+        int iCol = FTS5_POS2COLUMN(iPos);
+        int iTokOff = FTS5_POS2OFFSET(iPos);
+        cksum2 ^= sqlite3Fts5IndexEntryCksum(iRowid, iCol, iTokOff, -1, z, n);
+      }
+    }
+  }
+  fts5TestTerm(p, &term, 0, 0, cksum2, &cksum3);
+
+  fts5MultiIterFree(pIter);
+  if( p->rc==SQLITE_OK && bUseCksum && cksum!=cksum2 ) p->rc = FTS5_CORRUPT;
+
+  fts5StructureRelease(pStruct);
+#ifdef SQLITE_DEBUG
+  fts5BufferFree(&term);
+#endif
+  fts5BufferFree(&poslist);
+  return fts5IndexReturn(p);
+}
+
+/*************************************************************************
+**************************************************************************
+** Below this point is the implementation of the fts5_decode() scalar
+** function only.
+*/
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+/*
+** Decode a segment-data rowid from the %_data table. This function is
+** the opposite of macro FTS5_SEGMENT_ROWID().
+*/
+static void fts5DecodeRowid(
+  i64 iRowid,                     /* Rowid from %_data table */
+  int *pbTombstone,               /* OUT: Tombstone hash flag */
+  int *piSegid,                   /* OUT: Segment id */
+  int *pbDlidx,                   /* OUT: Dlidx flag */
+  int *piHeight,                  /* OUT: Height */
+  int *piPgno                     /* OUT: Page number */
+){
+  *piPgno = (int)(iRowid & (((i64)1 << FTS5_DATA_PAGE_B) - 1));
+  iRowid >>= FTS5_DATA_PAGE_B;
+
+  *piHeight = (int)(iRowid & (((i64)1 << FTS5_DATA_HEIGHT_B) - 1));
+  iRowid >>= FTS5_DATA_HEIGHT_B;
+
+  *pbDlidx = (int)(iRowid & 0x0001);
+  iRowid >>= FTS5_DATA_DLI_B;
+
+  *piSegid = (int)(iRowid & (((i64)1 << FTS5_DATA_ID_B) - 1));
+  iRowid >>= FTS5_DATA_ID_B;
+
+  *pbTombstone = (int)(iRowid & 0x0001);
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+static void fts5DebugRowid(int *pRc, Fts5Buffer *pBuf, i64 iKey){
+  int iSegid, iHeight, iPgno, bDlidx, bTomb;     /* Rowid compenents */
+  fts5DecodeRowid(iKey, &bTomb, &iSegid, &bDlidx, &iHeight, &iPgno);
+
+  if( iSegid==0 ){
+    if( iKey==FTS5_AVERAGES_ROWID ){
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "{averages} ");
+    }else{
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "{structure}");
+    }
+  }
+  else{
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "{%s%ssegid=%d h=%d pgno=%d}",
+        bDlidx ? "dlidx " : "", 
+        bTomb ? "tombstone " : "", 
+        iSegid, iHeight, iPgno
+    );
+  }
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+static void fts5DebugStructure(
+  int *pRc,                       /* IN/OUT: error code */
+  Fts5Buffer *pBuf,
+  Fts5Structure *p
+){
+  int iLvl, iSeg;                 /* Iterate through levels, segments */
+
+  for(iLvl=0; iLvl<p->nLevel; iLvl++){
+    Fts5StructureLevel *pLvl = &p->aLevel[iLvl];
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, 
+        " {lvl=%d nMerge=%d nSeg=%d", iLvl, pLvl->nMerge, pLvl->nSeg
+    );
+    for(iSeg=0; iSeg<pLvl->nSeg; iSeg++){
+      Fts5StructureSegment *pSeg = &pLvl->aSeg[iSeg];
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " {id=%d leaves=%d..%d",
+          pSeg->iSegid, pSeg->pgnoFirst, pSeg->pgnoLast
+      );
+      if( pSeg->iOrigin1>0 ){
+        sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " origin=%lld..%lld",
+            pSeg->iOrigin1, pSeg->iOrigin2
+        );
+      }
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "}");
+    }
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "}");
+  }
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+/*
+** This is part of the fts5_decode() debugging aid.
+**
+** Arguments pBlob/nBlob contain a serialized Fts5Structure object. This
+** function appends a human-readable representation of the same object
+** to the buffer passed as the second argument. 
+*/
+static void fts5DecodeStructure(
+  int *pRc,                       /* IN/OUT: error code */
+  Fts5Buffer *pBuf,
+  const u8 *pBlob, int nBlob
+){
+  int rc;                         /* Return code */
+  Fts5Structure *p = 0;           /* Decoded structure object */
+
+  rc = fts5StructureDecode(pBlob, nBlob, 0, &p);
+  if( rc!=SQLITE_OK ){
+    *pRc = rc;
+    return;
+  }
+
+  fts5DebugStructure(pRc, pBuf, p);
+  fts5StructureRelease(p);
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+/*
+** This is part of the fts5_decode() debugging aid.
+**
+** Arguments pBlob/nBlob contain an "averages" record. This function 
+** appends a human-readable representation of record to the buffer passed 
+** as the second argument. 
+*/
+static void fts5DecodeAverages(
+  int *pRc,                       /* IN/OUT: error code */
+  Fts5Buffer *pBuf,
+  const u8 *pBlob, int nBlob
+){
+  int i = 0;
+  const char *zSpace = "";
+
+  while( i<nBlob ){
+    u64 iVal;
+    i += sqlite3Fts5GetVarint(&pBlob[i], &iVal);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "%s%d", zSpace, (int)iVal);
+    zSpace = " ";
+  }
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+/*
+** Buffer (a/n) is assumed to contain a list of serialized varints. Read
+** each varint and append its string representation to buffer pBuf. Return
+** after either the input buffer is exhausted or a 0 value is read.
+**
+** The return value is the number of bytes read from the input buffer.
+*/
+static int fts5DecodePoslist(int *pRc, Fts5Buffer *pBuf, const u8 *a, int n){
+  int iOff = 0;
+  while( iOff<n ){
+    int iVal;
+    iOff += fts5GetVarint32(&a[iOff], iVal);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " %d", iVal);
+  }
+  return iOff;
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+/*
+** The start of buffer (a/n) contains the start of a doclist. The doclist
+** may or may not finish within the buffer. This function appends a text
+** representation of the part of the doclist that is present to buffer
+** pBuf. 
+**
+** The return value is the number of bytes read from the input buffer.
+*/
+static int fts5DecodeDoclist(int *pRc, Fts5Buffer *pBuf, const u8 *a, int n){
+  i64 iDocid = 0;
+  int iOff = 0;
+
+  if( n>0 ){
+    iOff = sqlite3Fts5GetVarint(a, (u64*)&iDocid);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " id=%lld", iDocid);
+  }
+  while( iOff<n ){
+    int nPos;
+    int bDel;
+    iOff += fts5GetPoslistSize(&a[iOff], &nPos, &bDel);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " nPos=%d%s", nPos, bDel?"*":"");
+    iOff += fts5DecodePoslist(pRc, pBuf, &a[iOff], MIN(n-iOff, nPos));
+    if( iOff<n ){
+      i64 iDelta;
+      iOff += sqlite3Fts5GetVarint(&a[iOff], (u64*)&iDelta);
+      iDocid += iDelta;
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " id=%lld", iDocid);
+    }
+  }
+
+  return iOff;
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+/*
+** This function is part of the fts5_decode() debugging function. It is 
+** only ever used with detail=none tables.
+**
+** Buffer (pData/nData) contains a doclist in the format used by detail=none
+** tables. This function appends a human-readable version of that list to
+** buffer pBuf.
+**
+** If *pRc is other than SQLITE_OK when this function is called, it is a
+** no-op. If an OOM or other error occurs within this function, *pRc is
+** set to an SQLite error code before returning. The final state of buffer
+** pBuf is undefined in this case.
+*/
+static void fts5DecodeRowidList(
+  int *pRc,                       /* IN/OUT: Error code */
+  Fts5Buffer *pBuf,               /* Buffer to append text to */
+  const u8 *pData, int nData      /* Data to decode list-of-rowids from */
+){
+  int i = 0;
+  i64 iRowid = 0;
+
+  while( i<nData ){
+    const char *zApp = "";
+    u64 iVal;
+    i += sqlite3Fts5GetVarint(&pData[i], &iVal);
+    iRowid += iVal;
+
+    if( i<nData && pData[i]==0x00 ){
+      i++;
+      if( i<nData && pData[i]==0x00 ){
+        i++;
+        zApp = "+";
+      }else{
+        zApp = "*";
+      }
+    }
+
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " %lld%s", iRowid, zApp);
+  }
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+static void fts5BufferAppendTerm(int *pRc, Fts5Buffer *pBuf, Fts5Buffer *pTerm){
+  int ii;
+  fts5BufferGrow(pRc, pBuf, pTerm->n*2 + 1);
+  if( *pRc==SQLITE_OK ){
+    for(ii=0; ii<pTerm->n; ii++){
+      if( pTerm->p[ii]==0x00 ){
+        pBuf->p[pBuf->n++] = '\\';
+        pBuf->p[pBuf->n++] = '0';
+      }else{
+        pBuf->p[pBuf->n++] = pTerm->p[ii];
+      }
+    }
+    pBuf->p[pBuf->n] = 0x00;
+  }
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+/*
+** The implementation of user-defined scalar function fts5_decode().
+*/
+static void fts5DecodeFunction(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args (always 2) */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  i64 iRowid;                     /* Rowid for record being decoded */
+  int iSegid,iHeight,iPgno,bDlidx;/* Rowid components */
+  int bTomb;
+  const u8 *aBlob; int n;         /* Record to decode */
+  u8 *a = 0;
+  Fts5Buffer s;                   /* Build up text to return here */
+  int rc = SQLITE_OK;             /* Return code */
+  sqlite3_int64 nSpace = 0;
+  int eDetailNone = (sqlite3_user_data(pCtx)!=0);
+
+  assert( nArg==2 );
+  UNUSED_PARAM(nArg);
+  memset(&s, 0, sizeof(Fts5Buffer));
+  iRowid = sqlite3_value_int64(apVal[0]);
+
+  /* Make a copy of the second argument (a blob) in aBlob[]. The aBlob[]
+  ** copy is followed by FTS5_DATA_ZERO_PADDING 0x00 bytes, which prevents
+  ** buffer overreads even if the record is corrupt.  */
+  n = sqlite3_value_bytes(apVal[1]);
+  aBlob = sqlite3_value_blob(apVal[1]);
+  nSpace = n + FTS5_DATA_ZERO_PADDING;
+  a = (u8*)sqlite3Fts5MallocZero(&rc, nSpace);
+  if( a==0 ) goto decode_out;
+  if( n>0 ) memcpy(a, aBlob, n);
+
+  fts5DecodeRowid(iRowid, &bTomb, &iSegid, &bDlidx, &iHeight, &iPgno);
+
+  fts5DebugRowid(&rc, &s, iRowid);
+  if( bDlidx ){
+    Fts5Data dlidx;
+    Fts5DlidxLvl lvl;
+
+    dlidx.p = a;
+    dlidx.nn = n;
+
+    memset(&lvl, 0, sizeof(Fts5DlidxLvl));
+    lvl.pData = &dlidx;
+    lvl.iLeafPgno = iPgno;
+
+    for(fts5DlidxLvlNext(&lvl); lvl.bEof==0; fts5DlidxLvlNext(&lvl)){
+      sqlite3Fts5BufferAppendPrintf(&rc, &s, 
+          " %d(%lld)", lvl.iLeafPgno, lvl.iRowid
+      );
+    }
+  }else if( bTomb ){
+    u32 nElem  = fts5GetU32(&a[4]);
+    int szKey = (aBlob[0]==4 || aBlob[0]==8) ? aBlob[0] : 8;
+    int nSlot = (n - 8) / szKey;
+    int ii;
+    sqlite3Fts5BufferAppendPrintf(&rc, &s, " nElem=%d", (int)nElem);
+    if( aBlob[1] ){
+      sqlite3Fts5BufferAppendPrintf(&rc, &s, " 0");
+    }
+    for(ii=0; ii<nSlot; ii++){
+      u64 iVal = 0;
+      if( szKey==4 ){
+        u32 *aSlot = (u32*)&aBlob[8];
+        if( aSlot[ii] ) iVal = fts5GetU32((u8*)&aSlot[ii]);
+      }else{
+        u64 *aSlot = (u64*)&aBlob[8];
+        if( aSlot[ii] ) iVal = fts5GetU64((u8*)&aSlot[ii]);
+      }
+      if( iVal!=0 ){
+        sqlite3Fts5BufferAppendPrintf(&rc, &s, " %lld", (i64)iVal);
+      }
+    }
+  }else if( iSegid==0 ){
+    if( iRowid==FTS5_AVERAGES_ROWID ){
+      fts5DecodeAverages(&rc, &s, a, n);
+    }else{
+      fts5DecodeStructure(&rc, &s, a, n);
+    }
+  }else if( eDetailNone ){
+    Fts5Buffer term;              /* Current term read from page */
+    int szLeaf;
+    int iPgidxOff = szLeaf = fts5GetU16(&a[2]);
+    int iTermOff;
+    int nKeep = 0;
+    int iOff;
+
+    memset(&term, 0, sizeof(Fts5Buffer));
+
+    /* Decode any entries that occur before the first term. */
+    if( szLeaf<n ){
+      iPgidxOff += fts5GetVarint32(&a[iPgidxOff], iTermOff);
+    }else{
+      iTermOff = szLeaf;
+    }
+    fts5DecodeRowidList(&rc, &s, &a[4], iTermOff-4);
+
+    iOff = iTermOff;
+    while( iOff<szLeaf && rc==SQLITE_OK ){
+      int nAppend;
+
+      /* Read the term data for the next term*/
+      iOff += fts5GetVarint32(&a[iOff], nAppend);
+      term.n = nKeep;
+      fts5BufferAppendBlob(&rc, &term, nAppend, &a[iOff]);
+      sqlite3Fts5BufferAppendPrintf(&rc, &s, " term=");
+      fts5BufferAppendTerm(&rc, &s, &term);
+      iOff += nAppend;
+
+      /* Figure out where the doclist for this term ends */
+      if( iPgidxOff<n ){
+        int nIncr;
+        iPgidxOff += fts5GetVarint32(&a[iPgidxOff], nIncr);
+        iTermOff += nIncr;
+      }else{
+        iTermOff = szLeaf;
+      }
+      if( iTermOff>szLeaf ){
+        rc = FTS5_CORRUPT;
+      }else{
+        fts5DecodeRowidList(&rc, &s, &a[iOff], iTermOff-iOff);
+      }
+      iOff = iTermOff;
+      if( iOff<szLeaf ){
+        iOff += fts5GetVarint32(&a[iOff], nKeep);
+      }
+    }
+
+    fts5BufferFree(&term);
+  }else{
+    Fts5Buffer term;              /* Current term read from page */
+    int szLeaf;                   /* Offset of pgidx in a[] */
+    int iPgidxOff;
+    int iPgidxPrev = 0;           /* Previous value read from pgidx */
+    int iTermOff = 0;
+    int iRowidOff = 0;
+    int iOff;
+    int nDoclist;
+
+    memset(&term, 0, sizeof(Fts5Buffer));
+
+    if( n<4 ){
+      sqlite3Fts5BufferSet(&rc, &s, 7, (const u8*)"corrupt");
+      goto decode_out;
+    }else{
+      iRowidOff = fts5GetU16(&a[0]);
+      iPgidxOff = szLeaf = fts5GetU16(&a[2]);
+      if( iPgidxOff<n ){
+        fts5GetVarint32(&a[iPgidxOff], iTermOff);
+      }else if( iPgidxOff>n ){
+        rc = FTS5_CORRUPT;
+        goto decode_out;
+      }
+    }
+
+    /* Decode the position list tail at the start of the page */
+    if( iRowidOff!=0 ){
+      iOff = iRowidOff;
+    }else if( iTermOff!=0 ){
+      iOff = iTermOff;
+    }else{
+      iOff = szLeaf;
+    }
+    if( iOff>n ){
+      rc = FTS5_CORRUPT;
+      goto decode_out;
+    }
+    fts5DecodePoslist(&rc, &s, &a[4], iOff-4);
+
+    /* Decode any more doclist data that appears on the page before the
+    ** first term. */
+    nDoclist = (iTermOff ? iTermOff : szLeaf) - iOff;
+    if( nDoclist+iOff>n ){
+      rc = FTS5_CORRUPT;
+      goto decode_out;
+    }
+    fts5DecodeDoclist(&rc, &s, &a[iOff], nDoclist);
+
+    while( iPgidxOff<n && rc==SQLITE_OK ){
+      int bFirst = (iPgidxOff==szLeaf);     /* True for first term on page */
+      int nByte;                            /* Bytes of data */
+      int iEnd;
+      
+      iPgidxOff += fts5GetVarint32(&a[iPgidxOff], nByte);
+      iPgidxPrev += nByte;
+      iOff = iPgidxPrev;
+
+      if( iPgidxOff<n ){
+        fts5GetVarint32(&a[iPgidxOff], nByte);
+        iEnd = iPgidxPrev + nByte;
+      }else{
+        iEnd = szLeaf;
+      }
+      if( iEnd>szLeaf ){
+        rc = FTS5_CORRUPT;
+        break;
+      }
+
+      if( bFirst==0 ){
+        iOff += fts5GetVarint32(&a[iOff], nByte);
+        if( nByte>term.n ){
+          rc = FTS5_CORRUPT;
+          break;
+        }
+        term.n = nByte;
+      }
+      iOff += fts5GetVarint32(&a[iOff], nByte);
+      if( iOff+nByte>n ){
+        rc = FTS5_CORRUPT;
+        break;
+      }
+      fts5BufferAppendBlob(&rc, &term, nByte, &a[iOff]);
+      iOff += nByte;
+
+      sqlite3Fts5BufferAppendPrintf(&rc, &s, " term=");
+      fts5BufferAppendTerm(&rc, &s, &term);
+      iOff += fts5DecodeDoclist(&rc, &s, &a[iOff], iEnd-iOff);
+    }
+
+    fts5BufferFree(&term);
+  }
+  
+ decode_out:
+  sqlite3_free(a);
+  if( rc==SQLITE_OK ){
+    sqlite3_result_text(pCtx, (const char*)s.p, s.n, SQLITE_TRANSIENT);
+  }else{
+    sqlite3_result_error_code(pCtx, rc);
+  }
+  fts5BufferFree(&s);
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG) 
+/*
+** The implementation of user-defined scalar function fts5_rowid().
+*/
+static void fts5RowidFunction(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args (always 2) */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  const char *zArg;
+  if( nArg==0 ){
+    sqlite3_result_error(pCtx, "should be: fts5_rowid(subject, ....)", -1);
+  }else{
+    zArg = (const char*)sqlite3_value_text(apVal[0]);
+    if( 0==sqlite3_stricmp(zArg, "segment") ){
+      i64 iRowid;
+      int segid, pgno;
+      if( nArg!=3 ){
+        sqlite3_result_error(pCtx, 
+            "should be: fts5_rowid('segment', segid, pgno))", -1
+        );
+      }else{
+        segid = sqlite3_value_int(apVal[1]);
+        pgno = sqlite3_value_int(apVal[2]);
+        iRowid = FTS5_SEGMENT_ROWID(segid, pgno);
+        sqlite3_result_int64(pCtx, iRowid);
+      }
+    }else{
+      sqlite3_result_error(pCtx, 
+        "first arg to fts5_rowid() must be 'segment'" , -1
+      );
+    }
+  }
+}
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+
+typedef struct Fts5StructVtab Fts5StructVtab;
+struct Fts5StructVtab {
+  sqlite3_vtab base;
+};
+
+typedef struct Fts5StructVcsr Fts5StructVcsr;
+struct Fts5StructVcsr {
+  sqlite3_vtab_cursor base;
+  Fts5Structure *pStruct;
+  int iLevel;
+  int iSeg;
+  int iRowid;
+};
+
+/*
+** Create a new fts5_structure() table-valued function.
+*/
+static int fts5structConnectMethod(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  Fts5StructVtab *pNew = 0;
+  int rc = SQLITE_OK;
+
+  rc = sqlite3_declare_vtab(db, 
+      "CREATE TABLE xyz("
+          "level, segment, merge, segid, leaf1, leaf2, loc1, loc2, "
+          "npgtombstone, nentrytombstone, nentry, struct HIDDEN);"
+  );
+  if( rc==SQLITE_OK ){
+    pNew = sqlite3Fts5MallocZero(&rc, sizeof(*pNew));
+  }
+
+  *ppVtab = (sqlite3_vtab*)pNew;
+  return rc;
+}
+
+/*
+** We must have a single struct=? constraint that will be passed through
+** into the xFilter method.  If there is no valid stmt=? constraint,
+** then return an SQLITE_CONSTRAINT error.
+*/
+static int fts5structBestIndexMethod(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  int i;
+  int rc = SQLITE_CONSTRAINT;
+  struct sqlite3_index_constraint *p;
+  pIdxInfo->estimatedCost = (double)100;
+  pIdxInfo->estimatedRows = 100;
+  pIdxInfo->idxNum = 0;
+  for(i=0, p=pIdxInfo->aConstraint; i<pIdxInfo->nConstraint; i++, p++){
+    if( p->usable==0 ) continue;
+    if( p->op==SQLITE_INDEX_CONSTRAINT_EQ && p->iColumn==11 ){
+      rc = SQLITE_OK;
+      pIdxInfo->aConstraintUsage[i].omit = 1;
+      pIdxInfo->aConstraintUsage[i].argvIndex = 1;
+      break;
+    }
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for bytecodevtab objects.
+*/
+static int fts5structDisconnectMethod(sqlite3_vtab *pVtab){
+  Fts5StructVtab *p = (Fts5StructVtab*)pVtab;
+  sqlite3_free(p);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new bytecodevtab_cursor object.
+*/
+static int fts5structOpenMethod(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCsr){
+  int rc = SQLITE_OK;
+  Fts5StructVcsr *pNew = 0;
+
+  pNew = sqlite3Fts5MallocZero(&rc, sizeof(*pNew));
+  *ppCsr = (sqlite3_vtab_cursor*)pNew;
+
+  return SQLITE_OK;
+}
+
+/*
+** Destructor for a bytecodevtab_cursor.
+*/
+static int fts5structCloseMethod(sqlite3_vtab_cursor *cur){
+  Fts5StructVcsr *pCsr = (Fts5StructVcsr*)cur;
+  fts5StructureRelease(pCsr->pStruct);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+
+/*
+** Advance a bytecodevtab_cursor to its next row of output.
+*/
+static int fts5structNextMethod(sqlite3_vtab_cursor *cur){
+  Fts5StructVcsr *pCsr = (Fts5StructVcsr*)cur;
+  Fts5Structure *p = pCsr->pStruct;
+
+  assert( pCsr->pStruct );
+  pCsr->iSeg++;
+  pCsr->iRowid++;
+  while( pCsr->iLevel<p->nLevel && pCsr->iSeg>=p->aLevel[pCsr->iLevel].nSeg ){
+    pCsr->iLevel++;
+    pCsr->iSeg = 0;
+  }
+  if( pCsr->iLevel>=p->nLevel ){
+    fts5StructureRelease(pCsr->pStruct);
+    pCsr->pStruct = 0;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int fts5structEofMethod(sqlite3_vtab_cursor *cur){
+  Fts5StructVcsr *pCsr = (Fts5StructVcsr*)cur;
+  return pCsr->pStruct==0;
+}
+
+static int fts5structRowidMethod(
+  sqlite3_vtab_cursor *cur, 
+  sqlite_int64 *piRowid
+){
+  Fts5StructVcsr *pCsr = (Fts5StructVcsr*)cur;
+  *piRowid = pCsr->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the bytecodevtab_cursor
+** is currently pointing.
+*/
+static int fts5structColumnMethod(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  Fts5StructVcsr *pCsr = (Fts5StructVcsr*)cur;
+  Fts5Structure *p = pCsr->pStruct;
+  Fts5StructureSegment *pSeg = &p->aLevel[pCsr->iLevel].aSeg[pCsr->iSeg];
+
+  switch( i ){
+    case 0: /* level */
+      sqlite3_result_int(ctx, pCsr->iLevel);
+      break;
+    case 1: /* segment */
+      sqlite3_result_int(ctx, pCsr->iSeg);
+      break;
+    case 2: /* merge */
+      sqlite3_result_int(ctx, pCsr->iSeg < p->aLevel[pCsr->iLevel].nMerge);
+      break;
+    case 3: /* segid */
+      sqlite3_result_int(ctx, pSeg->iSegid);
+      break;
+    case 4: /* leaf1 */
+      sqlite3_result_int(ctx, pSeg->pgnoFirst);
+      break;
+    case 5: /* leaf2 */
+      sqlite3_result_int(ctx, pSeg->pgnoLast);
+      break;
+    case 6: /* origin1 */
+      sqlite3_result_int64(ctx, pSeg->iOrigin1);
+      break;
+    case 7: /* origin2 */
+      sqlite3_result_int64(ctx, pSeg->iOrigin2);
+      break;
+    case 8: /* npgtombstone */
+      sqlite3_result_int(ctx, pSeg->nPgTombstone);
+      break;
+    case 9: /* nentrytombstone */
+      sqlite3_result_int64(ctx, pSeg->nEntryTombstone);
+      break;
+    case 10: /* nentry */
+      sqlite3_result_int64(ctx, pSeg->nEntry);
+      break;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Initialize a cursor.
+**
+**    idxNum==0     means show all subprograms
+**    idxNum==1     means show only the main bytecode and omit subprograms.
+*/
+static int fts5structFilterMethod(
+  sqlite3_vtab_cursor *pVtabCursor, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  Fts5StructVcsr *pCsr = (Fts5StructVcsr *)pVtabCursor;
+  int rc = SQLITE_OK;
+
+  const u8 *aBlob = 0;
+  int nBlob = 0;
+
+  assert( argc==1 );
+  fts5StructureRelease(pCsr->pStruct);
+  pCsr->pStruct = 0;
+
+  nBlob = sqlite3_value_bytes(argv[0]);
+  aBlob = (const u8*)sqlite3_value_blob(argv[0]);
+  rc = fts5StructureDecode(aBlob, nBlob, 0, &pCsr->pStruct);
+  if( rc==SQLITE_OK ){
+    pCsr->iLevel = 0;
+    pCsr->iRowid = 0;
+    pCsr->iSeg = -1;
+    rc = fts5structNextMethod(pVtabCursor);
+  }
+
+  return rc;
+}
+
+#endif /* SQLITE_TEST || SQLITE_FTS5_DEBUG */
+
+/*
+** This is called as part of registering the FTS5 module with database
+** connection db. It registers several user-defined scalar functions useful
+** with FTS5.
+**
+** If successful, SQLITE_OK is returned. If an error occurs, some other
+** SQLite error code is returned instead.
+*/
+static int sqlite3Fts5IndexInit(sqlite3 *db){
+#if defined(SQLITE_TEST) || defined(SQLITE_FTS5_DEBUG)
+  int rc = sqlite3_create_function(
+      db, "fts5_decode", 2, SQLITE_UTF8, 0, fts5DecodeFunction, 0, 0
+  );
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(
+        db, "fts5_decode_none", 2, 
+        SQLITE_UTF8, (void*)db, fts5DecodeFunction, 0, 0
+    );
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(
+        db, "fts5_rowid", -1, SQLITE_UTF8, 0, fts5RowidFunction, 0, 0
+    );
+  }
+
+  if( rc==SQLITE_OK ){
+    static const sqlite3_module fts5structure_module = {
+      0,                           /* iVersion      */
+      0,                           /* xCreate       */
+      fts5structConnectMethod,     /* xConnect      */
+      fts5structBestIndexMethod,   /* xBestIndex    */
+      fts5structDisconnectMethod,  /* xDisconnect   */
+      0,                           /* xDestroy      */
+      fts5structOpenMethod,        /* xOpen         */
+      fts5structCloseMethod,       /* xClose        */
+      fts5structFilterMethod,      /* xFilter       */
+      fts5structNextMethod,        /* xNext         */
+      fts5structEofMethod,         /* xEof          */
+      fts5structColumnMethod,      /* xColumn       */
+      fts5structRowidMethod,       /* xRowid        */
+      0,                           /* xUpdate       */
+      0,                           /* xBegin        */
+      0,                           /* xSync         */
+      0,                           /* xCommit       */
+      0,                           /* xRollback     */
+      0,                           /* xFindFunction */
+      0,                           /* xRename       */
+      0,                           /* xSavepoint    */
+      0,                           /* xRelease      */
+      0,                           /* xRollbackTo   */
+      0,                           /* xShadowName   */
+      0                            /* xIntegrity    */
+    };
+    rc = sqlite3_create_module(db, "fts5_structure", &fts5structure_module, 0);
+  }
+  return rc;
+#else
+  return SQLITE_OK;
+  UNUSED_PARAM(db);
+#endif
+}
+
+
+static int sqlite3Fts5IndexReset(Fts5Index *p){
+  assert( p->pStruct==0 || p->iStructVersion!=0 );
+  if( fts5IndexDataVersion(p)!=p->iStructVersion ){
+    fts5StructureInvalidate(p);
+  }
+  return fts5IndexReturn(p);
+}
+
+#line 1 "fts5_main.c"
+/*
+** 2014 Jun 09
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This is an SQLite module implementing full-text search.
+*/
+
+
+/* #include "fts5Int.h" */
+
+/*
+** This variable is set to false when running tests for which the on disk
+** structures should not be corrupt. Otherwise, true. If it is false, extra
+** assert() conditions in the fts5 code are activated - conditions that are
+** only true if it is guaranteed that the fts5 database is not corrupt.
+*/
+#ifdef SQLITE_DEBUG
+int sqlite3_fts5_may_be_corrupt = 1;
+#endif
+
+
+typedef struct Fts5Auxdata Fts5Auxdata;
+typedef struct Fts5Auxiliary Fts5Auxiliary;
+typedef struct Fts5Cursor Fts5Cursor;
+typedef struct Fts5FullTable Fts5FullTable;
+typedef struct Fts5Sorter Fts5Sorter;
+typedef struct Fts5TokenizerModule Fts5TokenizerModule;
+
+/*
+** NOTES ON TRANSACTIONS: 
+**
+** SQLite invokes the following virtual table methods as transactions are 
+** opened and closed by the user:
+**
+**     xBegin():    Start of a new transaction.
+**     xSync():     Initial part of two-phase commit.
+**     xCommit():   Final part of two-phase commit.
+**     xRollback(): Rollback the transaction.
+**
+** Anything that is required as part of a commit that may fail is performed
+** in the xSync() callback. Current versions of SQLite ignore any errors 
+** returned by xCommit().
+**
+** And as sub-transactions are opened/closed:
+**
+**     xSavepoint(int S):  Open savepoint S.
+**     xRelease(int S):    Commit and close savepoint S.
+**     xRollbackTo(int S): Rollback to start of savepoint S.
+**
+** During a write-transaction the fts5_index.c module may cache some data 
+** in-memory. It is flushed to disk whenever xSync(), xRelease() or
+** xSavepoint() is called. And discarded whenever xRollback() or xRollbackTo() 
+** is called.
+**
+** Additionally, if SQLITE_DEBUG is defined, an instance of the following
+** structure is used to record the current transaction state. This information
+** is not required, but it is used in the assert() statements executed by
+** function fts5CheckTransactionState() (see below).
+*/
+struct Fts5TransactionState {
+  int eState;                     /* 0==closed, 1==open, 2==synced */
+  int iSavepoint;                 /* Number of open savepoints (0 -> none) */
+};
+
+/*
+** A single object of this type is allocated when the FTS5 module is 
+** registered with a database handle. It is used to store pointers to
+** all registered FTS5 extensions - tokenizers and auxiliary functions.
+*/
+struct Fts5Global {
+  fts5_api api;                   /* User visible part of object (see fts5.h) */
+  sqlite3 *db;                    /* Associated database connection */ 
+  i64 iNextId;                    /* Used to allocate unique cursor ids */
+  Fts5Auxiliary *pAux;            /* First in list of all aux. functions */
+  Fts5TokenizerModule *pTok;      /* First in list of all tokenizer modules */
+  Fts5TokenizerModule *pDfltTok;  /* Default tokenizer module */
+  Fts5Cursor *pCsr;               /* First in list of all open cursors */
+};
+
+/*
+** Each auxiliary function registered with the FTS5 module is represented
+** by an object of the following type. All such objects are stored as part
+** of the Fts5Global.pAux list.
+*/
+struct Fts5Auxiliary {
+  Fts5Global *pGlobal;            /* Global context for this function */
+  char *zFunc;                    /* Function name (nul-terminated) */
+  void *pUserData;                /* User-data pointer */
+  fts5_extension_function xFunc;  /* Callback function */
+  void (*xDestroy)(void*);        /* Destructor function */
+  Fts5Auxiliary *pNext;           /* Next registered auxiliary function */
+};
+
+/*
+** Each tokenizer module registered with the FTS5 module is represented
+** by an object of the following type. All such objects are stored as part
+** of the Fts5Global.pTok list.
+*/
+struct Fts5TokenizerModule {
+  char *zName;                    /* Name of tokenizer */
+  void *pUserData;                /* User pointer passed to xCreate() */
+  fts5_tokenizer x;               /* Tokenizer functions */
+  void (*xDestroy)(void*);        /* Destructor function */
+  Fts5TokenizerModule *pNext;     /* Next registered tokenizer module */
+};
+
+struct Fts5FullTable {
+  Fts5Table p;                    /* Public class members from fts5Int.h */
+  Fts5Storage *pStorage;          /* Document store */
+  Fts5Global *pGlobal;            /* Global (connection wide) data */
+  Fts5Cursor *pSortCsr;           /* Sort data from this cursor */
+  int iSavepoint;                 /* Successful xSavepoint()+1 */
+  
+#ifdef SQLITE_DEBUG
+  struct Fts5TransactionState ts;
+#endif
+};
+
+struct Fts5MatchPhrase {
+  Fts5Buffer *pPoslist;           /* Pointer to current poslist */
+  int nTerm;                      /* Size of phrase in terms */
+};
+
+/*
+** pStmt:
+**   SELECT rowid, <fts> FROM <fts> ORDER BY +rank;
+**
+** aIdx[]:
+**   There is one entry in the aIdx[] array for each phrase in the query,
+**   the value of which is the offset within aPoslist[] following the last 
+**   byte of the position list for the corresponding phrase.
+*/
+struct Fts5Sorter {
+  sqlite3_stmt *pStmt;
+  i64 iRowid;                     /* Current rowid */
+  const u8 *aPoslist;             /* Position lists for current row */
+  int nIdx;                       /* Number of entries in aIdx[] */
+  int aIdx[1];                    /* Offsets into aPoslist for current row */
+};
+
+
+/*
+** Virtual-table cursor object.
+**
+** iSpecial:
+**   If this is a 'special' query (refer to function fts5SpecialMatch()), 
+**   then this variable contains the result of the query. 
+**
+** iFirstRowid, iLastRowid:
+**   These variables are only used for FTS5_PLAN_MATCH cursors. Assuming the
+**   cursor iterates in ascending order of rowids, iFirstRowid is the lower
+**   limit of rowids to return, and iLastRowid the upper. In other words, the
+**   WHERE clause in the user's query might have been:
+**
+**       <tbl> MATCH <expr> AND rowid BETWEEN $iFirstRowid AND $iLastRowid
+**
+**   If the cursor iterates in descending order of rowid, iFirstRowid
+**   is the upper limit (i.e. the "first" rowid visited) and iLastRowid
+**   the lower.
+*/
+struct Fts5Cursor {
+  sqlite3_vtab_cursor base;       /* Base class used by SQLite core */
+  Fts5Cursor *pNext;              /* Next cursor in Fts5Cursor.pCsr list */
+  int *aColumnSize;               /* Values for xColumnSize() */
+  i64 iCsrId;                     /* Cursor id */
+
+  /* Zero from this point onwards on cursor reset */
+  int ePlan;                      /* FTS5_PLAN_XXX value */
+  int bDesc;                      /* True for "ORDER BY rowid DESC" queries */
+  i64 iFirstRowid;                /* Return no rowids earlier than this */
+  i64 iLastRowid;                 /* Return no rowids later than this */
+  sqlite3_stmt *pStmt;            /* Statement used to read %_content */
+  Fts5Expr *pExpr;                /* Expression for MATCH queries */
+  Fts5Sorter *pSorter;            /* Sorter for "ORDER BY rank" queries */
+  int csrflags;                   /* Mask of cursor flags (see below) */
+  i64 iSpecial;                   /* Result of special query */
+
+  /* "rank" function. Populated on demand from vtab.xColumn(). */
+  char *zRank;                    /* Custom rank function */
+  char *zRankArgs;                /* Custom rank function args */
+  Fts5Auxiliary *pRank;           /* Rank callback (or NULL) */
+  int nRankArg;                   /* Number of trailing arguments for rank() */
+  sqlite3_value **apRankArg;      /* Array of trailing arguments */
+  sqlite3_stmt *pRankArgStmt;     /* Origin of objects in apRankArg[] */
+
+  /* Auxiliary data storage */
+  Fts5Auxiliary *pAux;            /* Currently executing extension function */
+  Fts5Auxdata *pAuxdata;          /* First in linked list of saved aux-data */
+
+  /* Cache used by auxiliary functions xInst() and xInstCount() */
+  Fts5PoslistReader *aInstIter;   /* One for each phrase */
+  int nInstAlloc;                 /* Size of aInst[] array (entries / 3) */
+  int nInstCount;                 /* Number of phrase instances */
+  int *aInst;                     /* 3 integers per phrase instance */
+};
+
+/*
+** Bits that make up the "idxNum" parameter passed indirectly by 
+** xBestIndex() to xFilter().
+*/
+#define FTS5_BI_MATCH        0x0001         /* <tbl> MATCH ? */
+#define FTS5_BI_RANK         0x0002         /* rank MATCH ? */
+#define FTS5_BI_ROWID_EQ     0x0004         /* rowid == ? */
+#define FTS5_BI_ROWID_LE     0x0008         /* rowid <= ? */
+#define FTS5_BI_ROWID_GE     0x0010         /* rowid >= ? */
+
+#define FTS5_BI_ORDER_RANK   0x0020
+#define FTS5_BI_ORDER_ROWID  0x0040
+#define FTS5_BI_ORDER_DESC   0x0080
+
+/*
+** Values for Fts5Cursor.csrflags
+*/
+#define FTS5CSR_EOF               0x01
+#define FTS5CSR_REQUIRE_CONTENT   0x02
+#define FTS5CSR_REQUIRE_DOCSIZE   0x04
+#define FTS5CSR_REQUIRE_INST      0x08
+#define FTS5CSR_FREE_ZRANK        0x10
+#define FTS5CSR_REQUIRE_RESEEK    0x20
+#define FTS5CSR_REQUIRE_POSLIST   0x40
+
+#define BitFlagAllTest(x,y) (((x) & (y))==(y))
+#define BitFlagTest(x,y)    (((x) & (y))!=0)
+
+
+/*
+** Macros to Set(), Clear() and Test() cursor flags.
+*/
+#define CsrFlagSet(pCsr, flag)   ((pCsr)->csrflags |= (flag))
+#define CsrFlagClear(pCsr, flag) ((pCsr)->csrflags &= ~(flag))
+#define CsrFlagTest(pCsr, flag)  ((pCsr)->csrflags & (flag))
+
+struct Fts5Auxdata {
+  Fts5Auxiliary *pAux;            /* Extension to which this belongs */
+  void *pPtr;                     /* Pointer value */
+  void(*xDelete)(void*);          /* Destructor */
+  Fts5Auxdata *pNext;             /* Next object in linked list */
+};
+
+#ifdef SQLITE_DEBUG
+#define FTS5_BEGIN      1
+#define FTS5_SYNC       2
+#define FTS5_COMMIT     3
+#define FTS5_ROLLBACK   4
+#define FTS5_SAVEPOINT  5
+#define FTS5_RELEASE    6
+#define FTS5_ROLLBACKTO 7
+static void fts5CheckTransactionState(Fts5FullTable *p, int op, int iSavepoint){
+  switch( op ){
+    case FTS5_BEGIN:
+      assert( p->ts.eState==0 );
+      p->ts.eState = 1;
+      p->ts.iSavepoint = -1;
+      break;
+
+    case FTS5_SYNC:
+      assert( p->ts.eState==1 || p->ts.eState==2 );
+      p->ts.eState = 2;
+      break;
+
+    case FTS5_COMMIT:
+      assert( p->ts.eState==2 );
+      p->ts.eState = 0;
+      break;
+
+    case FTS5_ROLLBACK:
+      assert( p->ts.eState==1 || p->ts.eState==2 || p->ts.eState==0 );
+      p->ts.eState = 0;
+      break;
+
+    case FTS5_SAVEPOINT:
+      assert( p->ts.eState>=1 );
+      assert( iSavepoint>=0 );
+      assert( iSavepoint>=p->ts.iSavepoint );
+      p->ts.iSavepoint = iSavepoint;
+      break;
+      
+    case FTS5_RELEASE:
+      assert( p->ts.eState>=1 );
+      assert( iSavepoint>=0 );
+      assert( iSavepoint<=p->ts.iSavepoint );
+      p->ts.iSavepoint = iSavepoint-1;
+      break;
+
+    case FTS5_ROLLBACKTO:
+      assert( p->ts.eState>=1 );
+      assert( iSavepoint>=-1 );
+      /* The following assert() can fail if another vtab strikes an error
+      ** within an xSavepoint() call then SQLite calls xRollbackTo() - without
+      ** having called xSavepoint() on this vtab.  */
+      /* assert( iSavepoint<=p->ts.iSavepoint ); */
+      p->ts.iSavepoint = iSavepoint;
+      break;
+  }
+}
+#else
+# define fts5CheckTransactionState(x,y,z)
+#endif
+
+/*
+** Return true if pTab is a contentless table.
+*/
+static int fts5IsContentless(Fts5FullTable *pTab){
+  return pTab->p.pConfig->eContent==FTS5_CONTENT_NONE;
+}
+
+/*
+** Delete a virtual table handle allocated by fts5InitVtab(). 
+*/
+static void fts5FreeVtab(Fts5FullTable *pTab){
+  if( pTab ){
+    sqlite3Fts5IndexClose(pTab->p.pIndex);
+    sqlite3Fts5StorageClose(pTab->pStorage);
+    sqlite3Fts5ConfigFree(pTab->p.pConfig);
+    sqlite3_free(pTab);
+  }
+}
+
+/*
+** The xDisconnect() virtual table method.
+*/
+static int fts5DisconnectMethod(sqlite3_vtab *pVtab){
+  fts5FreeVtab((Fts5FullTable*)pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** The xDestroy() virtual table method.
+*/
+static int fts5DestroyMethod(sqlite3_vtab *pVtab){
+  Fts5Table *pTab = (Fts5Table*)pVtab;
+  int rc = sqlite3Fts5DropAll(pTab->pConfig);
+  if( rc==SQLITE_OK ){
+    fts5FreeVtab((Fts5FullTable*)pVtab);
+  }
+  return rc;
+}
+
+/*
+** This function is the implementation of both the xConnect and xCreate
+** methods of the FTS3 virtual table.
+**
+** The argv[] array contains the following:
+**
+**   argv[0]   -> module name  ("fts5")
+**   argv[1]   -> database name
+**   argv[2]   -> table name
+**   argv[...] -> "column name" and other module argument fields.
+*/
+static int fts5InitVtab(
+  int bCreate,                    /* True for xCreate, false for xConnect */
+  sqlite3 *db,                    /* The SQLite database connection */
+  void *pAux,                     /* Hash table containing tokenizers */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVTab,          /* Write the resulting vtab structure here */
+  char **pzErr                    /* Write any error message here */
+){
+  Fts5Global *pGlobal = (Fts5Global*)pAux;
+  const char **azConfig = (const char**)argv;
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Config *pConfig = 0;        /* Results of parsing argc/argv */
+  Fts5FullTable *pTab = 0;        /* New virtual table object */
+
+  /* Allocate the new vtab object and parse the configuration */
+  pTab = (Fts5FullTable*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5FullTable));
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5ConfigParse(pGlobal, db, argc, azConfig, &pConfig, pzErr);
+    assert( (rc==SQLITE_OK && *pzErr==0) || pConfig==0 );
+  }
+  if( rc==SQLITE_OK ){
+    pTab->p.pConfig = pConfig;
+    pTab->pGlobal = pGlobal;
+  }
+
+  /* Open the index sub-system */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexOpen(pConfig, bCreate, &pTab->p.pIndex, pzErr);
+  }
+
+  /* Open the storage sub-system */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageOpen(
+        pConfig, pTab->p.pIndex, bCreate, &pTab->pStorage, pzErr
+    );
+  }
+
+  /* Call sqlite3_declare_vtab() */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5ConfigDeclareVtab(pConfig);
+  }
+
+  /* Load the initial configuration */
+  if( rc==SQLITE_OK ){
+    assert( pConfig->pzErrmsg==0 );
+    pConfig->pzErrmsg = pzErr;
+    rc = sqlite3Fts5IndexLoadConfig(pTab->p.pIndex);
+    sqlite3Fts5IndexRollback(pTab->p.pIndex);
+    pConfig->pzErrmsg = 0;
+  }
+
+  if( rc==SQLITE_OK && pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    rc = sqlite3_vtab_config(db, SQLITE_VTAB_CONSTRAINT_SUPPORT, (int)1);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_vtab_config(db, SQLITE_VTAB_INNOCUOUS);
+  }
+
+  if( rc!=SQLITE_OK ){
+    fts5FreeVtab(pTab);
+    pTab = 0;
+  }else if( bCreate ){
+    fts5CheckTransactionState(pTab, FTS5_BEGIN, 0);
+  }
+  *ppVTab = (sqlite3_vtab*)pTab;
+  return rc;
+}
+
+/*
+** The xConnect() and xCreate() methods for the virtual table. All the
+** work is done in function fts5InitVtab().
+*/
+static int fts5ConnectMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5InitVtab(0, db, pAux, argc, argv, ppVtab, pzErr);
+}
+static int fts5CreateMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5InitVtab(1, db, pAux, argc, argv, ppVtab, pzErr);
+}
+
+/*
+** The different query plans.
+*/
+#define FTS5_PLAN_MATCH          1       /* (<tbl> MATCH ?) */
+#define FTS5_PLAN_SOURCE         2       /* A source cursor for SORTED_MATCH */
+#define FTS5_PLAN_SPECIAL        3       /* An internal query */
+#define FTS5_PLAN_SORTED_MATCH   4       /* (<tbl> MATCH ? ORDER BY rank) */
+#define FTS5_PLAN_SCAN           5       /* No usable constraint */
+#define FTS5_PLAN_ROWID          6       /* (rowid = ?) */
+
+/*
+** Set the SQLITE_INDEX_SCAN_UNIQUE flag in pIdxInfo->flags. Unless this
+** extension is currently being used by a version of SQLite too old to
+** support index-info flags. In that case this function is a no-op.
+*/
+static void fts5SetUniqueFlag(sqlite3_index_info *pIdxInfo){
+#if SQLITE_VERSION_NUMBER>=3008012
+#ifndef SQLITE_CORE
+  if( sqlite3_libversion_number()>=3008012 )
+#endif
+  {
+    pIdxInfo->idxFlags |= SQLITE_INDEX_SCAN_UNIQUE;
+  }
+#endif
+}
+
+static int fts5UsePatternMatch(
+  Fts5Config *pConfig, 
+  struct sqlite3_index_constraint *p
+){
+  assert( FTS5_PATTERN_GLOB==SQLITE_INDEX_CONSTRAINT_GLOB );
+  assert( FTS5_PATTERN_LIKE==SQLITE_INDEX_CONSTRAINT_LIKE );
+  if( pConfig->ePattern==FTS5_PATTERN_GLOB && p->op==FTS5_PATTERN_GLOB ){
+    return 1;
+  }
+  if( pConfig->ePattern==FTS5_PATTERN_LIKE 
+   && (p->op==FTS5_PATTERN_LIKE || p->op==FTS5_PATTERN_GLOB)
+  ){
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** Implementation of the xBestIndex method for FTS5 tables. Within the 
+** WHERE constraint, it searches for the following:
+**
+**   1. A MATCH constraint against the table column.
+**   2. A MATCH constraint against the "rank" column.
+**   3. A MATCH constraint against some other column.
+**   4. An == constraint against the rowid column.
+**   5. A < or <= constraint against the rowid column.
+**   6. A > or >= constraint against the rowid column.
+**
+** Within the ORDER BY, the following are supported:
+**
+**   5. ORDER BY rank [ASC|DESC]
+**   6. ORDER BY rowid [ASC|DESC]
+**
+** Information for the xFilter call is passed via both the idxNum and 
+** idxStr variables. Specifically, idxNum is a bitmask of the following
+** flags used to encode the ORDER BY clause:
+**
+**     FTS5_BI_ORDER_RANK
+**     FTS5_BI_ORDER_ROWID
+**     FTS5_BI_ORDER_DESC
+**
+** idxStr is used to encode data from the WHERE clause. For each argument
+** passed to the xFilter method, the following is appended to idxStr:
+**
+**   Match against table column:            "m"
+**   Match against rank column:             "r"
+**   Match against other column:            "M<column-number>"
+**   LIKE  against other column:            "L<column-number>"
+**   GLOB  against other column:            "G<column-number>"
+**   Equality constraint against the rowid: "="
+**   A < or <= against the rowid:           "<"
+**   A > or >= against the rowid:           ">"
+**
+** This function ensures that there is at most one "r" or "=". And that if
+** there exists an "=" then there is no "<" or ">".
+**
+** Costs are assigned as follows:
+**
+**  a) If an unusable MATCH operator is present in the WHERE clause, the
+**     cost is unconditionally set to 1e50 (a really big number).
+**
+**  a) If a MATCH operator is present, the cost depends on the other
+**     constraints also present. As follows:
+**
+**       * No other constraints:         cost=1000.0
+**       * One rowid range constraint:   cost=750.0
+**       * Both rowid range constraints: cost=500.0
+**       * An == rowid constraint:       cost=100.0
+**
+**  b) Otherwise, if there is no MATCH:
+**
+**       * No other constraints:         cost=1000000.0
+**       * One rowid range constraint:   cost=750000.0
+**       * Both rowid range constraints: cost=250000.0
+**       * An == rowid constraint:       cost=10.0
+**
+** Costs are not modified by the ORDER BY clause.
+*/
+static int fts5BestIndexMethod(sqlite3_vtab *pVTab, sqlite3_index_info *pInfo){
+  Fts5Table *pTab = (Fts5Table*)pVTab;
+  Fts5Config *pConfig = pTab->pConfig;
+  const int nCol = pConfig->nCol;
+  int idxFlags = 0;               /* Parameter passed through to xFilter() */
+  int i;
+
+  char *idxStr;
+  int iIdxStr = 0;
+  int iCons = 0;
+
+  int bSeenEq = 0;
+  int bSeenGt = 0;
+  int bSeenLt = 0;
+  int bSeenMatch = 0;
+  int bSeenRank = 0;
+
+
+  assert( SQLITE_INDEX_CONSTRAINT_EQ<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_GT<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_LE<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_GE<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_LE<SQLITE_INDEX_CONSTRAINT_MATCH );
+
+  if( pConfig->bLock ){
+    pTab->base.zErrMsg = sqlite3_mprintf(
+        "recursively defined fts5 content table"
+    );
+    return SQLITE_ERROR;
+  }
+
+  idxStr = (char*)sqlite3_malloc(pInfo->nConstraint * 8 + 1);
+  if( idxStr==0 ) return SQLITE_NOMEM;
+  pInfo->idxStr = idxStr;
+  pInfo->needToFreeIdxStr = 1;
+
+  for(i=0; i<pInfo->nConstraint; i++){
+    struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
+    int iCol = p->iColumn;
+    if( p->op==SQLITE_INDEX_CONSTRAINT_MATCH
+     || (p->op==SQLITE_INDEX_CONSTRAINT_EQ && iCol>=nCol)
+    ){
+      /* A MATCH operator or equivalent */
+      if( p->usable==0 || iCol<0 ){
+        /* As there exists an unusable MATCH constraint this is an 
+        ** unusable plan. Set a prohibitively high cost. */
+        pInfo->estimatedCost = 1e50;
+        assert( iIdxStr < pInfo->nConstraint*6 + 1 );
+        idxStr[iIdxStr] = 0;
+        return SQLITE_OK;
+      }else{
+        if( iCol==nCol+1 ){
+          if( bSeenRank ) continue;
+          idxStr[iIdxStr++] = 'r';
+          bSeenRank = 1;
+        }else if( iCol>=0 ){
+          bSeenMatch = 1;
+          idxStr[iIdxStr++] = 'M';
+          sqlite3_snprintf(6, &idxStr[iIdxStr], "%d", iCol);
+          idxStr += strlen(&idxStr[iIdxStr]);
+          assert( idxStr[iIdxStr]=='\0' );
+        }
+        pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+        pInfo->aConstraintUsage[i].omit = 1;
+      }
+    }else if( p->usable ){
+      if( iCol>=0 && iCol<nCol && fts5UsePatternMatch(pConfig, p) ){
+        assert( p->op==FTS5_PATTERN_LIKE || p->op==FTS5_PATTERN_GLOB );
+        idxStr[iIdxStr++] = p->op==FTS5_PATTERN_LIKE ? 'L' : 'G';
+        sqlite3_snprintf(6, &idxStr[iIdxStr], "%d", iCol);
+        idxStr += strlen(&idxStr[iIdxStr]);
+        pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+        assert( idxStr[iIdxStr]=='\0' );
+      }else if( bSeenEq==0 && p->op==SQLITE_INDEX_CONSTRAINT_EQ && iCol<0 ){
+        idxStr[iIdxStr++] = '=';
+        bSeenEq = 1;
+        pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+      }
+    }
+  }
+
+  if( bSeenEq==0 ){
+    for(i=0; i<pInfo->nConstraint; i++){
+      struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
+      if( p->iColumn<0 && p->usable ){
+        int op = p->op;
+        if( op==SQLITE_INDEX_CONSTRAINT_LT || op==SQLITE_INDEX_CONSTRAINT_LE ){
+          if( bSeenLt ) continue;
+          idxStr[iIdxStr++] = '<';
+          pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+          bSeenLt = 1;
+        }else
+        if( op==SQLITE_INDEX_CONSTRAINT_GT || op==SQLITE_INDEX_CONSTRAINT_GE ){
+          if( bSeenGt ) continue;
+          idxStr[iIdxStr++] = '>';
+          pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+          bSeenGt = 1;
+        }
+      }
+    }
+  }
+  idxStr[iIdxStr] = '\0';
+
+  /* Set idxFlags flags for the ORDER BY clause
+  **
+  ** Note that tokendata=1 tables cannot currently handle "ORDER BY rowid DESC".
+  */
+  if( pInfo->nOrderBy==1 ){
+    int iSort = pInfo->aOrderBy[0].iColumn;
+    if( iSort==(pConfig->nCol+1) && bSeenMatch ){
+      idxFlags |= FTS5_BI_ORDER_RANK;
+    }else if( iSort==-1 && (!pInfo->aOrderBy[0].desc || !pConfig->bTokendata) ){
+      idxFlags |= FTS5_BI_ORDER_ROWID;
+    }
+    if( BitFlagTest(idxFlags, FTS5_BI_ORDER_RANK|FTS5_BI_ORDER_ROWID) ){
+      pInfo->orderByConsumed = 1;
+      if( pInfo->aOrderBy[0].desc ){
+        idxFlags |= FTS5_BI_ORDER_DESC;
+      }
+    }
+  }
+
+  /* Calculate the estimated cost based on the flags set in idxFlags. */
+  if( bSeenEq ){
+    pInfo->estimatedCost = bSeenMatch ? 100.0 : 10.0;
+    if( bSeenMatch==0 ) fts5SetUniqueFlag(pInfo);
+  }else if( bSeenLt && bSeenGt ){
+    pInfo->estimatedCost = bSeenMatch ? 500.0 : 250000.0;
+  }else if( bSeenLt || bSeenGt ){
+    pInfo->estimatedCost = bSeenMatch ? 750.0 : 750000.0;
+  }else{
+    pInfo->estimatedCost = bSeenMatch ? 1000.0 : 1000000.0;
+  }
+
+  pInfo->idxNum = idxFlags;
+  return SQLITE_OK;
+}
+
+static int fts5NewTransaction(Fts5FullTable *pTab){
+  Fts5Cursor *pCsr;
+  for(pCsr=pTab->pGlobal->pCsr; pCsr; pCsr=pCsr->pNext){
+    if( pCsr->base.pVtab==(sqlite3_vtab*)pTab ) return SQLITE_OK;
+  }
+  return sqlite3Fts5StorageReset(pTab->pStorage);
+}
+
+/*
+** Implementation of xOpen method.
+*/
+static int fts5OpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVTab;
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Cursor *pCsr = 0;           /* New cursor object */
+  sqlite3_int64 nByte;            /* Bytes of space to allocate */
+  int rc;                         /* Return code */
+
+  rc = fts5NewTransaction(pTab);
+  if( rc==SQLITE_OK ){
+    nByte = sizeof(Fts5Cursor) + pConfig->nCol * sizeof(int);
+    pCsr = (Fts5Cursor*)sqlite3_malloc64(nByte);
+    if( pCsr ){
+      Fts5Global *pGlobal = pTab->pGlobal;
+      memset(pCsr, 0, (size_t)nByte);
+      pCsr->aColumnSize = (int*)&pCsr[1];
+      pCsr->pNext = pGlobal->pCsr;
+      pGlobal->pCsr = pCsr;
+      pCsr->iCsrId = ++pGlobal->iNextId;
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+  *ppCsr = (sqlite3_vtab_cursor*)pCsr;
+  return rc;
+}
+
+static int fts5StmtType(Fts5Cursor *pCsr){
+  if( pCsr->ePlan==FTS5_PLAN_SCAN ){
+    return (pCsr->bDesc) ? FTS5_STMT_SCAN_DESC : FTS5_STMT_SCAN_ASC;
+  }
+  return FTS5_STMT_LOOKUP;
+}
+
+/*
+** This function is called after the cursor passed as the only argument
+** is moved to point at a different row. It clears all cached data 
+** specific to the previous row stored by the cursor object.
+*/
+static void fts5CsrNewrow(Fts5Cursor *pCsr){
+  CsrFlagSet(pCsr, 
+      FTS5CSR_REQUIRE_CONTENT 
+    | FTS5CSR_REQUIRE_DOCSIZE 
+    | FTS5CSR_REQUIRE_INST 
+    | FTS5CSR_REQUIRE_POSLIST 
+  );
+}
+
+static void fts5FreeCursorComponents(Fts5Cursor *pCsr){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  Fts5Auxdata *pData;
+  Fts5Auxdata *pNext;
+
+  sqlite3_free(pCsr->aInstIter);
+  sqlite3_free(pCsr->aInst);
+  if( pCsr->pStmt ){
+    int eStmt = fts5StmtType(pCsr);
+    sqlite3Fts5StorageStmtRelease(pTab->pStorage, eStmt, pCsr->pStmt);
+  }
+  if( pCsr->pSorter ){
+    Fts5Sorter *pSorter = pCsr->pSorter;
+    sqlite3_finalize(pSorter->pStmt);
+    sqlite3_free(pSorter);
+  }
+
+  if( pCsr->ePlan!=FTS5_PLAN_SOURCE ){
+    sqlite3Fts5ExprFree(pCsr->pExpr);
+  }
+
+  for(pData=pCsr->pAuxdata; pData; pData=pNext){
+    pNext = pData->pNext;
+    if( pData->xDelete ) pData->xDelete(pData->pPtr);
+    sqlite3_free(pData);
+  }
+
+  sqlite3_finalize(pCsr->pRankArgStmt);
+  sqlite3_free(pCsr->apRankArg);
+
+  if( CsrFlagTest(pCsr, FTS5CSR_FREE_ZRANK) ){
+    sqlite3_free(pCsr->zRank);
+    sqlite3_free(pCsr->zRankArgs);
+  }
+
+  sqlite3Fts5IndexCloseReader(pTab->p.pIndex);
+  memset(&pCsr->ePlan, 0, sizeof(Fts5Cursor) - ((u8*)&pCsr->ePlan - (u8*)pCsr));
+}
+
+
+/*
+** Close the cursor.  For additional information see the documentation
+** on the xClose method of the virtual table interface.
+*/
+static int fts5CloseMethod(sqlite3_vtab_cursor *pCursor){
+  if( pCursor ){
+    Fts5FullTable *pTab = (Fts5FullTable*)(pCursor->pVtab);
+    Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+    Fts5Cursor **pp;
+
+    fts5FreeCursorComponents(pCsr);
+    /* Remove the cursor from the Fts5Global.pCsr list */
+    for(pp=&pTab->pGlobal->pCsr; (*pp)!=pCsr; pp=&(*pp)->pNext);
+    *pp = pCsr->pNext;
+
+    sqlite3_free(pCsr);
+  }
+  return SQLITE_OK;
+}
+
+static int fts5SorterNext(Fts5Cursor *pCsr){
+  Fts5Sorter *pSorter = pCsr->pSorter;
+  int rc;
+
+  rc = sqlite3_step(pSorter->pStmt);
+  if( rc==SQLITE_DONE ){
+    rc = SQLITE_OK;
+    CsrFlagSet(pCsr, FTS5CSR_EOF|FTS5CSR_REQUIRE_CONTENT);
+  }else if( rc==SQLITE_ROW ){
+    const u8 *a;
+    const u8 *aBlob;
+    int nBlob;
+    int i;
+    int iOff = 0;
+    rc = SQLITE_OK;
+
+    pSorter->iRowid = sqlite3_column_int64(pSorter->pStmt, 0);
+    nBlob = sqlite3_column_bytes(pSorter->pStmt, 1);
+    aBlob = a = sqlite3_column_blob(pSorter->pStmt, 1);
+
+    /* nBlob==0 in detail=none mode. */
+    if( nBlob>0 ){
+      for(i=0; i<(pSorter->nIdx-1); i++){
+        int iVal;
+        a += fts5GetVarint32(a, iVal);
+        iOff += iVal;
+        pSorter->aIdx[i] = iOff;
+      }
+      pSorter->aIdx[i] = &aBlob[nBlob] - a;
+      pSorter->aPoslist = a;
+    }
+
+    fts5CsrNewrow(pCsr);
+  }
+
+  return rc;
+}
+
+
+/*
+** Set the FTS5CSR_REQUIRE_RESEEK flag on all FTS5_PLAN_MATCH cursors 
+** open on table pTab.
+*/
+static void fts5TripCursors(Fts5FullTable *pTab){
+  Fts5Cursor *pCsr;
+  for(pCsr=pTab->pGlobal->pCsr; pCsr; pCsr=pCsr->pNext){
+    if( pCsr->ePlan==FTS5_PLAN_MATCH
+     && pCsr->base.pVtab==(sqlite3_vtab*)pTab 
+    ){
+      CsrFlagSet(pCsr, FTS5CSR_REQUIRE_RESEEK);
+    }
+  }
+}
+
+/*
+** If the REQUIRE_RESEEK flag is set on the cursor passed as the first
+** argument, close and reopen all Fts5IndexIter iterators that the cursor 
+** is using. Then attempt to move the cursor to a rowid equal to or laster
+** (in the cursors sort order - ASC or DESC) than the current rowid. 
+**
+** If the new rowid is not equal to the old, set output parameter *pbSkip
+** to 1 before returning. Otherwise, leave it unchanged.
+**
+** Return SQLITE_OK if successful or if no reseek was required, or an 
+** error code if an error occurred.
+*/
+static int fts5CursorReseek(Fts5Cursor *pCsr, int *pbSkip){
+  int rc = SQLITE_OK;
+  assert( *pbSkip==0 );
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_RESEEK) ){
+    Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+    int bDesc = pCsr->bDesc;
+    i64 iRowid = sqlite3Fts5ExprRowid(pCsr->pExpr);
+
+    rc = sqlite3Fts5ExprFirst(pCsr->pExpr, pTab->p.pIndex, iRowid, bDesc);
+    if( rc==SQLITE_OK &&  iRowid!=sqlite3Fts5ExprRowid(pCsr->pExpr) ){
+      *pbSkip = 1;
+    }
+
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_RESEEK);
+    fts5CsrNewrow(pCsr);
+    if( sqlite3Fts5ExprEof(pCsr->pExpr) ){
+      CsrFlagSet(pCsr, FTS5CSR_EOF);
+      *pbSkip = 1;
+    }
+  }
+  return rc;
+}
+
+
+/*
+** Advance the cursor to the next row in the table that matches the 
+** search criteria.
+**
+** Return SQLITE_OK if nothing goes wrong.  SQLITE_OK is returned
+** even if we reach end-of-file.  The fts5EofMethod() will be called
+** subsequently to determine whether or not an EOF was hit.
+*/
+static int fts5NextMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int rc;
+
+  assert( (pCsr->ePlan<3)==
+          (pCsr->ePlan==FTS5_PLAN_MATCH || pCsr->ePlan==FTS5_PLAN_SOURCE) 
+  );
+  assert( !CsrFlagTest(pCsr, FTS5CSR_EOF) );
+
+  /* If this cursor uses FTS5_PLAN_MATCH and this is a tokendata=1 table,
+  ** clear any token mappings accumulated at the fts5_index.c level. In
+  ** other cases, specifically FTS5_PLAN_SOURCE and FTS5_PLAN_SORTED_MATCH,
+  ** we need to retain the mappings for the entire query.  */
+  if( pCsr->ePlan==FTS5_PLAN_MATCH 
+   && ((Fts5Table*)pCursor->pVtab)->pConfig->bTokendata 
+  ){
+    sqlite3Fts5ExprClearTokens(pCsr->pExpr);
+  }
+
+  if( pCsr->ePlan<3 ){
+    int bSkip = 0;
+    if( (rc = fts5CursorReseek(pCsr, &bSkip)) || bSkip ) return rc;
+    rc = sqlite3Fts5ExprNext(pCsr->pExpr, pCsr->iLastRowid);
+    CsrFlagSet(pCsr, sqlite3Fts5ExprEof(pCsr->pExpr));
+    fts5CsrNewrow(pCsr);
+  }else{
+    switch( pCsr->ePlan ){
+      case FTS5_PLAN_SPECIAL: {
+        CsrFlagSet(pCsr, FTS5CSR_EOF);
+        rc = SQLITE_OK;
+        break;
+      }
+  
+      case FTS5_PLAN_SORTED_MATCH: {
+        rc = fts5SorterNext(pCsr);
+        break;
+      }
+  
+      default: {
+        Fts5Config *pConfig = ((Fts5Table*)pCursor->pVtab)->pConfig;
+        pConfig->bLock++;
+        rc = sqlite3_step(pCsr->pStmt);
+        pConfig->bLock--;
+        if( rc!=SQLITE_ROW ){
+          CsrFlagSet(pCsr, FTS5CSR_EOF);
+          rc = sqlite3_reset(pCsr->pStmt);
+          if( rc!=SQLITE_OK ){
+            pCursor->pVtab->zErrMsg = sqlite3_mprintf(
+                "%s", sqlite3_errmsg(pConfig->db)
+            );
+          }
+        }else{
+          rc = SQLITE_OK;
+        }
+        break;
+      }
+    }
+  }
+  
+  return rc;
+}
+
+
+static int fts5PrepareStatement(
+  sqlite3_stmt **ppStmt,
+  Fts5Config *pConfig, 
+  const char *zFmt,
+  ...
+){
+  sqlite3_stmt *pRet = 0;
+  int rc;
+  char *zSql;
+  va_list ap;
+
+  va_start(ap, zFmt);
+  zSql = sqlite3_vmprintf(zFmt, ap);
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM; 
+  }else{
+    rc = sqlite3_prepare_v3(pConfig->db, zSql, -1, 
+                            SQLITE_PREPARE_PERSISTENT, &pRet, 0);
+    if( rc!=SQLITE_OK ){
+      *pConfig->pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(pConfig->db));
+    }
+    sqlite3_free(zSql);
+  }
+
+  va_end(ap);
+  *ppStmt = pRet;
+  return rc;
+} 
+
+static int fts5CursorFirstSorted(
+  Fts5FullTable *pTab, 
+  Fts5Cursor *pCsr, 
+  int bDesc
+){
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Sorter *pSorter;
+  int nPhrase;
+  sqlite3_int64 nByte;
+  int rc;
+  const char *zRank = pCsr->zRank;
+  const char *zRankArgs = pCsr->zRankArgs;
+  
+  nPhrase = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+  nByte = sizeof(Fts5Sorter) + sizeof(int) * (nPhrase-1);
+  pSorter = (Fts5Sorter*)sqlite3_malloc64(nByte);
+  if( pSorter==0 ) return SQLITE_NOMEM;
+  memset(pSorter, 0, (size_t)nByte);
+  pSorter->nIdx = nPhrase;
+
+  /* TODO: It would be better to have some system for reusing statement
+  ** handles here, rather than preparing a new one for each query. But that
+  ** is not possible as SQLite reference counts the virtual table objects.
+  ** And since the statement required here reads from this very virtual 
+  ** table, saving it creates a circular reference.
+  **
+  ** If SQLite a built-in statement cache, this wouldn't be a problem. */
+  rc = fts5PrepareStatement(&pSorter->pStmt, pConfig,
+      "SELECT rowid, rank FROM %Q.%Q ORDER BY %s(\"%w\"%s%s) %s",
+      pConfig->zDb, pConfig->zName, zRank, pConfig->zName,
+      (zRankArgs ? ", " : ""),
+      (zRankArgs ? zRankArgs : ""),
+      bDesc ? "DESC" : "ASC"
+  );
+
+  pCsr->pSorter = pSorter;
+  if( rc==SQLITE_OK ){
+    assert( pTab->pSortCsr==0 );
+    pTab->pSortCsr = pCsr;
+    rc = fts5SorterNext(pCsr);
+    pTab->pSortCsr = 0;
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_finalize(pSorter->pStmt);
+    sqlite3_free(pSorter);
+    pCsr->pSorter = 0;
+  }
+
+  return rc;
+}
+
+static int fts5CursorFirst(Fts5FullTable *pTab, Fts5Cursor *pCsr, int bDesc){
+  int rc;
+  Fts5Expr *pExpr = pCsr->pExpr;
+  rc = sqlite3Fts5ExprFirst(pExpr, pTab->p.pIndex, pCsr->iFirstRowid, bDesc);
+  if( sqlite3Fts5ExprEof(pExpr) ){
+    CsrFlagSet(pCsr, FTS5CSR_EOF);
+  }
+  fts5CsrNewrow(pCsr);
+  return rc;
+}
+
+/*
+** Process a "special" query. A special query is identified as one with a
+** MATCH expression that begins with a '*' character. The remainder of
+** the text passed to the MATCH operator are used as  the special query
+** parameters.
+*/
+static int fts5SpecialMatch(
+  Fts5FullTable *pTab, 
+  Fts5Cursor *pCsr, 
+  const char *zQuery
+){
+  int rc = SQLITE_OK;             /* Return code */
+  const char *z = zQuery;         /* Special query text */
+  int n;                          /* Number of bytes in text at z */
+
+  while( z[0]==' ' ) z++;
+  for(n=0; z[n] && z[n]!=' '; n++);
+
+  assert( pTab->p.base.zErrMsg==0 );
+  pCsr->ePlan = FTS5_PLAN_SPECIAL;
+
+  if( n==5 && 0==sqlite3_strnicmp("reads", z, n) ){
+    pCsr->iSpecial = sqlite3Fts5IndexReads(pTab->p.pIndex);
+  }
+  else if( n==2 && 0==sqlite3_strnicmp("id", z, n) ){
+    pCsr->iSpecial = pCsr->iCsrId;
+  }
+  else{
+    /* An unrecognized directive. Return an error message. */
+    pTab->p.base.zErrMsg = sqlite3_mprintf("unknown special query: %.*s", n, z);
+    rc = SQLITE_ERROR;
+  }
+
+  return rc;
+}
+
+/*
+** Search for an auxiliary function named zName that can be used with table
+** pTab. If one is found, return a pointer to the corresponding Fts5Auxiliary
+** structure. Otherwise, if no such function exists, return NULL.
+*/
+static Fts5Auxiliary *fts5FindAuxiliary(Fts5FullTable *pTab, const char *zName){
+  Fts5Auxiliary *pAux;
+
+  for(pAux=pTab->pGlobal->pAux; pAux; pAux=pAux->pNext){
+    if( sqlite3_stricmp(zName, pAux->zFunc)==0 ) return pAux;
+  }
+
+  /* No function of the specified name was found. Return 0. */
+  return 0;
+}
+
+
+static int fts5FindRankFunction(Fts5Cursor *pCsr){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int rc = SQLITE_OK;
+  Fts5Auxiliary *pAux = 0;
+  const char *zRank = pCsr->zRank;
+  const char *zRankArgs = pCsr->zRankArgs;
+
+  if( zRankArgs ){
+    char *zSql = sqlite3Fts5Mprintf(&rc, "SELECT %s", zRankArgs);
+    if( zSql ){
+      sqlite3_stmt *pStmt = 0;
+      rc = sqlite3_prepare_v3(pConfig->db, zSql, -1,
+                              SQLITE_PREPARE_PERSISTENT, &pStmt, 0);
+      sqlite3_free(zSql);
+      assert( rc==SQLITE_OK || pCsr->pRankArgStmt==0 );
+      if( rc==SQLITE_OK ){
+        if( SQLITE_ROW==sqlite3_step(pStmt) ){
+          sqlite3_int64 nByte;
+          pCsr->nRankArg = sqlite3_column_count(pStmt);
+          nByte = sizeof(sqlite3_value*)*pCsr->nRankArg;
+          pCsr->apRankArg = (sqlite3_value**)sqlite3Fts5MallocZero(&rc, nByte);
+          if( rc==SQLITE_OK ){
+            int i;
+            for(i=0; i<pCsr->nRankArg; i++){
+              pCsr->apRankArg[i] = sqlite3_column_value(pStmt, i);
+            }
+          }
+          pCsr->pRankArgStmt = pStmt;
+        }else{
+          rc = sqlite3_finalize(pStmt);
+          assert( rc!=SQLITE_OK );
+        }
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    pAux = fts5FindAuxiliary(pTab, zRank);
+    if( pAux==0 ){
+      assert( pTab->p.base.zErrMsg==0 );
+      pTab->p.base.zErrMsg = sqlite3_mprintf("no such function: %s", zRank);
+      rc = SQLITE_ERROR;
+    }
+  }
+
+  pCsr->pRank = pAux;
+  return rc;
+}
+
+
+static int fts5CursorParseRank(
+  Fts5Config *pConfig,
+  Fts5Cursor *pCsr, 
+  sqlite3_value *pRank
+){
+  int rc = SQLITE_OK;
+  if( pRank ){
+    const char *z = (const char*)sqlite3_value_text(pRank);
+    char *zRank = 0;
+    char *zRankArgs = 0;
+
+    if( z==0 ){
+      if( sqlite3_value_type(pRank)==SQLITE_NULL ) rc = SQLITE_ERROR;
+    }else{
+      rc = sqlite3Fts5ConfigParseRank(z, &zRank, &zRankArgs);
+    }
+    if( rc==SQLITE_OK ){
+      pCsr->zRank = zRank;
+      pCsr->zRankArgs = zRankArgs;
+      CsrFlagSet(pCsr, FTS5CSR_FREE_ZRANK);
+    }else if( rc==SQLITE_ERROR ){
+      pCsr->base.pVtab->zErrMsg = sqlite3_mprintf(
+          "parse error in rank function: %s", z
+      );
+    }
+  }else{
+    if( pConfig->zRank ){
+      pCsr->zRank = (char*)pConfig->zRank;
+      pCsr->zRankArgs = (char*)pConfig->zRankArgs;
+    }else{
+      pCsr->zRank = (char*)FTS5_DEFAULT_RANK;
+      pCsr->zRankArgs = 0;
+    }
+  }
+  return rc;
+}
+
+static i64 fts5GetRowidLimit(sqlite3_value *pVal, i64 iDefault){
+  if( pVal ){
+    int eType = sqlite3_value_numeric_type(pVal);
+    if( eType==SQLITE_INTEGER ){
+      return sqlite3_value_int64(pVal);
+    }
+  }
+  return iDefault;
+}
+
+/*
+** This is the xFilter interface for the virtual table.  See
+** the virtual table xFilter method documentation for additional
+** information.
+** 
+** There are three possible query strategies:
+**
+**   1. Full-text search using a MATCH operator.
+**   2. A by-rowid lookup.
+**   3. A full-table scan.
+*/
+static int fts5FilterMethod(
+  sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
+  int idxNum,                     /* Strategy index */
+  const char *idxStr,             /* Unused */
+  int nVal,                       /* Number of elements in apVal */
+  sqlite3_value **apVal           /* Arguments for the indexing scheme */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCursor->pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int rc = SQLITE_OK;             /* Error code */
+  int bDesc;                      /* True if ORDER BY [rank|rowid] DESC */
+  int bOrderByRank;               /* True if ORDER BY rank */
+  sqlite3_value *pRank = 0;       /* rank MATCH ? expression (or NULL) */
+  sqlite3_value *pRowidEq = 0;    /* rowid = ? expression (or NULL) */
+  sqlite3_value *pRowidLe = 0;    /* rowid <= ? expression (or NULL) */
+  sqlite3_value *pRowidGe = 0;    /* rowid >= ? expression (or NULL) */
+  int iCol;                       /* Column on LHS of MATCH operator */
+  char **pzErrmsg = pConfig->pzErrmsg;
+  int i;
+  int iIdxStr = 0;
+  Fts5Expr *pExpr = 0;
+
+  if( pConfig->bLock ){
+    pTab->p.base.zErrMsg = sqlite3_mprintf(
+        "recursively defined fts5 content table"
+    );
+    return SQLITE_ERROR;
+  }
+
+  if( pCsr->ePlan ){
+    fts5FreeCursorComponents(pCsr);
+    memset(&pCsr->ePlan, 0, sizeof(Fts5Cursor) - ((u8*)&pCsr->ePlan-(u8*)pCsr));
+  }
+
+  assert( pCsr->pStmt==0 );
+  assert( pCsr->pExpr==0 );
+  assert( pCsr->csrflags==0 );
+  assert( pCsr->pRank==0 );
+  assert( pCsr->zRank==0 );
+  assert( pCsr->zRankArgs==0 );
+  assert( pTab->pSortCsr==0 || nVal==0 );
+
+  assert( pzErrmsg==0 || pzErrmsg==&pTab->p.base.zErrMsg );
+  pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+
+  /* Decode the arguments passed through to this function. */
+  for(i=0; i<nVal; i++){
+    switch( idxStr[iIdxStr++] ){
+      case 'r':
+        pRank = apVal[i];
+        break;
+      case 'M': {
+        const char *zText = (const char*)sqlite3_value_text(apVal[i]);
+        if( zText==0 ) zText = "";
+        iCol = 0;
+        do{
+          iCol = iCol*10 + (idxStr[iIdxStr]-'0');
+          iIdxStr++;
+        }while( idxStr[iIdxStr]>='0' && idxStr[iIdxStr]<='9' );
+
+        if( zText[0]=='*' ){
+          /* The user has issued a query of the form "MATCH '*...'". This
+          ** indicates that the MATCH expression is not a full text query,
+          ** but a request for an internal parameter.  */
+          rc = fts5SpecialMatch(pTab, pCsr, &zText[1]);
+          goto filter_out;
+        }else{
+          char **pzErr = &pTab->p.base.zErrMsg;
+          rc = sqlite3Fts5ExprNew(pConfig, 0, iCol, zText, &pExpr, pzErr);
+          if( rc==SQLITE_OK ){
+            rc = sqlite3Fts5ExprAnd(&pCsr->pExpr, pExpr);
+            pExpr = 0;
+          }
+          if( rc!=SQLITE_OK ) goto filter_out;
+        }
+
+        break;
+      }
+      case 'L':
+      case 'G': {
+        int bGlob = (idxStr[iIdxStr-1]=='G');
+        const char *zText = (const char*)sqlite3_value_text(apVal[i]);
+        iCol = 0;
+        do{
+          iCol = iCol*10 + (idxStr[iIdxStr]-'0');
+          iIdxStr++;
+        }while( idxStr[iIdxStr]>='0' && idxStr[iIdxStr]<='9' );
+        if( zText ){
+          rc = sqlite3Fts5ExprPattern(pConfig, bGlob, iCol, zText, &pExpr);
+        }
+        if( rc==SQLITE_OK ){
+          rc = sqlite3Fts5ExprAnd(&pCsr->pExpr, pExpr);
+          pExpr = 0;
+        }
+        if( rc!=SQLITE_OK ) goto filter_out;
+        break;
+      }
+      case '=':
+        pRowidEq = apVal[i];
+        break;
+      case '<':
+        pRowidLe = apVal[i];
+        break;
+      default: assert( idxStr[iIdxStr-1]=='>' );
+        pRowidGe = apVal[i];
+        break;
+    }
+  }
+  bOrderByRank = ((idxNum & FTS5_BI_ORDER_RANK) ? 1 : 0);
+  pCsr->bDesc = bDesc = ((idxNum & FTS5_BI_ORDER_DESC) ? 1 : 0);
+
+  /* Set the cursor upper and lower rowid limits. Only some strategies 
+  ** actually use them. This is ok, as the xBestIndex() method leaves the
+  ** sqlite3_index_constraint.omit flag clear for range constraints
+  ** on the rowid field.  */
+  if( pRowidEq ){
+    pRowidLe = pRowidGe = pRowidEq;
+  }
+  if( bDesc ){
+    pCsr->iFirstRowid = fts5GetRowidLimit(pRowidLe, LARGEST_INT64);
+    pCsr->iLastRowid = fts5GetRowidLimit(pRowidGe, SMALLEST_INT64);
+  }else{
+    pCsr->iLastRowid = fts5GetRowidLimit(pRowidLe, LARGEST_INT64);
+    pCsr->iFirstRowid = fts5GetRowidLimit(pRowidGe, SMALLEST_INT64);
+  }
+
+  rc = sqlite3Fts5IndexLoadConfig(pTab->p.pIndex);
+  if( rc!=SQLITE_OK ) goto filter_out;
+
+  if( pTab->pSortCsr ){
+    /* If pSortCsr is non-NULL, then this call is being made as part of 
+    ** processing for a "... MATCH <expr> ORDER BY rank" query (ePlan is
+    ** set to FTS5_PLAN_SORTED_MATCH). pSortCsr is the cursor that will
+    ** return results to the user for this query. The current cursor 
+    ** (pCursor) is used to execute the query issued by function 
+    ** fts5CursorFirstSorted() above.  */
+    assert( pRowidEq==0 && pRowidLe==0 && pRowidGe==0 && pRank==0 );
+    assert( nVal==0 && bOrderByRank==0 && bDesc==0 );
+    assert( pCsr->iLastRowid==LARGEST_INT64 );
+    assert( pCsr->iFirstRowid==SMALLEST_INT64 );
+    if( pTab->pSortCsr->bDesc ){
+      pCsr->iLastRowid = pTab->pSortCsr->iFirstRowid;
+      pCsr->iFirstRowid = pTab->pSortCsr->iLastRowid;
+    }else{
+      pCsr->iLastRowid = pTab->pSortCsr->iLastRowid;
+      pCsr->iFirstRowid = pTab->pSortCsr->iFirstRowid;
+    }
+    pCsr->ePlan = FTS5_PLAN_SOURCE;
+    pCsr->pExpr = pTab->pSortCsr->pExpr;
+    rc = fts5CursorFirst(pTab, pCsr, bDesc);
+  }else if( pCsr->pExpr ){
+    assert( rc==SQLITE_OK );
+    rc = fts5CursorParseRank(pConfig, pCsr, pRank);
+    if( rc==SQLITE_OK ){
+      if( bOrderByRank ){
+        pCsr->ePlan = FTS5_PLAN_SORTED_MATCH;
+        rc = fts5CursorFirstSorted(pTab, pCsr, bDesc);
+      }else{
+        pCsr->ePlan = FTS5_PLAN_MATCH;
+        rc = fts5CursorFirst(pTab, pCsr, bDesc);
+      }
+    }
+  }else if( pConfig->zContent==0 ){
+    *pConfig->pzErrmsg = sqlite3_mprintf(
+        "%s: table does not support scanning", pConfig->zName
+    );
+    rc = SQLITE_ERROR;
+  }else{
+    /* This is either a full-table scan (ePlan==FTS5_PLAN_SCAN) or a lookup
+    ** by rowid (ePlan==FTS5_PLAN_ROWID).  */
+    pCsr->ePlan = (pRowidEq ? FTS5_PLAN_ROWID : FTS5_PLAN_SCAN);
+    rc = sqlite3Fts5StorageStmt(
+        pTab->pStorage, fts5StmtType(pCsr), &pCsr->pStmt, &pTab->p.base.zErrMsg
+    );
+    if( rc==SQLITE_OK ){
+      if( pRowidEq!=0 ){
+        assert( pCsr->ePlan==FTS5_PLAN_ROWID );
+        sqlite3_bind_value(pCsr->pStmt, 1, pRowidEq);
+      }else{
+        sqlite3_bind_int64(pCsr->pStmt, 1, pCsr->iFirstRowid);
+        sqlite3_bind_int64(pCsr->pStmt, 2, pCsr->iLastRowid);
+      }
+      rc = fts5NextMethod(pCursor);
+    }
+  }
+
+ filter_out:
+  sqlite3Fts5ExprFree(pExpr);
+  pConfig->pzErrmsg = pzErrmsg;
+  return rc;
+}
+
+/* 
+** This is the xEof method of the virtual table. SQLite calls this 
+** routine to find out if it has reached the end of a result set.
+*/
+static int fts5EofMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  return (CsrFlagTest(pCsr, FTS5CSR_EOF) ? 1 : 0);
+}
+
+/*
+** Return the rowid that the cursor currently points to.
+*/
+static i64 fts5CursorRowid(Fts5Cursor *pCsr){
+  assert( pCsr->ePlan==FTS5_PLAN_MATCH 
+       || pCsr->ePlan==FTS5_PLAN_SORTED_MATCH 
+       || pCsr->ePlan==FTS5_PLAN_SOURCE 
+  );
+  if( pCsr->pSorter ){
+    return pCsr->pSorter->iRowid;
+  }else{
+    return sqlite3Fts5ExprRowid(pCsr->pExpr);
+  }
+}
+
+/* 
+** This is the xRowid method. The SQLite core calls this routine to
+** retrieve the rowid for the current row of the result set. fts5
+** exposes %_content.rowid as the rowid for the virtual table. The
+** rowid should be written to *pRowid.
+*/
+static int fts5RowidMethod(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int ePlan = pCsr->ePlan;
+  
+  assert( CsrFlagTest(pCsr, FTS5CSR_EOF)==0 );
+  switch( ePlan ){
+    case FTS5_PLAN_SPECIAL:
+      *pRowid = 0;
+      break;
+
+    case FTS5_PLAN_SOURCE:
+    case FTS5_PLAN_MATCH:
+    case FTS5_PLAN_SORTED_MATCH:
+      *pRowid = fts5CursorRowid(pCsr);
+      break;
+
+    default:
+      *pRowid = sqlite3_column_int64(pCsr->pStmt, 0);
+      break;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** If the cursor requires seeking (bSeekRequired flag is set), seek it.
+** Return SQLITE_OK if no error occurs, or an SQLite error code otherwise.
+**
+** If argument bErrormsg is true and an error occurs, an error message may
+** be left in sqlite3_vtab.zErrMsg.
+*/
+static int fts5SeekCursor(Fts5Cursor *pCsr, int bErrormsg){
+  int rc = SQLITE_OK;
+
+  /* If the cursor does not yet have a statement handle, obtain one now. */ 
+  if( pCsr->pStmt==0 ){
+    Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+    int eStmt = fts5StmtType(pCsr);
+    rc = sqlite3Fts5StorageStmt(
+        pTab->pStorage, eStmt, &pCsr->pStmt, (bErrormsg?&pTab->p.base.zErrMsg:0)
+    );
+    assert( rc!=SQLITE_OK || pTab->p.base.zErrMsg==0 );
+    assert( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_CONTENT) );
+  }
+
+  if( rc==SQLITE_OK && CsrFlagTest(pCsr, FTS5CSR_REQUIRE_CONTENT) ){
+    Fts5Table *pTab = (Fts5Table*)(pCsr->base.pVtab);
+    assert( pCsr->pExpr );
+    sqlite3_reset(pCsr->pStmt);
+    sqlite3_bind_int64(pCsr->pStmt, 1, fts5CursorRowid(pCsr));
+    pTab->pConfig->bLock++;
+    rc = sqlite3_step(pCsr->pStmt);
+    pTab->pConfig->bLock--;
+    if( rc==SQLITE_ROW ){
+      rc = SQLITE_OK;
+      CsrFlagClear(pCsr, FTS5CSR_REQUIRE_CONTENT);
+    }else{
+      rc = sqlite3_reset(pCsr->pStmt);
+      if( rc==SQLITE_OK ){
+        rc = FTS5_CORRUPT;
+      }else if( pTab->pConfig->pzErrmsg ){
+        *pTab->pConfig->pzErrmsg = sqlite3_mprintf(
+            "%s", sqlite3_errmsg(pTab->pConfig->db)
+        );
+      }
+    }
+  }
+  return rc;
+}
+
+static void fts5SetVtabError(Fts5FullTable *p, const char *zFormat, ...){
+  va_list ap;                     /* ... printf arguments */
+  va_start(ap, zFormat);
+  assert( p->p.base.zErrMsg==0 );
+  p->p.base.zErrMsg = sqlite3_vmprintf(zFormat, ap);
+  va_end(ap);
+}
+
+/*
+** This function is called to handle an FTS INSERT command. In other words,
+** an INSERT statement of the form:
+**
+**     INSERT INTO fts(fts) VALUES($pCmd)
+**     INSERT INTO fts(fts, rank) VALUES($pCmd, $pVal)
+**
+** Argument pVal is the value assigned to column "fts" by the INSERT 
+** statement. This function returns SQLITE_OK if successful, or an SQLite
+** error code if an error occurs.
+**
+** The commands implemented by this function are documented in the "Special
+** INSERT Directives" section of the documentation. It should be updated if
+** more commands are added to this function.
+*/
+static int fts5SpecialInsert(
+  Fts5FullTable *pTab,            /* Fts5 table object */
+  const char *zCmd,               /* Text inserted into table-name column */
+  sqlite3_value *pVal             /* Value inserted into rank column */
+){
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int rc = SQLITE_OK;
+  int bError = 0;
+  int bLoadConfig = 0;
+
+  if( 0==sqlite3_stricmp("delete-all", zCmd) ){
+    if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+      fts5SetVtabError(pTab, 
+          "'delete-all' may only be used with a "
+          "contentless or external content fts5 table"
+      );
+      rc = SQLITE_ERROR;
+    }else{
+      rc = sqlite3Fts5StorageDeleteAll(pTab->pStorage);
+    }
+    bLoadConfig = 1;
+  }else if( 0==sqlite3_stricmp("rebuild", zCmd) ){
+    if( pConfig->eContent==FTS5_CONTENT_NONE ){
+      fts5SetVtabError(pTab, 
+          "'rebuild' may not be used with a contentless fts5 table"
+      );
+      rc = SQLITE_ERROR;
+    }else{
+      rc = sqlite3Fts5StorageRebuild(pTab->pStorage);
+    }
+    bLoadConfig = 1;
+  }else if( 0==sqlite3_stricmp("optimize", zCmd) ){
+    rc = sqlite3Fts5StorageOptimize(pTab->pStorage);
+  }else if( 0==sqlite3_stricmp("merge", zCmd) ){
+    int nMerge = sqlite3_value_int(pVal);
+    rc = sqlite3Fts5StorageMerge(pTab->pStorage, nMerge);
+  }else if( 0==sqlite3_stricmp("integrity-check", zCmd) ){
+    int iArg = sqlite3_value_int(pVal);
+    rc = sqlite3Fts5StorageIntegrity(pTab->pStorage, iArg);
+#ifdef SQLITE_DEBUG
+  }else if( 0==sqlite3_stricmp("prefix-index", zCmd) ){
+    pConfig->bPrefixIndex = sqlite3_value_int(pVal);
+#endif
+  }else if( 0==sqlite3_stricmp("flush", zCmd) ){
+    rc = sqlite3Fts5FlushToDisk(&pTab->p);
+  }else{
+    rc = sqlite3Fts5FlushToDisk(&pTab->p);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5IndexLoadConfig(pTab->p.pIndex);
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5ConfigSetValue(pTab->p.pConfig, zCmd, pVal, &bError);
+    }
+    if( rc==SQLITE_OK ){
+      if( bError ){
+        rc = SQLITE_ERROR;
+      }else{
+        rc = sqlite3Fts5StorageConfigValue(pTab->pStorage, zCmd, pVal, 0);
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK && bLoadConfig ){
+    pTab->p.pConfig->iCookie--;
+    rc = sqlite3Fts5IndexLoadConfig(pTab->p.pIndex);
+  }
+
+  return rc;
+}
+
+static int fts5SpecialDelete(
+  Fts5FullTable *pTab, 
+  sqlite3_value **apVal
+){
+  int rc = SQLITE_OK;
+  int eType1 = sqlite3_value_type(apVal[1]);
+  if( eType1==SQLITE_INTEGER ){
+    sqlite3_int64 iDel = sqlite3_value_int64(apVal[1]);
+    rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, &apVal[2]);
+  }
+  return rc;
+}
+
+static void fts5StorageInsert(
+  int *pRc, 
+  Fts5FullTable *pTab, 
+  sqlite3_value **apVal, 
+  i64 *piRowid
+){
+  int rc = *pRc;
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, apVal, piRowid);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal, *piRowid);
+  }
+  *pRc = rc;
+}
+
+/* 
+** This function is the implementation of the xUpdate callback used by 
+** FTS3 virtual tables. It is invoked by SQLite each time a row is to be
+** inserted, updated or deleted.
+**
+** A delete specifies a single argument - the rowid of the row to remove.
+** 
+** Update and insert operations pass:
+**
+**   1. The "old" rowid, or NULL.
+**   2. The "new" rowid.
+**   3. Values for each of the nCol matchable columns.
+**   4. Values for the two hidden columns (<tablename> and "rank").
+*/
+static int fts5UpdateMethod(
+  sqlite3_vtab *pVtab,            /* Virtual table handle */
+  int nArg,                       /* Size of argument array */
+  sqlite3_value **apVal,          /* Array of arguments */
+  sqlite_int64 *pRowid            /* OUT: The affected (or effected) rowid */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int eType0;                     /* value_type() of apVal[0] */
+  int rc = SQLITE_OK;             /* Return code */
+  int bUpdateOrDelete = 0;
+
+  /* A transaction must be open when this is called. */
+  assert( pTab->ts.eState==1 || pTab->ts.eState==2 );
+
+  assert( pVtab->zErrMsg==0 );
+  assert( nArg==1 || nArg==(2+pConfig->nCol+2) );
+  assert( sqlite3_value_type(apVal[0])==SQLITE_INTEGER 
+       || sqlite3_value_type(apVal[0])==SQLITE_NULL 
+  );
+  assert( pTab->p.pConfig->pzErrmsg==0 );
+  if( pConfig->pgsz==0 ){
+    rc = sqlite3Fts5IndexLoadConfig(pTab->p.pIndex);
+    if( rc!=SQLITE_OK ) return rc;
+  }
+
+  pTab->p.pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+
+  /* Put any active cursors into REQUIRE_SEEK state. */
+  fts5TripCursors(pTab);
+
+  eType0 = sqlite3_value_type(apVal[0]);
+  if( eType0==SQLITE_NULL 
+   && sqlite3_value_type(apVal[2+pConfig->nCol])!=SQLITE_NULL 
+  ){
+    /* A "special" INSERT op. These are handled separately. */
+    const char *z = (const char*)sqlite3_value_text(apVal[2+pConfig->nCol]);
+    if( pConfig->eContent!=FTS5_CONTENT_NORMAL 
+      && 0==sqlite3_stricmp("delete", z) 
+    ){
+      if( pConfig->bContentlessDelete ){
+        fts5SetVtabError(pTab, 
+            "'delete' may not be used with a contentless_delete=1 table"
+        );
+        rc = SQLITE_ERROR;
+      }else{
+        rc = fts5SpecialDelete(pTab, apVal);
+      }
+    }else{
+      rc = fts5SpecialInsert(pTab, z, apVal[2 + pConfig->nCol + 1]);
+    }
+  }else{
+    /* A regular INSERT, UPDATE or DELETE statement. The trick here is that
+    ** any conflict on the rowid value must be detected before any 
+    ** modifications are made to the database file. There are 4 cases:
+    **
+    **   1) DELETE
+    **   2) UPDATE (rowid not modified)
+    **   3) UPDATE (rowid modified)
+    **   4) INSERT
+    **
+    ** Cases 3 and 4 may violate the rowid constraint.
+    */
+    int eConflict = SQLITE_ABORT;
+    if( pConfig->eContent==FTS5_CONTENT_NORMAL || pConfig->bContentlessDelete ){
+      eConflict = sqlite3_vtab_on_conflict(pConfig->db);
+    }
+
+    assert( eType0==SQLITE_INTEGER || eType0==SQLITE_NULL );
+    assert( nArg!=1 || eType0==SQLITE_INTEGER );
+
+    /* Filter out attempts to run UPDATE or DELETE on contentless tables.
+    ** This is not suported. Except - they are both supported if the CREATE
+    ** VIRTUAL TABLE statement contained "contentless_delete=1". */
+    if( eType0==SQLITE_INTEGER 
+     && pConfig->eContent==FTS5_CONTENT_NONE 
+     && pConfig->bContentlessDelete==0
+    ){
+      pTab->p.base.zErrMsg = sqlite3_mprintf(
+          "cannot %s contentless fts5 table: %s", 
+          (nArg>1 ? "UPDATE" : "DELETE from"), pConfig->zName
+      );
+      rc = SQLITE_ERROR;
+    }
+
+    /* DELETE */
+    else if( nArg==1 ){
+      i64 iDel = sqlite3_value_int64(apVal[0]);  /* Rowid to delete */
+      rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, 0);
+      bUpdateOrDelete = 1;
+    }
+
+    /* INSERT or UPDATE */
+    else{
+      int eType1 = sqlite3_value_numeric_type(apVal[1]);
+
+      if( eType1!=SQLITE_INTEGER && eType1!=SQLITE_NULL ){
+        rc = SQLITE_MISMATCH;
+      }
+
+      else if( eType0!=SQLITE_INTEGER ){     
+        /* An INSERT statement. If the conflict-mode is REPLACE, first remove
+        ** the current entry (if any). */
+        if( eConflict==SQLITE_REPLACE && eType1==SQLITE_INTEGER ){
+          i64 iNew = sqlite3_value_int64(apVal[1]);  /* Rowid to delete */
+          rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0);
+          bUpdateOrDelete = 1;
+        }
+        fts5StorageInsert(&rc, pTab, apVal, pRowid);
+      }
+
+      /* UPDATE */
+      else{
+        i64 iOld = sqlite3_value_int64(apVal[0]);  /* Old rowid */
+        i64 iNew = sqlite3_value_int64(apVal[1]);  /* New rowid */
+        if( eType1==SQLITE_INTEGER && iOld!=iNew ){
+          if( eConflict==SQLITE_REPLACE ){
+            rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
+            if( rc==SQLITE_OK ){
+              rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0);
+            }
+            fts5StorageInsert(&rc, pTab, apVal, pRowid);
+          }else{
+            rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, apVal, pRowid);
+            if( rc==SQLITE_OK ){
+              rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
+            }
+            if( rc==SQLITE_OK ){
+              rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal,*pRowid);
+            }
+          }
+        }else{
+          rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
+          fts5StorageInsert(&rc, pTab, apVal, pRowid);
+        }
+        bUpdateOrDelete = 1;
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK 
+   && bUpdateOrDelete 
+   && pConfig->bSecureDelete 
+   && pConfig->iVersion==FTS5_CURRENT_VERSION 
+  ){
+    rc = sqlite3Fts5StorageConfigValue(
+        pTab->pStorage, "version", 0, FTS5_CURRENT_VERSION_SECUREDELETE
+    );
+    if( rc==SQLITE_OK ){
+      pConfig->iVersion = FTS5_CURRENT_VERSION_SECUREDELETE;
+    }
+  }
+
+  pTab->p.pConfig->pzErrmsg = 0;
+  return rc;
+}
+
+/*
+** Implementation of xSync() method. 
+*/
+static int fts5SyncMethod(sqlite3_vtab *pVtab){
+  int rc;
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  fts5CheckTransactionState(pTab, FTS5_SYNC, 0);
+  pTab->p.pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+  rc = sqlite3Fts5FlushToDisk(&pTab->p);
+  pTab->p.pConfig->pzErrmsg = 0;
+  return rc;
+}
+
+/*
+** Implementation of xBegin() method. 
+*/
+static int fts5BeginMethod(sqlite3_vtab *pVtab){
+  fts5CheckTransactionState((Fts5FullTable*)pVtab, FTS5_BEGIN, 0);
+  fts5NewTransaction((Fts5FullTable*)pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Implementation of xCommit() method. This is a no-op. The contents of
+** the pending-terms hash-table have already been flushed into the database
+** by fts5SyncMethod().
+*/
+static int fts5CommitMethod(sqlite3_vtab *pVtab){
+  UNUSED_PARAM(pVtab);  /* Call below is a no-op for NDEBUG builds */
+  fts5CheckTransactionState((Fts5FullTable*)pVtab, FTS5_COMMIT, 0);
+  return SQLITE_OK;
+}
+
+/*
+** Implementation of xRollback(). Discard the contents of the pending-terms
+** hash-table. Any changes made to the database are reverted by SQLite.
+*/
+static int fts5RollbackMethod(sqlite3_vtab *pVtab){
+  int rc;
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  fts5CheckTransactionState(pTab, FTS5_ROLLBACK, 0);
+  rc = sqlite3Fts5StorageRollback(pTab->pStorage);
+  return rc;
+}
+
+static int fts5CsrPoslist(Fts5Cursor*, int, const u8**, int*);
+
+static void *fts5ApiUserData(Fts5Context *pCtx){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return pCsr->pAux->pUserData;
+}
+
+static int fts5ApiColumnCount(Fts5Context *pCtx){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return ((Fts5Table*)(pCsr->base.pVtab))->pConfig->nCol;
+}
+
+static int fts5ApiColumnTotalSize(
+  Fts5Context *pCtx, 
+  int iCol, 
+  sqlite3_int64 *pnToken
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  return sqlite3Fts5StorageSize(pTab->pStorage, iCol, pnToken);
+}
+
+static int fts5ApiRowCount(Fts5Context *pCtx, i64 *pnRow){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  return sqlite3Fts5StorageRowCount(pTab->pStorage, pnRow);
+}
+
+static int fts5ApiTokenize(
+  Fts5Context *pCtx, 
+  const char *pText, int nText, 
+  void *pUserData,
+  int (*xToken)(void*, int, const char*, int, int, int)
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Table *pTab = (Fts5Table*)(pCsr->base.pVtab);
+  return sqlite3Fts5Tokenize(
+      pTab->pConfig, FTS5_TOKENIZE_AUX, pText, nText, pUserData, xToken
+  );
+}
+
+static int fts5ApiPhraseCount(Fts5Context *pCtx){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+}
+
+static int fts5ApiPhraseSize(Fts5Context *pCtx, int iPhrase){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return sqlite3Fts5ExprPhraseSize(pCsr->pExpr, iPhrase);
+}
+
+static int fts5ApiColumnText(
+  Fts5Context *pCtx, 
+  int iCol, 
+  const char **pz, 
+  int *pn
+){
+  int rc = SQLITE_OK;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Table *pTab = (Fts5Table*)(pCsr->base.pVtab);
+  if( iCol<0 || iCol>=pTab->pConfig->nCol ){
+    rc = SQLITE_RANGE;
+  }else if( fts5IsContentless((Fts5FullTable*)(pCsr->base.pVtab)) 
+   || pCsr->ePlan==FTS5_PLAN_SPECIAL 
+  ){
+    *pz = 0;
+    *pn = 0;
+  }else{
+    rc = fts5SeekCursor(pCsr, 0);
+    if( rc==SQLITE_OK ){
+      *pz = (const char*)sqlite3_column_text(pCsr->pStmt, iCol+1);
+      *pn = sqlite3_column_bytes(pCsr->pStmt, iCol+1);
+    }
+  }
+  return rc;
+}
+
+static int fts5CsrPoslist(
+  Fts5Cursor *pCsr, 
+  int iPhrase, 
+  const u8 **pa,
+  int *pn
+){
+  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;
+  int rc = SQLITE_OK;
+  int bLive = (pCsr->pSorter==0);
+
+  if( iPhrase<0 || iPhrase>=sqlite3Fts5ExprPhraseCount(pCsr->pExpr) ){
+    rc = SQLITE_RANGE;
+  }else if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_POSLIST) ){
+    if( pConfig->eDetail!=FTS5_DETAIL_FULL ){
+      Fts5PoslistPopulator *aPopulator;
+      int i;
+      aPopulator = sqlite3Fts5ExprClearPoslists(pCsr->pExpr, bLive);
+      if( aPopulator==0 ) rc = SQLITE_NOMEM;
+      for(i=0; i<pConfig->nCol && rc==SQLITE_OK; i++){
+        int n; const char *z;
+        rc = fts5ApiColumnText((Fts5Context*)pCsr, i, &z, &n);
+        if( rc==SQLITE_OK ){
+          rc = sqlite3Fts5ExprPopulatePoslists(
+              pConfig, pCsr->pExpr, aPopulator, i, z, n
+          );
+        }
+      }
+      sqlite3_free(aPopulator);
+
+      if( pCsr->pSorter ){
+        sqlite3Fts5ExprCheckPoslists(pCsr->pExpr, pCsr->pSorter->iRowid);
+      }
+    }
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_POSLIST);
+  }
+
+  if( rc==SQLITE_OK ){
+    if( pCsr->pSorter && pConfig->eDetail==FTS5_DETAIL_FULL ){
+      Fts5Sorter *pSorter = pCsr->pSorter;
+      int i1 = (iPhrase==0 ? 0 : pSorter->aIdx[iPhrase-1]);
+      *pn = pSorter->aIdx[iPhrase] - i1;
+      *pa = &pSorter->aPoslist[i1];
+    }else{
+      *pn = sqlite3Fts5ExprPoslist(pCsr->pExpr, iPhrase, pa);
+    }
+  }else{
+    *pa = 0;
+    *pn = 0;
+  }
+
+
+  return rc;
+}
+
+/*
+** Ensure that the Fts5Cursor.nInstCount and aInst[] variables are populated
+** correctly for the current view. Return SQLITE_OK if successful, or an
+** SQLite error code otherwise.
+*/
+static int fts5CacheInstArray(Fts5Cursor *pCsr){
+  int rc = SQLITE_OK;
+  Fts5PoslistReader *aIter;       /* One iterator for each phrase */
+  int nIter;                      /* Number of iterators/phrases */
+  int nCol = ((Fts5Table*)pCsr->base.pVtab)->pConfig->nCol;
+  
+  nIter = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+  if( pCsr->aInstIter==0 ){
+    sqlite3_int64 nByte = sizeof(Fts5PoslistReader) * nIter;
+    pCsr->aInstIter = (Fts5PoslistReader*)sqlite3Fts5MallocZero(&rc, nByte);
+  }
+  aIter = pCsr->aInstIter;
+
+  if( aIter ){
+    int nInst = 0;                /* Number instances seen so far */
+    int i;
+
+    /* Initialize all iterators */
+    for(i=0; i<nIter && rc==SQLITE_OK; i++){
+      const u8 *a;
+      int n; 
+      rc = fts5CsrPoslist(pCsr, i, &a, &n);
+      if( rc==SQLITE_OK ){
+        sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      while( 1 ){
+        int *aInst;
+        int iBest = -1;
+        for(i=0; i<nIter; i++){
+          if( (aIter[i].bEof==0) 
+              && (iBest<0 || aIter[i].iPos<aIter[iBest].iPos) 
+            ){
+            iBest = i;
+          }
+        }
+        if( iBest<0 ) break;
+
+        nInst++;
+        if( nInst>=pCsr->nInstAlloc ){
+          int nNewSize = pCsr->nInstAlloc ? pCsr->nInstAlloc*2 : 32;
+          aInst = (int*)sqlite3_realloc64(
+              pCsr->aInst, nNewSize*sizeof(int)*3
+              );
+          if( aInst ){
+            pCsr->aInst = aInst;
+            pCsr->nInstAlloc = nNewSize;
+          }else{
+            nInst--;
+            rc = SQLITE_NOMEM;
+            break;
+          }
+        }
+
+        aInst = &pCsr->aInst[3 * (nInst-1)];
+        aInst[0] = iBest;
+        aInst[1] = FTS5_POS2COLUMN(aIter[iBest].iPos);
+        aInst[2] = FTS5_POS2OFFSET(aIter[iBest].iPos);
+        if( aInst[1]<0 || aInst[1]>=nCol ){
+          rc = FTS5_CORRUPT;
+          break;
+        }
+        sqlite3Fts5PoslistReaderNext(&aIter[iBest]);
+      }
+    }
+
+    pCsr->nInstCount = nInst;
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_INST);
+  }
+  return rc;
+}
+
+static int fts5ApiInstCount(Fts5Context *pCtx, int *pnInst){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  int rc = SQLITE_OK;
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0 
+   || SQLITE_OK==(rc = fts5CacheInstArray(pCsr)) ){
+    *pnInst = pCsr->nInstCount;
+  }
+  return rc;
+}
+
+static int fts5ApiInst(
+  Fts5Context *pCtx, 
+  int iIdx, 
+  int *piPhrase, 
+  int *piCol, 
+  int *piOff
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  int rc = SQLITE_OK;
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0 
+   || SQLITE_OK==(rc = fts5CacheInstArray(pCsr)) 
+  ){
+    if( iIdx<0 || iIdx>=pCsr->nInstCount ){
+      rc = SQLITE_RANGE;
+    }else{
+      *piPhrase = pCsr->aInst[iIdx*3];
+      *piCol = pCsr->aInst[iIdx*3 + 1];
+      *piOff = pCsr->aInst[iIdx*3 + 2];
+    }
+  }
+  return rc;
+}
+
+static sqlite3_int64 fts5ApiRowid(Fts5Context *pCtx){
+  return fts5CursorRowid((Fts5Cursor*)pCtx);
+}
+
+static int fts5ColumnSizeCb(
+  void *pContext,                 /* Pointer to int */
+  int tflags,
+  const char *pUnused,            /* Buffer containing token */
+  int nUnused,                    /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  int *pCnt = (int*)pContext;
+  UNUSED_PARAM2(pUnused, nUnused);
+  UNUSED_PARAM2(iUnused1, iUnused2);
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 ){
+    (*pCnt)++;
+  }
+  return SQLITE_OK;
+}
+
+static int fts5ApiColumnSize(Fts5Context *pCtx, int iCol, int *pnToken){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int rc = SQLITE_OK;
+
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_DOCSIZE) ){
+    if( pConfig->bColumnsize ){
+      i64 iRowid = fts5CursorRowid(pCsr);
+      rc = sqlite3Fts5StorageDocsize(pTab->pStorage, iRowid, pCsr->aColumnSize);
+    }else if( pConfig->zContent==0 ){
+      int i;
+      for(i=0; i<pConfig->nCol; i++){
+        if( pConfig->abUnindexed[i]==0 ){
+          pCsr->aColumnSize[i] = -1;
+        }
+      }
+    }else{
+      int i;
+      for(i=0; rc==SQLITE_OK && i<pConfig->nCol; i++){
+        if( pConfig->abUnindexed[i]==0 ){
+          const char *z; int n;
+          void *p = (void*)(&pCsr->aColumnSize[i]);
+          pCsr->aColumnSize[i] = 0;
+          rc = fts5ApiColumnText(pCtx, i, &z, &n);
+          if( rc==SQLITE_OK ){
+            rc = sqlite3Fts5Tokenize(
+                pConfig, FTS5_TOKENIZE_AUX, z, n, p, fts5ColumnSizeCb
+            );
+          }
+        }
+      }
+    }
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_DOCSIZE);
+  }
+  if( iCol<0 ){
+    int i;
+    *pnToken = 0;
+    for(i=0; i<pConfig->nCol; i++){
+      *pnToken += pCsr->aColumnSize[i];
+    }
+  }else if( iCol<pConfig->nCol ){
+    *pnToken = pCsr->aColumnSize[iCol];
+  }else{
+    *pnToken = 0;
+    rc = SQLITE_RANGE;
+  }
+  return rc;
+}
+
+/*
+** Implementation of the xSetAuxdata() method.
+*/
+static int fts5ApiSetAuxdata(
+  Fts5Context *pCtx,              /* Fts5 context */
+  void *pPtr,                     /* Pointer to save as auxdata */
+  void(*xDelete)(void*)           /* Destructor for pPtr (or NULL) */
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Auxdata *pData;
+
+  /* Search through the cursors list of Fts5Auxdata objects for one that
+  ** corresponds to the currently executing auxiliary function.  */
+  for(pData=pCsr->pAuxdata; pData; pData=pData->pNext){
+    if( pData->pAux==pCsr->pAux ) break;
+  }
+
+  if( pData ){
+    if( pData->xDelete ){
+      pData->xDelete(pData->pPtr);
+    }
+  }else{
+    int rc = SQLITE_OK;
+    pData = (Fts5Auxdata*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5Auxdata));
+    if( pData==0 ){
+      if( xDelete ) xDelete(pPtr);
+      return rc;
+    }
+    pData->pAux = pCsr->pAux;
+    pData->pNext = pCsr->pAuxdata;
+    pCsr->pAuxdata = pData;
+  }
+
+  pData->xDelete = xDelete;
+  pData->pPtr = pPtr;
+  return SQLITE_OK;
+}
+
+static void *fts5ApiGetAuxdata(Fts5Context *pCtx, int bClear){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Auxdata *pData;
+  void *pRet = 0;
+
+  for(pData=pCsr->pAuxdata; pData; pData=pData->pNext){
+    if( pData->pAux==pCsr->pAux ) break;
+  }
+
+  if( pData ){
+    pRet = pData->pPtr;
+    if( bClear ){
+      pData->pPtr = 0;
+      pData->xDelete = 0;
+    }
+  }
+
+  return pRet;
+}
+
+static void fts5ApiPhraseNext(
+  Fts5Context *pUnused, 
+  Fts5PhraseIter *pIter, 
+  int *piCol, int *piOff
+){
+  UNUSED_PARAM(pUnused);
+  if( pIter->a>=pIter->b ){
+    *piCol = -1;
+    *piOff = -1;
+  }else{
+    int iVal;
+    pIter->a += fts5GetVarint32(pIter->a, iVal);
+    if( iVal==1 ){
+      pIter->a += fts5GetVarint32(pIter->a, iVal);
+      *piCol = iVal;
+      *piOff = 0;
+      pIter->a += fts5GetVarint32(pIter->a, iVal);
+    }
+    *piOff += (iVal-2);
+  }
+}
+
+static int fts5ApiPhraseFirst(
+  Fts5Context *pCtx, 
+  int iPhrase, 
+  Fts5PhraseIter *pIter, 
+  int *piCol, int *piOff
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  int n;
+  int rc = fts5CsrPoslist(pCsr, iPhrase, &pIter->a, &n);
+  if( rc==SQLITE_OK ){
+    assert( pIter->a || n==0 );
+    pIter->b = (pIter->a ? &pIter->a[n] : 0);
+    *piCol = 0;
+    *piOff = 0;
+    fts5ApiPhraseNext(pCtx, pIter, piCol, piOff);
+  }
+  return rc;
+}
+
+static void fts5ApiPhraseNextColumn(
+  Fts5Context *pCtx, 
+  Fts5PhraseIter *pIter, 
+  int *piCol
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;
+
+  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+    if( pIter->a>=pIter->b ){
+      *piCol = -1;
+    }else{
+      int iIncr;
+      pIter->a += fts5GetVarint32(&pIter->a[0], iIncr);
+      *piCol += (iIncr-2);
+    }
+  }else{
+    while( 1 ){
+      int dummy;
+      if( pIter->a>=pIter->b ){
+        *piCol = -1;
+        return;
+      }
+      if( pIter->a[0]==0x01 ) break;
+      pIter->a += fts5GetVarint32(pIter->a, dummy);
+    }
+    pIter->a += 1 + fts5GetVarint32(&pIter->a[1], *piCol);
+  }
+}
+
+static int fts5ApiPhraseFirstColumn(
+  Fts5Context *pCtx, 
+  int iPhrase, 
+  Fts5PhraseIter *pIter, 
+  int *piCol
+){
+  int rc = SQLITE_OK;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;
+
+  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+    Fts5Sorter *pSorter = pCsr->pSorter;
+    int n;
+    if( pSorter ){
+      int i1 = (iPhrase==0 ? 0 : pSorter->aIdx[iPhrase-1]);
+      n = pSorter->aIdx[iPhrase] - i1;
+      pIter->a = &pSorter->aPoslist[i1];
+    }else{
+      rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, iPhrase, &pIter->a, &n);
+    }
+    if( rc==SQLITE_OK ){
+      assert( pIter->a || n==0 );
+      pIter->b = (pIter->a ? &pIter->a[n] : 0);
+      *piCol = 0;
+      fts5ApiPhraseNextColumn(pCtx, pIter, piCol);
+    }
+  }else{
+    int n;
+    rc = fts5CsrPoslist(pCsr, iPhrase, &pIter->a, &n);
+    if( rc==SQLITE_OK ){
+      assert( pIter->a || n==0 );
+      pIter->b = (pIter->a ? &pIter->a[n] : 0);
+      if( n<=0 ){
+        *piCol = -1;
+      }else if( pIter->a[0]==0x01 ){
+        pIter->a += 1 + fts5GetVarint32(&pIter->a[1], *piCol);
+      }else{
+        *piCol = 0;
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** xQueryToken() API implemenetation.
+*/
+static int fts5ApiQueryToken(
+  Fts5Context* pCtx, 
+  int iPhrase, 
+  int iToken, 
+  const char **ppOut, 
+  int *pnOut
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return sqlite3Fts5ExprQueryToken(pCsr->pExpr, iPhrase, iToken, ppOut, pnOut);
+}
+
+/*
+** xInstToken() API implemenetation.
+*/
+static int fts5ApiInstToken(
+  Fts5Context *pCtx,
+  int iIdx, 
+  int iToken,
+  const char **ppOut, int *pnOut
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  int rc = SQLITE_OK;
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0 
+   || SQLITE_OK==(rc = fts5CacheInstArray(pCsr)) 
+  ){
+    if( iIdx<0 || iIdx>=pCsr->nInstCount ){
+      rc = SQLITE_RANGE;
+    }else{
+      int iPhrase = pCsr->aInst[iIdx*3];
+      int iCol = pCsr->aInst[iIdx*3 + 1];
+      int iOff = pCsr->aInst[iIdx*3 + 2];
+      i64 iRowid = fts5CursorRowid(pCsr);
+      rc = sqlite3Fts5ExprInstToken(
+          pCsr->pExpr, iRowid, iPhrase, iCol, iOff, iToken, ppOut, pnOut
+      );
+    }
+  }
+  return rc;
+}
+
+
+static int fts5ApiQueryPhrase(Fts5Context*, int, void*, 
+    int(*)(const Fts5ExtensionApi*, Fts5Context*, void*)
+);
+
+static const Fts5ExtensionApi sFts5Api = {
+  3,                            /* iVersion */
+  fts5ApiUserData,
+  fts5ApiColumnCount,
+  fts5ApiRowCount,
+  fts5ApiColumnTotalSize,
+  fts5ApiTokenize,
+  fts5ApiPhraseCount,
+  fts5ApiPhraseSize,
+  fts5ApiInstCount,
+  fts5ApiInst,
+  fts5ApiRowid,
+  fts5ApiColumnText,
+  fts5ApiColumnSize,
+  fts5ApiQueryPhrase,
+  fts5ApiSetAuxdata,
+  fts5ApiGetAuxdata,
+  fts5ApiPhraseFirst,
+  fts5ApiPhraseNext,
+  fts5ApiPhraseFirstColumn,
+  fts5ApiPhraseNextColumn,
+  fts5ApiQueryToken,
+  fts5ApiInstToken
+};
+
+/*
+** Implementation of API function xQueryPhrase().
+*/
+static int fts5ApiQueryPhrase(
+  Fts5Context *pCtx, 
+  int iPhrase, 
+  void *pUserData,
+  int(*xCallback)(const Fts5ExtensionApi*, Fts5Context*, void*)
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  int rc;
+  Fts5Cursor *pNew = 0;
+
+  rc = fts5OpenMethod(pCsr->base.pVtab, (sqlite3_vtab_cursor**)&pNew);
+  if( rc==SQLITE_OK ){
+    pNew->ePlan = FTS5_PLAN_MATCH;
+    pNew->iFirstRowid = SMALLEST_INT64;
+    pNew->iLastRowid = LARGEST_INT64;
+    pNew->base.pVtab = (sqlite3_vtab*)pTab;
+    rc = sqlite3Fts5ExprClonePhrase(pCsr->pExpr, iPhrase, &pNew->pExpr);
+  }
+
+  if( rc==SQLITE_OK ){
+    for(rc = fts5CursorFirst(pTab, pNew, 0);
+        rc==SQLITE_OK && CsrFlagTest(pNew, FTS5CSR_EOF)==0;
+        rc = fts5NextMethod((sqlite3_vtab_cursor*)pNew)
+    ){
+      rc = xCallback(&sFts5Api, (Fts5Context*)pNew, pUserData);
+      if( rc!=SQLITE_OK ){
+        if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+        break;
+      }
+    }
+  }
+
+  fts5CloseMethod((sqlite3_vtab_cursor*)pNew);
+  return rc;
+}
+
+static void fts5ApiInvoke(
+  Fts5Auxiliary *pAux,
+  Fts5Cursor *pCsr,
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  assert( pCsr->pAux==0 );
+  pCsr->pAux = pAux;
+  pAux->xFunc(&sFts5Api, (Fts5Context*)pCsr, context, argc, argv);
+  pCsr->pAux = 0;
+}
+
+static Fts5Cursor *fts5CursorFromCsrid(Fts5Global *pGlobal, i64 iCsrId){
+  Fts5Cursor *pCsr;
+  for(pCsr=pGlobal->pCsr; pCsr; pCsr=pCsr->pNext){
+    if( pCsr->iCsrId==iCsrId ) break;
+  }
+  return pCsr;
+}
+
+static void fts5ApiCallback(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+
+  Fts5Auxiliary *pAux;
+  Fts5Cursor *pCsr;
+  i64 iCsrId;
+
+  assert( argc>=1 );
+  pAux = (Fts5Auxiliary*)sqlite3_user_data(context);
+  iCsrId = sqlite3_value_int64(argv[0]);
+
+  pCsr = fts5CursorFromCsrid(pAux->pGlobal, iCsrId);
+  if( pCsr==0 || pCsr->ePlan==0 ){
+    char *zErr = sqlite3_mprintf("no such cursor: %lld", iCsrId);
+    sqlite3_result_error(context, zErr, -1);
+    sqlite3_free(zErr);
+  }else{
+    fts5ApiInvoke(pAux, pCsr, context, argc-1, &argv[1]);
+  }
+}
+
+
+/*
+** Given cursor id iId, return a pointer to the corresponding Fts5Table 
+** object. Or NULL If the cursor id does not exist.
+*/
+static Fts5Table *sqlite3Fts5TableFromCsrid(
+  Fts5Global *pGlobal,            /* FTS5 global context for db handle */
+  i64 iCsrId                      /* Id of cursor to find */
+){
+  Fts5Cursor *pCsr;
+  pCsr = fts5CursorFromCsrid(pGlobal, iCsrId);
+  if( pCsr ){
+    return (Fts5Table*)pCsr->base.pVtab;
+  }
+  return 0;
+}
+
+/*
+** Return a "position-list blob" corresponding to the current position of
+** cursor pCsr via sqlite3_result_blob(). A position-list blob contains
+** the current position-list for each phrase in the query associated with
+** cursor pCsr.
+**
+** A position-list blob begins with (nPhrase-1) varints, where nPhrase is
+** the number of phrases in the query. Following the varints are the
+** concatenated position lists for each phrase, in order.
+**
+** The first varint (if it exists) contains the size of the position list
+** for phrase 0. The second (same disclaimer) contains the size of position
+** list 1. And so on. There is no size field for the final position list,
+** as it can be derived from the total size of the blob.
+*/
+static int fts5PoslistBlob(sqlite3_context *pCtx, Fts5Cursor *pCsr){
+  int i;
+  int rc = SQLITE_OK;
+  int nPhrase = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+  Fts5Buffer val;
+
+  memset(&val, 0, sizeof(Fts5Buffer));
+  switch( ((Fts5Table*)(pCsr->base.pVtab))->pConfig->eDetail ){
+    case FTS5_DETAIL_FULL:
+
+      /* Append the varints */
+      for(i=0; i<(nPhrase-1); i++){
+        const u8 *dummy;
+        int nByte = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &dummy);
+        sqlite3Fts5BufferAppendVarint(&rc, &val, nByte);
+      }
+
+      /* Append the position lists */
+      for(i=0; i<nPhrase; i++){
+        const u8 *pPoslist;
+        int nPoslist;
+        nPoslist = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &pPoslist);
+        sqlite3Fts5BufferAppendBlob(&rc, &val, nPoslist, pPoslist);
+      }
+      break;
+
+    case FTS5_DETAIL_COLUMNS:
+
+      /* Append the varints */
+      for(i=0; rc==SQLITE_OK && i<(nPhrase-1); i++){
+        const u8 *dummy;
+        int nByte;
+        rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, i, &dummy, &nByte);
+        sqlite3Fts5BufferAppendVarint(&rc, &val, nByte);
+      }
+
+      /* Append the position lists */
+      for(i=0; rc==SQLITE_OK && i<nPhrase; i++){
+        const u8 *pPoslist;
+        int nPoslist;
+        rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, i, &pPoslist, &nPoslist);
+        sqlite3Fts5BufferAppendBlob(&rc, &val, nPoslist, pPoslist);
+      }
+      break;
+
+    default:
+      break;
+  }
+
+  sqlite3_result_blob(pCtx, val.p, val.n, sqlite3_free);
+  return rc;
+}
+
+/* 
+** This is the xColumn method, called by SQLite to request a value from
+** the row that the supplied cursor currently points to.
+*/
+static int fts5ColumnMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
+  int iCol                        /* Index of column to read value from */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCursor->pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int rc = SQLITE_OK;
+  
+  assert( CsrFlagTest(pCsr, FTS5CSR_EOF)==0 );
+
+  if( pCsr->ePlan==FTS5_PLAN_SPECIAL ){
+    if( iCol==pConfig->nCol ){
+      sqlite3_result_int64(pCtx, pCsr->iSpecial);
+    }
+  }else
+
+  if( iCol==pConfig->nCol ){
+    /* User is requesting the value of the special column with the same name
+    ** as the table. Return the cursor integer id number. This value is only
+    ** useful in that it may be passed as the first argument to an FTS5
+    ** auxiliary function.  */
+    sqlite3_result_int64(pCtx, pCsr->iCsrId);
+  }else if( iCol==pConfig->nCol+1 ){
+
+    /* The value of the "rank" column. */
+    if( pCsr->ePlan==FTS5_PLAN_SOURCE ){
+      fts5PoslistBlob(pCtx, pCsr);
+    }else if( 
+        pCsr->ePlan==FTS5_PLAN_MATCH
+     || pCsr->ePlan==FTS5_PLAN_SORTED_MATCH
+    ){
+      if( pCsr->pRank || SQLITE_OK==(rc = fts5FindRankFunction(pCsr)) ){
+        fts5ApiInvoke(pCsr->pRank, pCsr, pCtx, pCsr->nRankArg, pCsr->apRankArg);
+      }
+    }
+  }else if( !fts5IsContentless(pTab) ){
+    pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+    rc = fts5SeekCursor(pCsr, 1);
+    if( rc==SQLITE_OK ){
+      sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pStmt, iCol+1));
+    }
+    pConfig->pzErrmsg = 0;
+  }else if( pConfig->bContentlessDelete && sqlite3_vtab_nochange(pCtx) ){
+    char *zErr = sqlite3_mprintf("cannot UPDATE a subset of "
+        "columns on fts5 contentless-delete table: %s", pConfig->zName
+    );
+    sqlite3_result_error(pCtx, zErr, -1);
+    sqlite3_free(zErr);
+  }
+  return rc;
+}
+
+
+/*
+** This routine implements the xFindFunction method for the FTS3
+** virtual table.
+*/
+static int fts5FindFunctionMethod(
+  sqlite3_vtab *pVtab,            /* Virtual table handle */
+  int nUnused,                    /* Number of SQL function arguments */
+  const char *zName,              /* Name of SQL function */
+  void (**pxFunc)(sqlite3_context*,int,sqlite3_value**), /* OUT: Result */
+  void **ppArg                    /* OUT: User data for *pxFunc */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  Fts5Auxiliary *pAux;
+
+  UNUSED_PARAM(nUnused);
+  pAux = fts5FindAuxiliary(pTab, zName);
+  if( pAux ){
+    *pxFunc = fts5ApiCallback;
+    *ppArg = (void*)pAux;
+    return 1;
+  }
+
+  /* No function of the specified name was found. Return 0. */
+  return 0;
+}
+
+/*
+** Implementation of FTS5 xRename method. Rename an fts5 table.
+*/
+static int fts5RenameMethod(
+  sqlite3_vtab *pVtab,            /* Virtual table handle */
+  const char *zName               /* New name of table */
+){
+  int rc;
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  rc = sqlite3Fts5StorageRename(pTab->pStorage, zName);
+  return rc;
+}
+
+static int sqlite3Fts5FlushToDisk(Fts5Table *pTab){
+  fts5TripCursors((Fts5FullTable*)pTab);
+  return sqlite3Fts5StorageSync(((Fts5FullTable*)pTab)->pStorage);
+}
+
+/*
+** The xSavepoint() method.
+**
+** Flush the contents of the pending-terms table to disk.
+*/
+static int fts5SavepointMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  int rc = SQLITE_OK;
+
+  fts5CheckTransactionState(pTab, FTS5_SAVEPOINT, iSavepoint);
+  rc = sqlite3Fts5FlushToDisk((Fts5Table*)pVtab);
+  if( rc==SQLITE_OK ){
+    pTab->iSavepoint = iSavepoint+1;
+  }
+  return rc;
+}
+
+/*
+** The xRelease() method.
+**
+** This is a no-op.
+*/
+static int fts5ReleaseMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  int rc = SQLITE_OK;
+  fts5CheckTransactionState(pTab, FTS5_RELEASE, iSavepoint);
+  if( (iSavepoint+1)<pTab->iSavepoint ){
+    rc = sqlite3Fts5FlushToDisk(&pTab->p);
+    if( rc==SQLITE_OK ){
+      pTab->iSavepoint = iSavepoint;
+    }
+  }
+  return rc;
+}
+
+/*
+** The xRollbackTo() method.
+**
+** Discard the contents of the pending terms table.
+*/
+static int fts5RollbackToMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  int rc = SQLITE_OK;
+  fts5CheckTransactionState(pTab, FTS5_ROLLBACKTO, iSavepoint);
+  fts5TripCursors(pTab);
+  if( (iSavepoint+1)<=pTab->iSavepoint ){
+    pTab->p.pConfig->pgsz = 0;
+    rc = sqlite3Fts5StorageRollback(pTab->pStorage);
+  }
+  return rc;
+}
+
+/*
+** Register a new auxiliary function with global context pGlobal.
+*/
+static int fts5CreateAux(
+  fts5_api *pApi,                 /* Global context (one per db handle) */
+  const char *zName,              /* Name of new function */
+  void *pUserData,                /* User data for aux. function */
+  fts5_extension_function xFunc,  /* Aux. function implementation */
+  void(*xDestroy)(void*)          /* Destructor for pUserData */
+){
+  Fts5Global *pGlobal = (Fts5Global*)pApi;
+  int rc = sqlite3_overload_function(pGlobal->db, zName, -1);
+  if( rc==SQLITE_OK ){
+    Fts5Auxiliary *pAux;
+    sqlite3_int64 nName;            /* Size of zName in bytes, including \0 */
+    sqlite3_int64 nByte;            /* Bytes of space to allocate */
+
+    nName = strlen(zName) + 1;
+    nByte = sizeof(Fts5Auxiliary) + nName;
+    pAux = (Fts5Auxiliary*)sqlite3_malloc64(nByte);
+    if( pAux ){
+      memset(pAux, 0, (size_t)nByte);
+      pAux->zFunc = (char*)&pAux[1];
+      memcpy(pAux->zFunc, zName, nName);
+      pAux->pGlobal = pGlobal;
+      pAux->pUserData = pUserData;
+      pAux->xFunc = xFunc;
+      pAux->xDestroy = xDestroy;
+      pAux->pNext = pGlobal->pAux;
+      pGlobal->pAux = pAux;
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Register a new tokenizer. This is the implementation of the 
+** fts5_api.xCreateTokenizer() method.
+*/
+static int fts5CreateTokenizer(
+  fts5_api *pApi,                 /* Global context (one per db handle) */
+  const char *zName,              /* Name of new function */
+  void *pUserData,                /* User data for aux. function */
+  fts5_tokenizer *pTokenizer,     /* Tokenizer implementation */
+  void(*xDestroy)(void*)          /* Destructor for pUserData */
+){
+  Fts5Global *pGlobal = (Fts5Global*)pApi;
+  Fts5TokenizerModule *pNew;
+  sqlite3_int64 nName;            /* Size of zName and its \0 terminator */
+  sqlite3_int64 nByte;            /* Bytes of space to allocate */
+  int rc = SQLITE_OK;
+
+  nName = strlen(zName) + 1;
+  nByte = sizeof(Fts5TokenizerModule) + nName;
+  pNew = (Fts5TokenizerModule*)sqlite3_malloc64(nByte);
+  if( pNew ){
+    memset(pNew, 0, (size_t)nByte);
+    pNew->zName = (char*)&pNew[1];
+    memcpy(pNew->zName, zName, nName);
+    pNew->pUserData = pUserData;
+    pNew->x = *pTokenizer;
+    pNew->xDestroy = xDestroy;
+    pNew->pNext = pGlobal->pTok;
+    pGlobal->pTok = pNew;
+    if( pNew->pNext==0 ){
+      pGlobal->pDfltTok = pNew;
+    }
+  }else{
+    rc = SQLITE_NOMEM;
+  }
+
+  return rc;
+}
+
+static Fts5TokenizerModule *fts5LocateTokenizer(
+  Fts5Global *pGlobal, 
+  const char *zName
+){
+  Fts5TokenizerModule *pMod = 0;
+
+  if( zName==0 ){
+    pMod = pGlobal->pDfltTok;
+  }else{
+    for(pMod=pGlobal->pTok; pMod; pMod=pMod->pNext){
+      if( sqlite3_stricmp(zName, pMod->zName)==0 ) break;
+    }
+  }
+
+  return pMod;
+}
+
+/*
+** Find a tokenizer. This is the implementation of the 
+** fts5_api.xFindTokenizer() method.
+*/
+static int fts5FindTokenizer(
+  fts5_api *pApi,                 /* Global context (one per db handle) */
+  const char *zName,              /* Name of new function */
+  void **ppUserData,
+  fts5_tokenizer *pTokenizer      /* Populate this object */
+){
+  int rc = SQLITE_OK;
+  Fts5TokenizerModule *pMod;
+
+  pMod = fts5LocateTokenizer((Fts5Global*)pApi, zName);
+  if( pMod ){
+    *pTokenizer = pMod->x;
+    *ppUserData = pMod->pUserData;
+  }else{
+    memset(pTokenizer, 0, sizeof(fts5_tokenizer));
+    rc = SQLITE_ERROR;
+  }
+
+  return rc;
+}
+
+static int sqlite3Fts5GetTokenizer(
+  Fts5Global *pGlobal, 
+  const char **azArg,
+  int nArg,
+  Fts5Config *pConfig,
+  char **pzErr
+){
+  Fts5TokenizerModule *pMod;
+  int rc = SQLITE_OK;
+
+  pMod = fts5LocateTokenizer(pGlobal, nArg==0 ? 0 : azArg[0]);
+  if( pMod==0 ){
+    assert( nArg>0 );
+    rc = SQLITE_ERROR;
+    *pzErr = sqlite3_mprintf("no such tokenizer: %s", azArg[0]);
+  }else{
+    rc = pMod->x.xCreate(
+        pMod->pUserData, (azArg?&azArg[1]:0), (nArg?nArg-1:0), &pConfig->pTok
+    );
+    pConfig->pTokApi = &pMod->x;
+    if( rc!=SQLITE_OK ){
+      if( pzErr ) *pzErr = sqlite3_mprintf("error in tokenizer constructor");
+    }else{
+      pConfig->ePattern = sqlite3Fts5TokenizerPattern(
+          pMod->x.xCreate, pConfig->pTok
+      );
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    pConfig->pTokApi = 0;
+    pConfig->pTok = 0;
+  }
+
+  return rc;
+}
+
+static void fts5ModuleDestroy(void *pCtx){
+  Fts5TokenizerModule *pTok, *pNextTok;
+  Fts5Auxiliary *pAux, *pNextAux;
+  Fts5Global *pGlobal = (Fts5Global*)pCtx;
+
+  for(pAux=pGlobal->pAux; pAux; pAux=pNextAux){
+    pNextAux = pAux->pNext;
+    if( pAux->xDestroy ) pAux->xDestroy(pAux->pUserData);
+    sqlite3_free(pAux);
+  }
+
+  for(pTok=pGlobal->pTok; pTok; pTok=pNextTok){
+    pNextTok = pTok->pNext;
+    if( pTok->xDestroy ) pTok->xDestroy(pTok->pUserData);
+    sqlite3_free(pTok);
+  }
+
+  sqlite3_free(pGlobal);
+}
+
+static void fts5Fts5Func(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apArg           /* Function arguments */
+){
+  Fts5Global *pGlobal = (Fts5Global*)sqlite3_user_data(pCtx);
+  fts5_api **ppApi;
+  UNUSED_PARAM(nArg);
+  assert( nArg==1 );
+  ppApi = (fts5_api**)sqlite3_value_pointer(apArg[0], "fts5_api_ptr");
+  if( ppApi ) *ppApi = &pGlobal->api;
+}
+
+/*
+** Implementation of fts5_source_id() function.
+*/
+static void fts5SourceIdFunc(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apUnused        /* Function arguments */
+){
+  assert( nArg==0 );
+  UNUSED_PARAM2(nArg, apUnused);
+  sqlite3_result_text(pCtx, "fts5: 2024-01-30 16:01:20 e876e51a0ed5c5b3126f52e532044363a014bc594cfefa87ffb5b82257cc467a", -1, SQLITE_TRANSIENT);
+}
+
+/*
+** Return true if zName is the extension on one of the shadow tables used
+** by this module.
+*/
+static int fts5ShadowName(const char *zName){
+  static const char *azName[] = {
+    "config", "content", "data", "docsize", "idx"
+  };
+  unsigned int i;
+  for(i=0; i<sizeof(azName)/sizeof(azName[0]); i++){
+    if( sqlite3_stricmp(zName, azName[i])==0 ) return 1;
+  }
+  return 0;
+}
+
+/*
+** Run an integrity check on the FTS5 data structures.  Return a string
+** if anything is found amiss.  Return a NULL pointer if everything is
+** OK.
+*/
+static int fts5IntegrityMethod(
+  sqlite3_vtab *pVtab,    /* the FTS5 virtual table to check */
+  const char *zSchema,    /* Name of schema in which this table lives */
+  const char *zTabname,   /* Name of the table itself */
+  int isQuick,            /* True if this is a quick-check */
+  char **pzErr            /* Write error message here */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  int rc;
+
+  assert( pzErr!=0 && *pzErr==0 );
+  UNUSED_PARAM(isQuick);
+  rc = sqlite3Fts5StorageIntegrity(pTab->pStorage, 0);
+  if( (rc&0xff)==SQLITE_CORRUPT ){
+    *pzErr = sqlite3_mprintf("malformed inverted index for FTS5 table %s.%s",
+                zSchema, zTabname);
+  }else if( rc!=SQLITE_OK ){
+    *pzErr = sqlite3_mprintf("unable to validate the inverted index for"
+                             " FTS5 table %s.%s: %s",
+                zSchema, zTabname, sqlite3_errstr(rc));
+  }
+  sqlite3Fts5IndexCloseReader(pTab->p.pIndex);
+
+  return SQLITE_OK;
+}
+
+static int fts5Init(sqlite3 *db){
+  static const sqlite3_module fts5Mod = {
+    /* iVersion      */ 4,
+    /* xCreate       */ fts5CreateMethod,
+    /* xConnect      */ fts5ConnectMethod,
+    /* xBestIndex    */ fts5BestIndexMethod,
+    /* xDisconnect   */ fts5DisconnectMethod,
+    /* xDestroy      */ fts5DestroyMethod,
+    /* xOpen         */ fts5OpenMethod,
+    /* xClose        */ fts5CloseMethod,
+    /* xFilter       */ fts5FilterMethod,
+    /* xNext         */ fts5NextMethod,
+    /* xEof          */ fts5EofMethod,
+    /* xColumn       */ fts5ColumnMethod,
+    /* xRowid        */ fts5RowidMethod,
+    /* xUpdate       */ fts5UpdateMethod,
+    /* xBegin        */ fts5BeginMethod,
+    /* xSync         */ fts5SyncMethod,
+    /* xCommit       */ fts5CommitMethod,
+    /* xRollback     */ fts5RollbackMethod,
+    /* xFindFunction */ fts5FindFunctionMethod,
+    /* xRename       */ fts5RenameMethod,
+    /* xSavepoint    */ fts5SavepointMethod,
+    /* xRelease      */ fts5ReleaseMethod,
+    /* xRollbackTo   */ fts5RollbackToMethod,
+    /* xShadowName   */ fts5ShadowName,
+    /* xIntegrity    */ fts5IntegrityMethod
+  };
+
+  int rc;
+  Fts5Global *pGlobal = 0;
+
+  pGlobal = (Fts5Global*)sqlite3_malloc(sizeof(Fts5Global));
+  if( pGlobal==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    void *p = (void*)pGlobal;
+    memset(pGlobal, 0, sizeof(Fts5Global));
+    pGlobal->db = db;
+    pGlobal->api.iVersion = 2;
+    pGlobal->api.xCreateFunction = fts5CreateAux;
+    pGlobal->api.xCreateTokenizer = fts5CreateTokenizer;
+    pGlobal->api.xFindTokenizer = fts5FindTokenizer;
+    rc = sqlite3_create_module_v2(db, "fts5", &fts5Mod, p, fts5ModuleDestroy);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5IndexInit(db);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5ExprInit(pGlobal, db);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5AuxInit(&pGlobal->api);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5TokenizerInit(&pGlobal->api);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5VocabInit(pGlobal, db);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_create_function(
+          db, "fts5", 1, SQLITE_UTF8, p, fts5Fts5Func, 0, 0
+      );
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_create_function(
+          db, "fts5_source_id", 0, 
+          SQLITE_UTF8|SQLITE_DETERMINISTIC|SQLITE_INNOCUOUS,
+          p, fts5SourceIdFunc, 0, 0
+      );
+    }
+  }
+
+  /* If SQLITE_FTS5_ENABLE_TEST_MI is defined, assume that the file
+  ** fts5_test_mi.c is compiled and linked into the executable. And call
+  ** its entry point to enable the matchinfo() demo.  */
+#ifdef SQLITE_FTS5_ENABLE_TEST_MI
+  if( rc==SQLITE_OK ){
+    extern int sqlite3Fts5TestRegisterMatchinfo(sqlite3*);
+    rc = sqlite3Fts5TestRegisterMatchinfo(db);
+  }
+#endif
+
+  return rc;
+}
+
+/*
+** The following functions are used to register the module with SQLite. If
+** this module is being built as part of the SQLite core (SQLITE_CORE is
+** defined), then sqlite3_open() will call sqlite3Fts5Init() directly.
+**
+** Or, if this module is being built as a loadable extension, 
+** sqlite3Fts5Init() is omitted and the two standard entry points
+** sqlite3_fts_init() and sqlite3_fts5_init() defined instead.
+*/
+#ifndef SQLITE_CORE
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int sqlite3_fts_init(
+  sqlite3 *db,
+  char **pzErrMsg,
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return fts5Init(db);
+}
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int sqlite3_fts5_init(
+  sqlite3 *db,
+  char **pzErrMsg,
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return fts5Init(db);
+}
+#else
+int sqlite3Fts5Init(sqlite3 *db){
+  return fts5Init(db);
+}
+#endif
+
+#line 1 "fts5_storage.c"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+
+
+
+/* #include "fts5Int.h" */
+
+struct Fts5Storage {
+  Fts5Config *pConfig;
+  Fts5Index *pIndex;
+  int bTotalsValid;               /* True if nTotalRow/aTotalSize[] are valid */
+  i64 nTotalRow;                  /* Total number of rows in FTS table */
+  i64 *aTotalSize;                /* Total sizes of each column */ 
+  sqlite3_stmt *aStmt[11];
+};
+
+
+#if FTS5_STMT_SCAN_ASC!=0 
+# error "FTS5_STMT_SCAN_ASC mismatch" 
+#endif
+#if FTS5_STMT_SCAN_DESC!=1 
+# error "FTS5_STMT_SCAN_DESC mismatch" 
+#endif
+#if FTS5_STMT_LOOKUP!=2
+# error "FTS5_STMT_LOOKUP mismatch" 
+#endif
+
+#define FTS5_STMT_INSERT_CONTENT  3
+#define FTS5_STMT_REPLACE_CONTENT 4
+#define FTS5_STMT_DELETE_CONTENT  5
+#define FTS5_STMT_REPLACE_DOCSIZE  6
+#define FTS5_STMT_DELETE_DOCSIZE  7
+#define FTS5_STMT_LOOKUP_DOCSIZE  8
+#define FTS5_STMT_REPLACE_CONFIG 9
+#define FTS5_STMT_SCAN 10
+
+/*
+** Prepare the two insert statements - Fts5Storage.pInsertContent and
+** Fts5Storage.pInsertDocsize - if they have not already been prepared.
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5StorageGetStmt(
+  Fts5Storage *p,                 /* Storage handle */
+  int eStmt,                      /* FTS5_STMT_XXX constant */
+  sqlite3_stmt **ppStmt,          /* OUT: Prepared statement handle */
+  char **pzErrMsg                 /* OUT: Error message (if any) */
+){
+  int rc = SQLITE_OK;
+
+  /* If there is no %_docsize table, there should be no requests for 
+  ** statements to operate on it.  */
+  assert( p->pConfig->bColumnsize || (
+        eStmt!=FTS5_STMT_REPLACE_DOCSIZE 
+     && eStmt!=FTS5_STMT_DELETE_DOCSIZE 
+     && eStmt!=FTS5_STMT_LOOKUP_DOCSIZE 
+  ));
+
+  assert( eStmt>=0 && eStmt<ArraySize(p->aStmt) );
+  if( p->aStmt[eStmt]==0 ){
+    const char *azStmt[] = {
+      "SELECT %s FROM %s T WHERE T.%Q >= ? AND T.%Q <= ? ORDER BY T.%Q ASC",
+      "SELECT %s FROM %s T WHERE T.%Q <= ? AND T.%Q >= ? ORDER BY T.%Q DESC",
+      "SELECT %s FROM %s T WHERE T.%Q=?",               /* LOOKUP  */
+
+      "INSERT INTO %Q.'%q_content' VALUES(%s)",         /* INSERT_CONTENT  */
+      "REPLACE INTO %Q.'%q_content' VALUES(%s)",        /* REPLACE_CONTENT */
+      "DELETE FROM %Q.'%q_content' WHERE id=?",         /* DELETE_CONTENT  */
+      "REPLACE INTO %Q.'%q_docsize' VALUES(?,?%s)",     /* REPLACE_DOCSIZE  */
+      "DELETE FROM %Q.'%q_docsize' WHERE id=?",         /* DELETE_DOCSIZE  */
+
+      "SELECT sz%s FROM %Q.'%q_docsize' WHERE id=?",    /* LOOKUP_DOCSIZE  */
+
+      "REPLACE INTO %Q.'%q_config' VALUES(?,?)",        /* REPLACE_CONFIG */
+      "SELECT %s FROM %s AS T",                         /* SCAN */
+    };
+    Fts5Config *pC = p->pConfig;
+    char *zSql = 0;
+
+    switch( eStmt ){
+      case FTS5_STMT_SCAN:
+        zSql = sqlite3_mprintf(azStmt[eStmt], 
+            pC->zContentExprlist, pC->zContent
+        );
+        break;
+
+      case FTS5_STMT_SCAN_ASC:
+      case FTS5_STMT_SCAN_DESC:
+        zSql = sqlite3_mprintf(azStmt[eStmt], pC->zContentExprlist, 
+            pC->zContent, pC->zContentRowid, pC->zContentRowid,
+            pC->zContentRowid
+        );
+        break;
+
+      case FTS5_STMT_LOOKUP:
+        zSql = sqlite3_mprintf(azStmt[eStmt], 
+            pC->zContentExprlist, pC->zContent, pC->zContentRowid
+        );
+        break;
+
+      case FTS5_STMT_INSERT_CONTENT: 
+      case FTS5_STMT_REPLACE_CONTENT: {
+        int nCol = pC->nCol + 1;
+        char *zBind;
+        int i;
+
+        zBind = sqlite3_malloc64(1 + nCol*2);
+        if( zBind ){
+          for(i=0; i<nCol; i++){
+            zBind[i*2] = '?';
+            zBind[i*2 + 1] = ',';
+          }
+          zBind[i*2-1] = '\0';
+          zSql = sqlite3_mprintf(azStmt[eStmt], pC->zDb, pC->zName, zBind);
+          sqlite3_free(zBind);
+        }
+        break;
+      }
+
+      case FTS5_STMT_REPLACE_DOCSIZE: 
+        zSql = sqlite3_mprintf(azStmt[eStmt], pC->zDb, pC->zName,
+          (pC->bContentlessDelete ? ",?" : "")
+        );
+        break;
+
+      case FTS5_STMT_LOOKUP_DOCSIZE: 
+        zSql = sqlite3_mprintf(azStmt[eStmt], 
+            (pC->bContentlessDelete ? ",origin" : ""),
+            pC->zDb, pC->zName
+        );
+        break;
+
+      default:
+        zSql = sqlite3_mprintf(azStmt[eStmt], pC->zDb, pC->zName);
+        break;
+    }
+
+    if( zSql==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      int f = SQLITE_PREPARE_PERSISTENT;
+      if( eStmt>FTS5_STMT_LOOKUP ) f |= SQLITE_PREPARE_NO_VTAB;
+      p->pConfig->bLock++;
+      rc = sqlite3_prepare_v3(pC->db, zSql, -1, f, &p->aStmt[eStmt], 0);
+      p->pConfig->bLock--;
+      sqlite3_free(zSql);
+      if( rc!=SQLITE_OK && pzErrMsg ){
+        *pzErrMsg = sqlite3_mprintf("%s", sqlite3_errmsg(pC->db));
+      }
+    }
+  }
+
+  *ppStmt = p->aStmt[eStmt];
+  sqlite3_reset(*ppStmt);
+  return rc;
+}
+
+
+static int fts5ExecPrintf(
+  sqlite3 *db,
+  char **pzErr,
+  const char *zFormat,
+  ...
+){
+  int rc;
+  va_list ap;                     /* ... printf arguments */
+  char *zSql;
+
+  va_start(ap, zFormat);
+  zSql = sqlite3_vmprintf(zFormat, ap);
+
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    rc = sqlite3_exec(db, zSql, 0, 0, pzErr);
+    sqlite3_free(zSql);
+  }
+
+  va_end(ap);
+  return rc;
+}
+
+/*
+** Drop all shadow tables. Return SQLITE_OK if successful or an SQLite error
+** code otherwise.
+*/
+static int sqlite3Fts5DropAll(Fts5Config *pConfig){
+  int rc = fts5ExecPrintf(pConfig->db, 0, 
+      "DROP TABLE IF EXISTS %Q.'%q_data';"
+      "DROP TABLE IF EXISTS %Q.'%q_idx';"
+      "DROP TABLE IF EXISTS %Q.'%q_config';",
+      pConfig->zDb, pConfig->zName,
+      pConfig->zDb, pConfig->zName,
+      pConfig->zDb, pConfig->zName
+  );
+  if( rc==SQLITE_OK && pConfig->bColumnsize ){
+    rc = fts5ExecPrintf(pConfig->db, 0, 
+        "DROP TABLE IF EXISTS %Q.'%q_docsize';",
+        pConfig->zDb, pConfig->zName
+    );
+  }
+  if( rc==SQLITE_OK && pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    rc = fts5ExecPrintf(pConfig->db, 0, 
+        "DROP TABLE IF EXISTS %Q.'%q_content';",
+        pConfig->zDb, pConfig->zName
+    );
+  }
+  return rc;
+}
+
+static void fts5StorageRenameOne(
+  Fts5Config *pConfig,            /* Current FTS5 configuration */
+  int *pRc,                       /* IN/OUT: Error code */
+  const char *zTail,              /* Tail of table name e.g. "data", "config" */
+  const char *zName               /* New name of FTS5 table */
+){
+  if( *pRc==SQLITE_OK ){
+    *pRc = fts5ExecPrintf(pConfig->db, 0, 
+        "ALTER TABLE %Q.'%q_%s' RENAME TO '%q_%s';",
+        pConfig->zDb, pConfig->zName, zTail, zName, zTail
+    );
+  }
+}
+
+static int sqlite3Fts5StorageRename(Fts5Storage *pStorage, const char *zName){
+  Fts5Config *pConfig = pStorage->pConfig;
+  int rc = sqlite3Fts5StorageSync(pStorage);
+
+  fts5StorageRenameOne(pConfig, &rc, "data", zName);
+  fts5StorageRenameOne(pConfig, &rc, "idx", zName);
+  fts5StorageRenameOne(pConfig, &rc, "config", zName);
+  if( pConfig->bColumnsize ){
+    fts5StorageRenameOne(pConfig, &rc, "docsize", zName);
+  }
+  if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    fts5StorageRenameOne(pConfig, &rc, "content", zName);
+  }
+  return rc;
+}
+
+/*
+** Create the shadow table named zPost, with definition zDefn. Return
+** SQLITE_OK if successful, or an SQLite error code otherwise.
+*/
+static int sqlite3Fts5CreateTable(
+  Fts5Config *pConfig,            /* FTS5 configuration */
+  const char *zPost,              /* Shadow table to create (e.g. "content") */
+  const char *zDefn,              /* Columns etc. for shadow table */
+  int bWithout,                   /* True for without rowid */
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc;
+  char *zErr = 0;
+
+  rc = fts5ExecPrintf(pConfig->db, &zErr, "CREATE TABLE %Q.'%q_%q'(%s)%s",
+      pConfig->zDb, pConfig->zName, zPost, zDefn, 
+#ifndef SQLITE_FTS5_NO_WITHOUT_ROWID
+      bWithout?" WITHOUT ROWID":
+#endif
+      ""
+  );
+  if( zErr ){
+    *pzErr = sqlite3_mprintf(
+        "fts5: error creating shadow table %q_%s: %s", 
+        pConfig->zName, zPost, zErr
+    );
+    sqlite3_free(zErr);
+  }
+
+  return rc;
+}
+
+/*
+** Open a new Fts5Index handle. If the bCreate argument is true, create
+** and initialize the underlying tables 
+**
+** If successful, set *pp to point to the new object and return SQLITE_OK.
+** Otherwise, set *pp to NULL and return an SQLite error code.
+*/
+static int sqlite3Fts5StorageOpen(
+  Fts5Config *pConfig, 
+  Fts5Index *pIndex, 
+  int bCreate, 
+  Fts5Storage **pp,
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc = SQLITE_OK;
+  Fts5Storage *p;                 /* New object */
+  sqlite3_int64 nByte;            /* Bytes of space to allocate */
+
+  nByte = sizeof(Fts5Storage)               /* Fts5Storage object */
+        + pConfig->nCol * sizeof(i64);      /* Fts5Storage.aTotalSize[] */
+  *pp = p = (Fts5Storage*)sqlite3_malloc64(nByte);
+  if( !p ) return SQLITE_NOMEM;
+
+  memset(p, 0, (size_t)nByte);
+  p->aTotalSize = (i64*)&p[1];
+  p->pConfig = pConfig;
+  p->pIndex = pIndex;
+
+  if( bCreate ){
+    if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+      int nDefn = 32 + pConfig->nCol*10;
+      char *zDefn = sqlite3_malloc64(32 + (sqlite3_int64)pConfig->nCol * 10);
+      if( zDefn==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        int i;
+        int iOff;
+        sqlite3_snprintf(nDefn, zDefn, "id INTEGER PRIMARY KEY");
+        iOff = (int)strlen(zDefn);
+        for(i=0; i<pConfig->nCol; i++){
+          sqlite3_snprintf(nDefn-iOff, &zDefn[iOff], ", c%d", i);
+          iOff += (int)strlen(&zDefn[iOff]);
+        }
+        rc = sqlite3Fts5CreateTable(pConfig, "content", zDefn, 0, pzErr);
+      }
+      sqlite3_free(zDefn);
+    }
+
+    if( rc==SQLITE_OK && pConfig->bColumnsize ){
+      const char *zCols = "id INTEGER PRIMARY KEY, sz BLOB";
+      if( pConfig->bContentlessDelete ){
+        zCols = "id INTEGER PRIMARY KEY, sz BLOB, origin INTEGER";
+      }
+      rc = sqlite3Fts5CreateTable(pConfig, "docsize", zCols, 0, pzErr);
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5CreateTable(
+          pConfig, "config", "k PRIMARY KEY, v", 1, pzErr
+      );
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5StorageConfigValue(p, "version", 0, FTS5_CURRENT_VERSION);
+    }
+  }
+
+  if( rc ){
+    sqlite3Fts5StorageClose(p);
+    *pp = 0;
+  }
+  return rc;
+}
+
+/*
+** Close a handle opened by an earlier call to sqlite3Fts5StorageOpen().
+*/
+static int sqlite3Fts5StorageClose(Fts5Storage *p){
+  int rc = SQLITE_OK;
+  if( p ){
+    int i;
+
+    /* Finalize all SQL statements */
+    for(i=0; i<ArraySize(p->aStmt); i++){
+      sqlite3_finalize(p->aStmt[i]);
+    }
+
+    sqlite3_free(p);
+  }
+  return rc;
+}
+
+typedef struct Fts5InsertCtx Fts5InsertCtx;
+struct Fts5InsertCtx {
+  Fts5Storage *pStorage;
+  int iCol;
+  int szCol;                      /* Size of column value in tokens */
+};
+
+/*
+** Tokenization callback used when inserting tokens into the FTS index.
+*/
+static int fts5StorageInsertCallback(
+  void *pContext,                 /* Pointer to Fts5InsertCtx object */
+  int tflags,
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  Fts5InsertCtx *pCtx = (Fts5InsertCtx*)pContext;
+  Fts5Index *pIdx = pCtx->pStorage->pIndex;
+  UNUSED_PARAM2(iUnused1, iUnused2);
+  if( nToken>FTS5_MAX_TOKEN_SIZE ) nToken = FTS5_MAX_TOKEN_SIZE;
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 || pCtx->szCol==0 ){
+    pCtx->szCol++;
+  }
+  return sqlite3Fts5IndexWrite(pIdx, pCtx->iCol, pCtx->szCol-1, pToken, nToken);
+}
+
+/*
+** If a row with rowid iDel is present in the %_content table, add the
+** delete-markers to the FTS index necessary to delete it. Do not actually
+** remove the %_content row at this time though.
+*/
+static int fts5StorageDeleteFromIndex(
+  Fts5Storage *p, 
+  i64 iDel, 
+  sqlite3_value **apVal
+){
+  Fts5Config *pConfig = p->pConfig;
+  sqlite3_stmt *pSeek = 0;        /* SELECT to read row iDel from %_data */
+  int rc = SQLITE_OK;             /* Return code */
+  int rc2;                        /* sqlite3_reset() return code */
+  int iCol;
+  Fts5InsertCtx ctx;
+
+  if( apVal==0 ){
+    rc = fts5StorageGetStmt(p, FTS5_STMT_LOOKUP, &pSeek, 0);
+    if( rc!=SQLITE_OK ) return rc;
+    sqlite3_bind_int64(pSeek, 1, iDel);
+    if( sqlite3_step(pSeek)!=SQLITE_ROW ){
+      return sqlite3_reset(pSeek);
+    }
+  }
+
+  ctx.pStorage = p;
+  ctx.iCol = -1;
+  for(iCol=1; rc==SQLITE_OK && iCol<=pConfig->nCol; iCol++){
+    if( pConfig->abUnindexed[iCol-1]==0 ){
+      const char *zText;
+      int nText;
+      assert( pSeek==0 || apVal==0 );
+      assert( pSeek!=0 || apVal!=0 );
+      if( pSeek ){
+        zText = (const char*)sqlite3_column_text(pSeek, iCol);
+        nText = sqlite3_column_bytes(pSeek, iCol);
+      }else if( ALWAYS(apVal) ){
+        zText = (const char*)sqlite3_value_text(apVal[iCol-1]);
+        nText = sqlite3_value_bytes(apVal[iCol-1]);
+      }else{
+        continue;
+      }
+      ctx.szCol = 0;
+      rc = sqlite3Fts5Tokenize(pConfig, FTS5_TOKENIZE_DOCUMENT, 
+          zText, nText, (void*)&ctx, fts5StorageInsertCallback
+      );
+      p->aTotalSize[iCol-1] -= (i64)ctx.szCol;
+      if( p->aTotalSize[iCol-1]<0 ){
+        rc = FTS5_CORRUPT;
+      }
+    }
+  }
+  if( rc==SQLITE_OK && p->nTotalRow<1 ){
+    rc = FTS5_CORRUPT;
+  }else{
+    p->nTotalRow--;
+  }
+
+  rc2 = sqlite3_reset(pSeek);
+  if( rc==SQLITE_OK ) rc = rc2;
+  return rc;
+}
+
+/*
+** This function is called to process a DELETE on a contentless_delete=1
+** table. It adds the tombstone required to delete the entry with rowid 
+** iDel. If successful, SQLITE_OK is returned. Or, if an error occurs,
+** an SQLite error code.
+*/
+static int fts5StorageContentlessDelete(Fts5Storage *p, i64 iDel){
+  i64 iOrigin = 0;
+  sqlite3_stmt *pLookup = 0;
+  int rc = SQLITE_OK;
+
+  assert( p->pConfig->bContentlessDelete );
+  assert( p->pConfig->eContent==FTS5_CONTENT_NONE );
+
+  /* Look up the origin of the document in the %_docsize table. Store
+  ** this in stack variable iOrigin.  */
+  rc = fts5StorageGetStmt(p, FTS5_STMT_LOOKUP_DOCSIZE, &pLookup, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pLookup, 1, iDel);
+    if( SQLITE_ROW==sqlite3_step(pLookup) ){
+      iOrigin = sqlite3_column_int64(pLookup, 1);
+    }
+    rc = sqlite3_reset(pLookup);
+  }
+
+  if( rc==SQLITE_OK && iOrigin!=0 ){
+    rc = sqlite3Fts5IndexContentlessDelete(p->pIndex, iOrigin, iDel);
+  }
+
+  return rc;
+}
+
+/*
+** Insert a record into the %_docsize table. Specifically, do:
+**
+**   INSERT OR REPLACE INTO %_docsize(id, sz) VALUES(iRowid, pBuf);
+**
+** If there is no %_docsize table (as happens if the columnsize=0 option
+** is specified when the FTS5 table is created), this function is a no-op.
+*/
+static int fts5StorageInsertDocsize(
+  Fts5Storage *p,                 /* Storage module to write to */
+  i64 iRowid,                     /* id value */
+  Fts5Buffer *pBuf                /* sz value */
+){
+  int rc = SQLITE_OK;
+  if( p->pConfig->bColumnsize ){
+    sqlite3_stmt *pReplace = 0;
+    rc = fts5StorageGetStmt(p, FTS5_STMT_REPLACE_DOCSIZE, &pReplace, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pReplace, 1, iRowid);
+      if( p->pConfig->bContentlessDelete ){
+        i64 iOrigin = 0;
+        rc = sqlite3Fts5IndexGetOrigin(p->pIndex, &iOrigin);
+        sqlite3_bind_int64(pReplace, 3, iOrigin);
+      }
+      if( rc==SQLITE_OK ){
+        sqlite3_bind_blob(pReplace, 2, pBuf->p, pBuf->n, SQLITE_STATIC);
+        sqlite3_step(pReplace);
+        rc = sqlite3_reset(pReplace);
+        sqlite3_bind_null(pReplace, 2);
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** Load the contents of the "averages" record from disk into the 
+** p->nTotalRow and p->aTotalSize[] variables. If successful, and if
+** argument bCache is true, set the p->bTotalsValid flag to indicate
+** that the contents of aTotalSize[] and nTotalRow are valid until
+** further notice.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5StorageLoadTotals(Fts5Storage *p, int bCache){
+  int rc = SQLITE_OK;
+  if( p->bTotalsValid==0 ){
+    rc = sqlite3Fts5IndexGetAverages(p->pIndex, &p->nTotalRow, p->aTotalSize);
+    p->bTotalsValid = bCache;
+  }
+  return rc;
+}
+
+/*
+** Store the current contents of the p->nTotalRow and p->aTotalSize[] 
+** variables in the "averages" record on disk.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5StorageSaveTotals(Fts5Storage *p){
+  int nCol = p->pConfig->nCol;
+  int i;
+  Fts5Buffer buf;
+  int rc = SQLITE_OK;
+  memset(&buf, 0, sizeof(buf));
+
+  sqlite3Fts5BufferAppendVarint(&rc, &buf, p->nTotalRow);
+  for(i=0; i<nCol; i++){
+    sqlite3Fts5BufferAppendVarint(&rc, &buf, p->aTotalSize[i]);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexSetAverages(p->pIndex, buf.p, buf.n);
+  }
+  sqlite3_free(buf.p);
+
+  return rc;
+}
+
+/*
+** Remove a row from the FTS table.
+*/
+static int sqlite3Fts5StorageDelete(Fts5Storage *p, i64 iDel, sqlite3_value **apVal){
+  Fts5Config *pConfig = p->pConfig;
+  int rc;
+  sqlite3_stmt *pDel = 0;
+
+  assert( pConfig->eContent!=FTS5_CONTENT_NORMAL || apVal==0 );
+  rc = fts5StorageLoadTotals(p, 1);
+
+  /* Delete the index records */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 1, iDel);
+  }
+
+  if( rc==SQLITE_OK ){
+    if( p->pConfig->bContentlessDelete ){
+      rc = fts5StorageContentlessDelete(p, iDel);
+    }else{
+      rc = fts5StorageDeleteFromIndex(p, iDel, apVal);
+    }
+  }
+
+  /* Delete the %_docsize record */
+  if( rc==SQLITE_OK && pConfig->bColumnsize ){
+    rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_DOCSIZE, &pDel, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pDel, 1, iDel);
+      sqlite3_step(pDel);
+      rc = sqlite3_reset(pDel);
+    }
+  }
+
+  /* Delete the %_content record */
+  if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    if( rc==SQLITE_OK ){
+      rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_CONTENT, &pDel, 0);
+    }
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pDel, 1, iDel);
+      sqlite3_step(pDel);
+      rc = sqlite3_reset(pDel);
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Delete all entries in the FTS5 index.
+*/
+static int sqlite3Fts5StorageDeleteAll(Fts5Storage *p){
+  Fts5Config *pConfig = p->pConfig;
+  int rc;
+
+  p->bTotalsValid = 0;
+
+  /* Delete the contents of the %_data and %_docsize tables. */
+  rc = fts5ExecPrintf(pConfig->db, 0,
+      "DELETE FROM %Q.'%q_data';" 
+      "DELETE FROM %Q.'%q_idx';",
+      pConfig->zDb, pConfig->zName,
+      pConfig->zDb, pConfig->zName
+  );
+  if( rc==SQLITE_OK && pConfig->bColumnsize ){
+    rc = fts5ExecPrintf(pConfig->db, 0,
+        "DELETE FROM %Q.'%q_docsize';",
+        pConfig->zDb, pConfig->zName
+    );
+  }
+
+  /* Reinitialize the %_data table. This call creates the initial structure
+  ** and averages records.  */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexReinit(p->pIndex);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageConfigValue(p, "version", 0, FTS5_CURRENT_VERSION);
+  }
+  return rc;
+}
+
+static int sqlite3Fts5StorageRebuild(Fts5Storage *p){
+  Fts5Buffer buf = {0,0,0};
+  Fts5Config *pConfig = p->pConfig;
+  sqlite3_stmt *pScan = 0;
+  Fts5InsertCtx ctx;
+  int rc, rc2;
+
+  memset(&ctx, 0, sizeof(Fts5InsertCtx));
+  ctx.pStorage = p;
+  rc = sqlite3Fts5StorageDeleteAll(p);
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageLoadTotals(p, 1);
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageGetStmt(p, FTS5_STMT_SCAN, &pScan, pConfig->pzErrmsg);
+  }
+
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pScan) ){
+    i64 iRowid = sqlite3_column_int64(pScan, 0);
+
+    sqlite3Fts5BufferZero(&buf);
+    rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 0, iRowid);
+    for(ctx.iCol=0; rc==SQLITE_OK && ctx.iCol<pConfig->nCol; ctx.iCol++){
+      ctx.szCol = 0;
+      if( pConfig->abUnindexed[ctx.iCol]==0 ){
+        const char *zText = (const char*)sqlite3_column_text(pScan, ctx.iCol+1);
+        int nText = sqlite3_column_bytes(pScan, ctx.iCol+1);
+        rc = sqlite3Fts5Tokenize(pConfig, 
+            FTS5_TOKENIZE_DOCUMENT,
+            zText, nText,
+            (void*)&ctx,
+            fts5StorageInsertCallback
+        );
+      }
+      sqlite3Fts5BufferAppendVarint(&rc, &buf, ctx.szCol);
+      p->aTotalSize[ctx.iCol] += (i64)ctx.szCol;
+    }
+    p->nTotalRow++;
+
+    if( rc==SQLITE_OK ){
+      rc = fts5StorageInsertDocsize(p, iRowid, &buf);
+    }
+  }
+  sqlite3_free(buf.p);
+  rc2 = sqlite3_reset(pScan);
+  if( rc==SQLITE_OK ) rc = rc2;
+
+  /* Write the averages record */
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageSaveTotals(p);
+  }
+  return rc;
+}
+
+static int sqlite3Fts5StorageOptimize(Fts5Storage *p){
+  return sqlite3Fts5IndexOptimize(p->pIndex);
+}
+
+static int sqlite3Fts5StorageMerge(Fts5Storage *p, int nMerge){
+  return sqlite3Fts5IndexMerge(p->pIndex, nMerge);
+}
+
+static int sqlite3Fts5StorageReset(Fts5Storage *p){
+  return sqlite3Fts5IndexReset(p->pIndex);
+}
+
+/*
+** Allocate a new rowid. This is used for "external content" tables when
+** a NULL value is inserted into the rowid column. The new rowid is allocated
+** by inserting a dummy row into the %_docsize table. The dummy will be
+** overwritten later.
+**
+** If the %_docsize table does not exist, SQLITE_MISMATCH is returned. In
+** this case the user is required to provide a rowid explicitly.
+*/
+static int fts5StorageNewRowid(Fts5Storage *p, i64 *piRowid){
+  int rc = SQLITE_MISMATCH;
+  if( p->pConfig->bColumnsize ){
+    sqlite3_stmt *pReplace = 0;
+    rc = fts5StorageGetStmt(p, FTS5_STMT_REPLACE_DOCSIZE, &pReplace, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_null(pReplace, 1);
+      sqlite3_bind_null(pReplace, 2);
+      sqlite3_step(pReplace);
+      rc = sqlite3_reset(pReplace);
+    }
+    if( rc==SQLITE_OK ){
+      *piRowid = sqlite3_last_insert_rowid(p->pConfig->db);
+    }
+  }
+  return rc;
+}
+
+/*
+** Insert a new row into the FTS content table.
+*/
+static int sqlite3Fts5StorageContentInsert(
+  Fts5Storage *p, 
+  sqlite3_value **apVal, 
+  i64 *piRowid
+){
+  Fts5Config *pConfig = p->pConfig;
+  int rc = SQLITE_OK;
+
+  /* Insert the new row into the %_content table. */
+  if( pConfig->eContent!=FTS5_CONTENT_NORMAL ){
+    if( sqlite3_value_type(apVal[1])==SQLITE_INTEGER ){
+      *piRowid = sqlite3_value_int64(apVal[1]);
+    }else{
+      rc = fts5StorageNewRowid(p, piRowid);
+    }
+  }else{
+    sqlite3_stmt *pInsert = 0;    /* Statement to write %_content table */
+    int i;                        /* Counter variable */
+    rc = fts5StorageGetStmt(p, FTS5_STMT_INSERT_CONTENT, &pInsert, 0);
+    for(i=1; rc==SQLITE_OK && i<=pConfig->nCol+1; i++){
+      rc = sqlite3_bind_value(pInsert, i, apVal[i]);
+    }
+    if( rc==SQLITE_OK ){
+      sqlite3_step(pInsert);
+      rc = sqlite3_reset(pInsert);
+    }
+    *piRowid = sqlite3_last_insert_rowid(pConfig->db);
+  }
+
+  return rc;
+}
+
+/*
+** Insert new entries into the FTS index and %_docsize table.
+*/
+static int sqlite3Fts5StorageIndexInsert(
+  Fts5Storage *p, 
+  sqlite3_value **apVal, 
+  i64 iRowid
+){
+  Fts5Config *pConfig = p->pConfig;
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5InsertCtx ctx;              /* Tokenization callback context object */
+  Fts5Buffer buf;                 /* Buffer used to build up %_docsize blob */
+
+  memset(&buf, 0, sizeof(Fts5Buffer));
+  ctx.pStorage = p;
+  rc = fts5StorageLoadTotals(p, 1);
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 0, iRowid);
+  }
+  for(ctx.iCol=0; rc==SQLITE_OK && ctx.iCol<pConfig->nCol; ctx.iCol++){
+    ctx.szCol = 0;
+    if( pConfig->abUnindexed[ctx.iCol]==0 ){
+      const char *zText = (const char*)sqlite3_value_text(apVal[ctx.iCol+2]);
+      int nText = sqlite3_value_bytes(apVal[ctx.iCol+2]);
+      rc = sqlite3Fts5Tokenize(pConfig, 
+          FTS5_TOKENIZE_DOCUMENT,
+          zText, nText,
+          (void*)&ctx,
+          fts5StorageInsertCallback
+      );
+    }
+    sqlite3Fts5BufferAppendVarint(&rc, &buf, ctx.szCol);
+    p->aTotalSize[ctx.iCol] += (i64)ctx.szCol;
+  }
+  p->nTotalRow++;
+
+  /* Write the %_docsize record */
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageInsertDocsize(p, iRowid, &buf);
+  }
+  sqlite3_free(buf.p);
+
+  return rc;
+}
+
+static int fts5StorageCount(Fts5Storage *p, const char *zSuffix, i64 *pnRow){
+  Fts5Config *pConfig = p->pConfig;
+  char *zSql;
+  int rc;
+
+  zSql = sqlite3_mprintf("SELECT count(*) FROM %Q.'%q_%s'", 
+      pConfig->zDb, pConfig->zName, zSuffix
+  );
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    sqlite3_stmt *pCnt = 0;
+    rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &pCnt, 0);
+    if( rc==SQLITE_OK ){
+      if( SQLITE_ROW==sqlite3_step(pCnt) ){
+        *pnRow = sqlite3_column_int64(pCnt, 0);
+      }
+      rc = sqlite3_finalize(pCnt);
+    }
+  }
+
+  sqlite3_free(zSql);
+  return rc;
+}
+
+/*
+** Context object used by sqlite3Fts5StorageIntegrity().
+*/
+typedef struct Fts5IntegrityCtx Fts5IntegrityCtx;
+struct Fts5IntegrityCtx {
+  i64 iRowid;
+  int iCol;
+  int szCol;
+  u64 cksum;
+  Fts5Termset *pTermset;
+  Fts5Config *pConfig;
+};
+
+
+/*
+** Tokenization callback used by integrity check.
+*/
+static int fts5StorageIntegrityCallback(
+  void *pContext,                 /* Pointer to Fts5IntegrityCtx object */
+  int tflags,
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  Fts5IntegrityCtx *pCtx = (Fts5IntegrityCtx*)pContext;
+  Fts5Termset *pTermset = pCtx->pTermset;
+  int bPresent;
+  int ii;
+  int rc = SQLITE_OK;
+  int iPos;
+  int iCol;
+
+  UNUSED_PARAM2(iUnused1, iUnused2);
+  if( nToken>FTS5_MAX_TOKEN_SIZE ) nToken = FTS5_MAX_TOKEN_SIZE;
+
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 || pCtx->szCol==0 ){
+    pCtx->szCol++;
+  }
+
+  switch( pCtx->pConfig->eDetail ){
+    case FTS5_DETAIL_FULL:
+      iPos = pCtx->szCol-1;
+      iCol = pCtx->iCol;
+      break;
+
+    case FTS5_DETAIL_COLUMNS:
+      iPos = pCtx->iCol;
+      iCol = 0;
+      break;
+
+    default:
+      assert( pCtx->pConfig->eDetail==FTS5_DETAIL_NONE );
+      iPos = 0;
+      iCol = 0;
+      break;
+  }
+
+  rc = sqlite3Fts5TermsetAdd(pTermset, 0, pToken, nToken, &bPresent);
+  if( rc==SQLITE_OK && bPresent==0 ){
+    pCtx->cksum ^= sqlite3Fts5IndexEntryCksum(
+        pCtx->iRowid, iCol, iPos, 0, pToken, nToken
+    );
+  }
+
+  for(ii=0; rc==SQLITE_OK && ii<pCtx->pConfig->nPrefix; ii++){
+    const int nChar = pCtx->pConfig->aPrefix[ii];
+    int nByte = sqlite3Fts5IndexCharlenToBytelen(pToken, nToken, nChar);
+    if( nByte ){
+      rc = sqlite3Fts5TermsetAdd(pTermset, ii+1, pToken, nByte, &bPresent);
+      if( bPresent==0 ){
+        pCtx->cksum ^= sqlite3Fts5IndexEntryCksum(
+            pCtx->iRowid, iCol, iPos, ii+1, pToken, nByte
+        );
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Check that the contents of the FTS index match that of the %_content
+** table. Return SQLITE_OK if they do, or SQLITE_CORRUPT if not. Return
+** some other SQLite error code if an error occurs while attempting to
+** determine this.
+*/
+static int sqlite3Fts5StorageIntegrity(Fts5Storage *p, int iArg){
+  Fts5Config *pConfig = p->pConfig;
+  int rc = SQLITE_OK;             /* Return code */
+  int *aColSize;                  /* Array of size pConfig->nCol */
+  i64 *aTotalSize;                /* Array of size pConfig->nCol */
+  Fts5IntegrityCtx ctx;
+  sqlite3_stmt *pScan;
+  int bUseCksum;
+
+  memset(&ctx, 0, sizeof(Fts5IntegrityCtx));
+  ctx.pConfig = p->pConfig;
+  aTotalSize = (i64*)sqlite3_malloc64(pConfig->nCol*(sizeof(int)+sizeof(i64)));
+  if( !aTotalSize ) return SQLITE_NOMEM;
+  aColSize = (int*)&aTotalSize[pConfig->nCol];
+  memset(aTotalSize, 0, sizeof(i64) * pConfig->nCol);
+
+  bUseCksum = (pConfig->eContent==FTS5_CONTENT_NORMAL
+           || (pConfig->eContent==FTS5_CONTENT_EXTERNAL && iArg)
+  );
+  if( bUseCksum ){
+    /* Generate the expected index checksum based on the contents of the
+    ** %_content table. This block stores the checksum in ctx.cksum. */
+    rc = fts5StorageGetStmt(p, FTS5_STMT_SCAN, &pScan, 0);
+    if( rc==SQLITE_OK ){
+      int rc2;
+      while( SQLITE_ROW==sqlite3_step(pScan) ){
+        int i;
+        ctx.iRowid = sqlite3_column_int64(pScan, 0);
+        ctx.szCol = 0;
+        if( pConfig->bColumnsize ){
+          rc = sqlite3Fts5StorageDocsize(p, ctx.iRowid, aColSize);
+        }
+        if( rc==SQLITE_OK && pConfig->eDetail==FTS5_DETAIL_NONE ){
+          rc = sqlite3Fts5TermsetNew(&ctx.pTermset);
+        }
+        for(i=0; rc==SQLITE_OK && i<pConfig->nCol; i++){
+          if( pConfig->abUnindexed[i] ) continue;
+          ctx.iCol = i;
+          ctx.szCol = 0;
+          if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+            rc = sqlite3Fts5TermsetNew(&ctx.pTermset);
+          }
+          if( rc==SQLITE_OK ){
+            const char *zText = (const char*)sqlite3_column_text(pScan, i+1);
+            int nText = sqlite3_column_bytes(pScan, i+1);
+            rc = sqlite3Fts5Tokenize(pConfig, 
+                FTS5_TOKENIZE_DOCUMENT,
+                zText, nText,
+                (void*)&ctx,
+                fts5StorageIntegrityCallback
+            );
+          }
+          if( rc==SQLITE_OK && pConfig->bColumnsize && ctx.szCol!=aColSize[i] ){
+            rc = FTS5_CORRUPT;
+          }
+          aTotalSize[i] += ctx.szCol;
+          if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+            sqlite3Fts5TermsetFree(ctx.pTermset);
+            ctx.pTermset = 0;
+          }
+        }
+        sqlite3Fts5TermsetFree(ctx.pTermset);
+        ctx.pTermset = 0;
+  
+        if( rc!=SQLITE_OK ) break;
+      }
+      rc2 = sqlite3_reset(pScan);
+      if( rc==SQLITE_OK ) rc = rc2;
+    }
+
+    /* Test that the "totals" (sometimes called "averages") record looks Ok */
+    if( rc==SQLITE_OK ){
+      int i;
+      rc = fts5StorageLoadTotals(p, 0);
+      for(i=0; rc==SQLITE_OK && i<pConfig->nCol; i++){
+        if( p->aTotalSize[i]!=aTotalSize[i] ) rc = FTS5_CORRUPT;
+      }
+    }
+
+    /* Check that the %_docsize and %_content tables contain the expected
+    ** number of rows.  */
+    if( rc==SQLITE_OK && pConfig->eContent==FTS5_CONTENT_NORMAL ){
+      i64 nRow = 0;
+      rc = fts5StorageCount(p, "content", &nRow);
+      if( rc==SQLITE_OK && nRow!=p->nTotalRow ) rc = FTS5_CORRUPT;
+    }
+    if( rc==SQLITE_OK && pConfig->bColumnsize ){
+      i64 nRow = 0;
+      rc = fts5StorageCount(p, "docsize", &nRow);
+      if( rc==SQLITE_OK && nRow!=p->nTotalRow ) rc = FTS5_CORRUPT;
+    }
+  }
+
+  /* Pass the expected checksum down to the FTS index module. It will
+  ** verify, amongst other things, that it matches the checksum generated by
+  ** inspecting the index itself.  */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexIntegrityCheck(p->pIndex, ctx.cksum, bUseCksum);
+  }
+
+  sqlite3_free(aTotalSize);
+  return rc;
+}
+
+/*
+** Obtain an SQLite statement handle that may be used to read data from the
+** %_content table.
+*/
+static int sqlite3Fts5StorageStmt(
+  Fts5Storage *p, 
+  int eStmt, 
+  sqlite3_stmt **pp, 
+  char **pzErrMsg
+){
+  int rc;
+  assert( eStmt==FTS5_STMT_SCAN_ASC 
+       || eStmt==FTS5_STMT_SCAN_DESC
+       || eStmt==FTS5_STMT_LOOKUP
+  );
+  rc = fts5StorageGetStmt(p, eStmt, pp, pzErrMsg);
+  if( rc==SQLITE_OK ){
+    assert( p->aStmt[eStmt]==*pp );
+    p->aStmt[eStmt] = 0;
+  }
+  return rc;
+}
+
+/*
+** Release an SQLite statement handle obtained via an earlier call to
+** sqlite3Fts5StorageStmt(). The eStmt parameter passed to this function
+** must match that passed to the sqlite3Fts5StorageStmt() call.
+*/
+static void sqlite3Fts5StorageStmtRelease(
+  Fts5Storage *p, 
+  int eStmt, 
+  sqlite3_stmt *pStmt
+){
+  assert( eStmt==FTS5_STMT_SCAN_ASC
+       || eStmt==FTS5_STMT_SCAN_DESC
+       || eStmt==FTS5_STMT_LOOKUP
+  );
+  if( p->aStmt[eStmt]==0 ){
+    sqlite3_reset(pStmt);
+    p->aStmt[eStmt] = pStmt;
+  }else{
+    sqlite3_finalize(pStmt);
+  }
+}
+
+static int fts5StorageDecodeSizeArray(
+  int *aCol, int nCol,            /* Array to populate */
+  const u8 *aBlob, int nBlob      /* Record to read varints from */
+){
+  int i;
+  int iOff = 0;
+  for(i=0; i<nCol; i++){
+    if( iOff>=nBlob ) return 1;
+    iOff += fts5GetVarint32(&aBlob[iOff], aCol[i]);
+  }
+  return (iOff!=nBlob);
+}
+
+/*
+** Argument aCol points to an array of integers containing one entry for
+** each table column. This function reads the %_docsize record for the
+** specified rowid and populates aCol[] with the results.
+**
+** An SQLite error code is returned if an error occurs, or SQLITE_OK
+** otherwise.
+*/
+static int sqlite3Fts5StorageDocsize(Fts5Storage *p, i64 iRowid, int *aCol){
+  int nCol = p->pConfig->nCol;    /* Number of user columns in table */
+  sqlite3_stmt *pLookup = 0;      /* Statement to query %_docsize */
+  int rc;                         /* Return Code */
+
+  assert( p->pConfig->bColumnsize );
+  rc = fts5StorageGetStmt(p, FTS5_STMT_LOOKUP_DOCSIZE, &pLookup, 0);
+  if( pLookup ){
+    int bCorrupt = 1;
+    assert( rc==SQLITE_OK );
+    sqlite3_bind_int64(pLookup, 1, iRowid);
+    if( SQLITE_ROW==sqlite3_step(pLookup) ){
+      const u8 *aBlob = sqlite3_column_blob(pLookup, 0);
+      int nBlob = sqlite3_column_bytes(pLookup, 0);
+      if( 0==fts5StorageDecodeSizeArray(aCol, nCol, aBlob, nBlob) ){
+        bCorrupt = 0;
+      }
+    }
+    rc = sqlite3_reset(pLookup);
+    if( bCorrupt && rc==SQLITE_OK ){
+      rc = FTS5_CORRUPT;
+    }
+  }else{
+    assert( rc!=SQLITE_OK );
+  }
+
+  return rc;
+}
+
+static int sqlite3Fts5StorageSize(Fts5Storage *p, int iCol, i64 *pnToken){
+  int rc = fts5StorageLoadTotals(p, 0);
+  if( rc==SQLITE_OK ){
+    *pnToken = 0;
+    if( iCol<0 ){
+      int i;
+      for(i=0; i<p->pConfig->nCol; i++){
+        *pnToken += p->aTotalSize[i];
+      }
+    }else if( iCol<p->pConfig->nCol ){
+      *pnToken = p->aTotalSize[iCol];
+    }else{
+      rc = SQLITE_RANGE;
+    }
+  }
+  return rc;
+}
+
+static int sqlite3Fts5StorageRowCount(Fts5Storage *p, i64 *pnRow){
+  int rc = fts5StorageLoadTotals(p, 0);
+  if( rc==SQLITE_OK ){
+    /* nTotalRow being zero does not necessarily indicate a corrupt 
+    ** database - it might be that the FTS5 table really does contain zero
+    ** rows. However this function is only called from the xRowCount() API,
+    ** and there is no way for that API to be invoked if the table contains
+    ** no rows. Hence the FTS5_CORRUPT return.  */
+    *pnRow = p->nTotalRow;
+    if( p->nTotalRow<=0 ) rc = FTS5_CORRUPT;
+  }
+  return rc;
+}
+
+/*
+** Flush any data currently held in-memory to disk.
+*/
+static int sqlite3Fts5StorageSync(Fts5Storage *p){
+  int rc = SQLITE_OK;
+  i64 iLastRowid = sqlite3_last_insert_rowid(p->pConfig->db);
+  if( p->bTotalsValid ){
+    rc = fts5StorageSaveTotals(p);
+    if( rc==SQLITE_OK ){
+      p->bTotalsValid = 0;
+    }
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexSync(p->pIndex);
+  }
+  sqlite3_set_last_insert_rowid(p->pConfig->db, iLastRowid);
+  return rc;
+}
+
+static int sqlite3Fts5StorageRollback(Fts5Storage *p){
+  p->bTotalsValid = 0;
+  return sqlite3Fts5IndexRollback(p->pIndex);
+}
+
+static int sqlite3Fts5StorageConfigValue(
+  Fts5Storage *p, 
+  const char *z,
+  sqlite3_value *pVal,
+  int iVal
+){
+  sqlite3_stmt *pReplace = 0;
+  int rc = fts5StorageGetStmt(p, FTS5_STMT_REPLACE_CONFIG, &pReplace, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_text(pReplace, 1, z, -1, SQLITE_STATIC);
+    if( pVal ){
+      sqlite3_bind_value(pReplace, 2, pVal);
+    }else{
+      sqlite3_bind_int(pReplace, 2, iVal);
+    }
+    sqlite3_step(pReplace);
+    rc = sqlite3_reset(pReplace);
+    sqlite3_bind_null(pReplace, 1);
+  }
+  if( rc==SQLITE_OK && pVal ){
+    int iNew = p->pConfig->iCookie + 1;
+    rc = sqlite3Fts5IndexSetCookie(p->pIndex, iNew);
+    if( rc==SQLITE_OK ){
+      p->pConfig->iCookie = iNew;
+    }
+  }
+  return rc;
+}
+
+#line 1 "fts5_tokenize.c"
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+
+/* #include "fts5Int.h" */
+
+/**************************************************************************
+** Start of ascii tokenizer implementation.
+*/
+
+/*
+** For tokenizers with no "unicode" modifier, the set of token characters
+** is the same as the set of ASCII range alphanumeric characters. 
+*/
+static unsigned char aAsciiTokenChar[128] = {
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,   /* 0x00..0x0F */
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,   /* 0x10..0x1F */
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,   /* 0x20..0x2F */
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 0, 0, 0, 0, 0, 0,   /* 0x30..0x3F */
+  0, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,   /* 0x40..0x4F */
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 0, 0, 0, 0, 0,   /* 0x50..0x5F */
+  0, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,   /* 0x60..0x6F */
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 0, 0, 0, 0, 0,   /* 0x70..0x7F */
+};
+
+typedef struct AsciiTokenizer AsciiTokenizer;
+struct AsciiTokenizer {
+  unsigned char aTokenChar[128];
+};
+
+static void fts5AsciiAddExceptions(
+  AsciiTokenizer *p, 
+  const char *zArg, 
+  int bTokenChars
+){
+  int i;
+  for(i=0; zArg[i]; i++){
+    if( (zArg[i] & 0x80)==0 ){
+      p->aTokenChar[(int)zArg[i]] = (unsigned char)bTokenChars;
+    }
+  }
+}
+
+/*
+** Delete a "ascii" tokenizer.
+*/
+static void fts5AsciiDelete(Fts5Tokenizer *p){
+  sqlite3_free(p);
+}
+
+/*
+** Create an "ascii" tokenizer.
+*/
+static int fts5AsciiCreate(
+  void *pUnused, 
+  const char **azArg, int nArg,
+  Fts5Tokenizer **ppOut
+){
+  int rc = SQLITE_OK;
+  AsciiTokenizer *p = 0;
+  UNUSED_PARAM(pUnused);
+  if( nArg%2 ){
+    rc = SQLITE_ERROR;
+  }else{
+    p = sqlite3_malloc(sizeof(AsciiTokenizer));
+    if( p==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      int i;
+      memset(p, 0, sizeof(AsciiTokenizer));
+      memcpy(p->aTokenChar, aAsciiTokenChar, sizeof(aAsciiTokenChar));
+      for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+        const char *zArg = azArg[i+1];
+        if( 0==sqlite3_stricmp(azArg[i], "tokenchars") ){
+          fts5AsciiAddExceptions(p, zArg, 1);
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "separators") ){
+          fts5AsciiAddExceptions(p, zArg, 0);
+        }else{
+          rc = SQLITE_ERROR;
+        }
+      }
+      if( rc!=SQLITE_OK ){
+        fts5AsciiDelete((Fts5Tokenizer*)p);
+        p = 0;
+      }
+    }
+  }
+
+  *ppOut = (Fts5Tokenizer*)p;
+  return rc;
+}
+
+
+static void asciiFold(char *aOut, const char *aIn, int nByte){
+  int i;
+  for(i=0; i<nByte; i++){
+    char c = aIn[i];
+    if( c>='A' && c<='Z' ) c += 32;
+    aOut[i] = c;
+  }
+}
+
+/*
+** Tokenize some text using the ascii tokenizer.
+*/
+static int fts5AsciiTokenize(
+  Fts5Tokenizer *pTokenizer,
+  void *pCtx,
+  int iUnused,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int nToken, int iStart, int iEnd)
+){
+  AsciiTokenizer *p = (AsciiTokenizer*)pTokenizer;
+  int rc = SQLITE_OK;
+  int ie;
+  int is = 0;
+
+  char aFold[64];
+  int nFold = sizeof(aFold);
+  char *pFold = aFold;
+  unsigned char *a = p->aTokenChar;
+
+  UNUSED_PARAM(iUnused);
+
+  while( is<nText && rc==SQLITE_OK ){
+    int nByte;
+
+    /* Skip any leading divider characters. */
+    while( is<nText && ((pText[is]&0x80)==0 && a[(int)pText[is]]==0) ){
+      is++;
+    }
+    if( is==nText ) break;
+
+    /* Count the token characters */
+    ie = is+1;
+    while( ie<nText && ((pText[ie]&0x80) || a[(int)pText[ie]] ) ){
+      ie++;
+    }
+
+    /* Fold to lower case */
+    nByte = ie-is;
+    if( nByte>nFold ){
+      if( pFold!=aFold ) sqlite3_free(pFold);
+      pFold = sqlite3_malloc64((sqlite3_int64)nByte*2);
+      if( pFold==0 ){
+        rc = SQLITE_NOMEM;
+        break;
+      }
+      nFold = nByte*2;
+    }
+    asciiFold(pFold, &pText[is], nByte);
+
+    /* Invoke the token callback */
+    rc = xToken(pCtx, 0, pFold, nByte, is, ie);
+    is = ie+1;
+  }
+  
+  if( pFold!=aFold ) sqlite3_free(pFold);
+  if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+  return rc;
+}
+
+/**************************************************************************
+** Start of unicode61 tokenizer implementation.
+*/
+
+
+/*
+** The following two macros - READ_UTF8 and WRITE_UTF8 - have been copied
+** from the sqlite3 source file utf.c. If this file is compiled as part
+** of the amalgamation, they are not required.
+*/
+#ifndef SQLITE_AMALGAMATION
+
+static const unsigned char sqlite3Utf8Trans1[] = {
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
+};
+
+#define READ_UTF8(zIn, zTerm, c)                           \
+  c = *(zIn++);                                            \
+  if( c>=0xc0 ){                                           \
+    c = sqlite3Utf8Trans1[c-0xc0];                         \
+    while( zIn!=zTerm && (*zIn & 0xc0)==0x80 ){            \
+      c = (c<<6) + (0x3f & *(zIn++));                      \
+    }                                                      \
+    if( c<0x80                                             \
+        || (c&0xFFFFF800)==0xD800                          \
+        || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }        \
+  }
+
+
+#define WRITE_UTF8(zOut, c) {                          \
+  if( c<0x00080 ){                                     \
+    *zOut++ = (unsigned char)(c&0xFF);                 \
+  }                                                    \
+  else if( c<0x00800 ){                                \
+    *zOut++ = 0xC0 + (unsigned char)((c>>6)&0x1F);     \
+    *zOut++ = 0x80 + (unsigned char)(c & 0x3F);        \
+  }                                                    \
+  else if( c<0x10000 ){                                \
+    *zOut++ = 0xE0 + (unsigned char)((c>>12)&0x0F);    \
+    *zOut++ = 0x80 + (unsigned char)((c>>6) & 0x3F);   \
+    *zOut++ = 0x80 + (unsigned char)(c & 0x3F);        \
+  }else{                                               \
+    *zOut++ = 0xF0 + (unsigned char)((c>>18) & 0x07);  \
+    *zOut++ = 0x80 + (unsigned char)((c>>12) & 0x3F);  \
+    *zOut++ = 0x80 + (unsigned char)((c>>6) & 0x3F);   \
+    *zOut++ = 0x80 + (unsigned char)(c & 0x3F);        \
+  }                                                    \
+}
+
+#endif /* ifndef SQLITE_AMALGAMATION */
+
+#define FTS5_SKIP_UTF8(zIn) {                               \
+  if( ((unsigned char)(*(zIn++)))>=0xc0 ){                              \
+    while( (((unsigned char)*zIn) & 0xc0)==0x80 ){ zIn++; }             \
+  }                                                    \
+}
+
+typedef struct Unicode61Tokenizer Unicode61Tokenizer;
+struct Unicode61Tokenizer {
+  unsigned char aTokenChar[128];  /* ASCII range token characters */
+  char *aFold;                    /* Buffer to fold text into */
+  int nFold;                      /* Size of aFold[] in bytes */
+  int eRemoveDiacritic;           /* True if remove_diacritics=1 is set */
+  int nException;
+  int *aiException;
+
+  unsigned char aCategory[32];    /* True for token char categories */
+};
+
+/* Values for eRemoveDiacritic (must match internals of fts5_unicode2.c) */
+#define FTS5_REMOVE_DIACRITICS_NONE    0
+#define FTS5_REMOVE_DIACRITICS_SIMPLE  1
+#define FTS5_REMOVE_DIACRITICS_COMPLEX 2
+
+static int fts5UnicodeAddExceptions(
+  Unicode61Tokenizer *p,          /* Tokenizer object */
+  const char *z,                  /* Characters to treat as exceptions */
+  int bTokenChars                 /* 1 for 'tokenchars', 0 for 'separators' */
+){
+  int rc = SQLITE_OK;
+  int n = (int)strlen(z);
+  int *aNew;
+
+  if( n>0 ){
+    aNew = (int*)sqlite3_realloc64(p->aiException,
+                                   (n+p->nException)*sizeof(int));
+    if( aNew ){
+      int nNew = p->nException;
+      const unsigned char *zCsr = (const unsigned char*)z;
+      const unsigned char *zTerm = (const unsigned char*)&z[n];
+      while( zCsr<zTerm ){
+        u32 iCode;
+        int bToken;
+        READ_UTF8(zCsr, zTerm, iCode);
+        if( iCode<128 ){
+          p->aTokenChar[iCode] = (unsigned char)bTokenChars;
+        }else{
+          bToken = p->aCategory[sqlite3Fts5UnicodeCategory(iCode)];
+          assert( (bToken==0 || bToken==1) ); 
+          assert( (bTokenChars==0 || bTokenChars==1) );
+          if( bToken!=bTokenChars && sqlite3Fts5UnicodeIsdiacritic(iCode)==0 ){
+            int i;
+            for(i=0; i<nNew; i++){
+              if( (u32)aNew[i]>iCode ) break;
+            }
+            memmove(&aNew[i+1], &aNew[i], (nNew-i)*sizeof(int));
+            aNew[i] = iCode;
+            nNew++;
+          }
+        }
+      }
+      p->aiException = aNew;
+      p->nException = nNew;
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Return true if the p->aiException[] array contains the value iCode.
+*/
+static int fts5UnicodeIsException(Unicode61Tokenizer *p, int iCode){
+  if( p->nException>0 ){
+    int *a = p->aiException;
+    int iLo = 0;
+    int iHi = p->nException-1;
+
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      if( iCode==a[iTest] ){
+        return 1;
+      }else if( iCode>a[iTest] ){
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+/*
+** Delete a "unicode61" tokenizer.
+*/
+static void fts5UnicodeDelete(Fts5Tokenizer *pTok){
+  if( pTok ){
+    Unicode61Tokenizer *p = (Unicode61Tokenizer*)pTok;
+    sqlite3_free(p->aiException);
+    sqlite3_free(p->aFold);
+    sqlite3_free(p);
+  }
+  return;
+}
+
+static int unicodeSetCategories(Unicode61Tokenizer *p, const char *zCat){
+  const char *z = zCat;
+
+  while( *z ){
+    while( *z==' ' || *z=='\t' ) z++;
+    if( *z && sqlite3Fts5UnicodeCatParse(z, p->aCategory) ){
+      return SQLITE_ERROR;
+    }
+    while( *z!=' ' && *z!='\t' && *z!='\0' ) z++;
+  }
+
+  sqlite3Fts5UnicodeAscii(p->aCategory, p->aTokenChar);
+  return SQLITE_OK;
+}
+
+/*
+** Create a "unicode61" tokenizer.
+*/
+static int fts5UnicodeCreate(
+  void *pUnused, 
+  const char **azArg, int nArg,
+  Fts5Tokenizer **ppOut
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Unicode61Tokenizer *p = 0;      /* New tokenizer object */ 
+
+  UNUSED_PARAM(pUnused);
+
+  if( nArg%2 ){
+    rc = SQLITE_ERROR;
+  }else{
+    p = (Unicode61Tokenizer*)sqlite3_malloc(sizeof(Unicode61Tokenizer));
+    if( p ){
+      const char *zCat = "L* N* Co";
+      int i;
+      memset(p, 0, sizeof(Unicode61Tokenizer));
+
+      p->eRemoveDiacritic = FTS5_REMOVE_DIACRITICS_SIMPLE;
+      p->nFold = 64;
+      p->aFold = sqlite3_malloc64(p->nFold * sizeof(char));
+      if( p->aFold==0 ){
+        rc = SQLITE_NOMEM;
+      }
+
+      /* Search for a "categories" argument */
+      for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+        if( 0==sqlite3_stricmp(azArg[i], "categories") ){
+          zCat = azArg[i+1];
+        }
+      }
+
+      if( rc==SQLITE_OK ){
+        rc = unicodeSetCategories(p, zCat);
+      }
+
+      for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+        const char *zArg = azArg[i+1];
+        if( 0==sqlite3_stricmp(azArg[i], "remove_diacritics") ){
+          if( (zArg[0]!='0' && zArg[0]!='1' && zArg[0]!='2') || zArg[1] ){
+            rc = SQLITE_ERROR;
+          }else{
+            p->eRemoveDiacritic = (zArg[0] - '0');
+            assert( p->eRemoveDiacritic==FTS5_REMOVE_DIACRITICS_NONE
+                 || p->eRemoveDiacritic==FTS5_REMOVE_DIACRITICS_SIMPLE
+                 || p->eRemoveDiacritic==FTS5_REMOVE_DIACRITICS_COMPLEX
+            );
+          }
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "tokenchars") ){
+          rc = fts5UnicodeAddExceptions(p, zArg, 1);
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "separators") ){
+          rc = fts5UnicodeAddExceptions(p, zArg, 0);
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "categories") ){
+          /* no-op */
+        }else{
+          rc = SQLITE_ERROR;
+        }
+      }
+
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+    if( rc!=SQLITE_OK ){
+      fts5UnicodeDelete((Fts5Tokenizer*)p);
+      p = 0;
+    }
+    *ppOut = (Fts5Tokenizer*)p;
+  }
+  return rc;
+}
+
+/*
+** Return true if, for the purposes of tokenizing with the tokenizer
+** passed as the first argument, codepoint iCode is considered a token 
+** character (not a separator).
+*/
+static int fts5UnicodeIsAlnum(Unicode61Tokenizer *p, int iCode){
+  return (
+    p->aCategory[sqlite3Fts5UnicodeCategory((u32)iCode)]
+    ^ fts5UnicodeIsException(p, iCode)
+  );
+}
+
+static int fts5UnicodeTokenize(
+  Fts5Tokenizer *pTokenizer,
+  void *pCtx,
+  int iUnused,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int nToken, int iStart, int iEnd)
+){
+  Unicode61Tokenizer *p = (Unicode61Tokenizer*)pTokenizer;
+  int rc = SQLITE_OK;
+  unsigned char *a = p->aTokenChar;
+
+  unsigned char *zTerm = (unsigned char*)&pText[nText];
+  unsigned char *zCsr = (unsigned char *)pText;
+
+  /* Output buffer */
+  char *aFold = p->aFold;
+  int nFold = p->nFold;
+  const char *pEnd = &aFold[nFold-6];
+
+  UNUSED_PARAM(iUnused);
+
+  /* Each iteration of this loop gobbles up a contiguous run of separators,
+  ** then the next token.  */
+  while( rc==SQLITE_OK ){
+    u32 iCode;                    /* non-ASCII codepoint read from input */
+    char *zOut = aFold;
+    int is;
+    int ie;
+
+    /* Skip any separator characters. */
+    while( 1 ){
+      if( zCsr>=zTerm ) goto tokenize_done;
+      if( *zCsr & 0x80 ) {
+        /* A character outside of the ascii range. Skip past it if it is
+        ** a separator character. Or break out of the loop if it is not. */
+        is = zCsr - (unsigned char*)pText;
+        READ_UTF8(zCsr, zTerm, iCode);
+        if( fts5UnicodeIsAlnum(p, iCode) ){
+          goto non_ascii_tokenchar;
+        }
+      }else{
+        if( a[*zCsr] ){
+          is = zCsr - (unsigned char*)pText;
+          goto ascii_tokenchar;
+        }
+        zCsr++;
+      }
+    }
+
+    /* Run through the tokenchars. Fold them into the output buffer along
+    ** the way.  */
+    while( zCsr<zTerm ){
+
+      /* Grow the output buffer so that there is sufficient space to fit the
+      ** largest possible utf-8 character.  */
+      if( zOut>pEnd ){
+        aFold = sqlite3_malloc64((sqlite3_int64)nFold*2);
+        if( aFold==0 ){
+          rc = SQLITE_NOMEM;
+          goto tokenize_done;
+        }
+        zOut = &aFold[zOut - p->aFold];
+        memcpy(aFold, p->aFold, nFold);
+        sqlite3_free(p->aFold);
+        p->aFold = aFold;
+        p->nFold = nFold = nFold*2;
+        pEnd = &aFold[nFold-6];
+      }
+
+      if( *zCsr & 0x80 ){
+        /* An non-ascii-range character. Fold it into the output buffer if
+        ** it is a token character, or break out of the loop if it is not. */
+        READ_UTF8(zCsr, zTerm, iCode);
+        if( fts5UnicodeIsAlnum(p,iCode)||sqlite3Fts5UnicodeIsdiacritic(iCode) ){
+ non_ascii_tokenchar:
+          iCode = sqlite3Fts5UnicodeFold(iCode, p->eRemoveDiacritic);
+          if( iCode ) WRITE_UTF8(zOut, iCode);
+        }else{
+          break;
+        }
+      }else if( a[*zCsr]==0 ){
+        /* An ascii-range separator character. End of token. */
+        break; 
+      }else{
+ ascii_tokenchar:
+        if( *zCsr>='A' && *zCsr<='Z' ){
+          *zOut++ = *zCsr + 32;
+        }else{
+          *zOut++ = *zCsr;
+        }
+        zCsr++;
+      }
+      ie = zCsr - (unsigned char*)pText;
+    }
+
+    /* Invoke the token callback */
+    rc = xToken(pCtx, 0, aFold, zOut-aFold, is, ie); 
+  }
+  
+ tokenize_done:
+  if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+  return rc;
+}
+
+/**************************************************************************
+** Start of porter stemmer implementation.
+*/
+
+/* Any tokens larger than this (in bytes) are passed through without
+** stemming. */
+#define FTS5_PORTER_MAX_TOKEN 64
+
+typedef struct PorterTokenizer PorterTokenizer;
+struct PorterTokenizer {
+  fts5_tokenizer tokenizer;       /* Parent tokenizer module */
+  Fts5Tokenizer *pTokenizer;      /* Parent tokenizer instance */
+  char aBuf[FTS5_PORTER_MAX_TOKEN + 64];
+};
+
+/*
+** Delete a "porter" tokenizer.
+*/
+static void fts5PorterDelete(Fts5Tokenizer *pTok){
+  if( pTok ){
+    PorterTokenizer *p = (PorterTokenizer*)pTok;
+    if( p->pTokenizer ){
+      p->tokenizer.xDelete(p->pTokenizer);
+    }
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Create a "porter" tokenizer.
+*/
+static int fts5PorterCreate(
+  void *pCtx, 
+  const char **azArg, int nArg,
+  Fts5Tokenizer **ppOut
+){
+  fts5_api *pApi = (fts5_api*)pCtx;
+  int rc = SQLITE_OK;
+  PorterTokenizer *pRet;
+  void *pUserdata = 0;
+  const char *zBase = "unicode61";
+
+  if( nArg>0 ){
+    zBase = azArg[0];
+  }
+
+  pRet = (PorterTokenizer*)sqlite3_malloc(sizeof(PorterTokenizer));
+  if( pRet ){
+    memset(pRet, 0, sizeof(PorterTokenizer));
+    rc = pApi->xFindTokenizer(pApi, zBase, &pUserdata, &pRet->tokenizer);
+  }else{
+    rc = SQLITE_NOMEM;
+  }
+  if( rc==SQLITE_OK ){
+    int nArg2 = (nArg>0 ? nArg-1 : 0);
+    const char **azArg2 = (nArg2 ? &azArg[1] : 0);
+    rc = pRet->tokenizer.xCreate(pUserdata, azArg2, nArg2, &pRet->pTokenizer);
+  }
+
+  if( rc!=SQLITE_OK ){
+    fts5PorterDelete((Fts5Tokenizer*)pRet);
+    pRet = 0;
+  }
+  *ppOut = (Fts5Tokenizer*)pRet;
+  return rc;
+}
+
+typedef struct PorterContext PorterContext;
+struct PorterContext {
+  void *pCtx;
+  int (*xToken)(void*, int, const char*, int, int, int);
+  char *aBuf;
+};
+
+typedef struct PorterRule PorterRule;
+struct PorterRule {
+  const char *zSuffix;
+  int nSuffix;
+  int (*xCond)(char *zStem, int nStem);
+  const char *zOutput;
+  int nOutput;
+};
+
+#if 0
+static int fts5PorterApply(char *aBuf, int *pnBuf, PorterRule *aRule){
+  int ret = -1;
+  int nBuf = *pnBuf;
+  PorterRule *p;
+
+  for(p=aRule; p->zSuffix; p++){
+    assert( strlen(p->zSuffix)==p->nSuffix );
+    assert( strlen(p->zOutput)==p->nOutput );
+    if( nBuf<p->nSuffix ) continue;
+    if( 0==memcmp(&aBuf[nBuf - p->nSuffix], p->zSuffix, p->nSuffix) ) break;
+  }
+
+  if( p->zSuffix ){
+    int nStem = nBuf - p->nSuffix;
+    if( p->xCond==0 || p->xCond(aBuf, nStem) ){
+      memcpy(&aBuf[nStem], p->zOutput, p->nOutput);
+      *pnBuf = nStem + p->nOutput;
+      ret = p - aRule;
+    }
+  }
+
+  return ret;
+}
+#endif
+
+static int fts5PorterIsVowel(char c, int bYIsVowel){
+  return (
+      c=='a' || c=='e' || c=='i' || c=='o' || c=='u' || (bYIsVowel && c=='y')
+  );
+}
+
+static int fts5PorterGobbleVC(char *zStem, int nStem, int bPrevCons){
+  int i;
+  int bCons = bPrevCons;
+
+  /* Scan for a vowel */
+  for(i=0; i<nStem; i++){
+    if( 0==(bCons = !fts5PorterIsVowel(zStem[i], bCons)) ) break;
+  }
+
+  /* Scan for a consonent */
+  for(i++; i<nStem; i++){
+    if( (bCons = !fts5PorterIsVowel(zStem[i], bCons)) ) return i+1;
+  }
+  return 0;
+}
+
+/* porter rule condition: (m > 0) */
+static int fts5Porter_MGt0(char *zStem, int nStem){
+  return !!fts5PorterGobbleVC(zStem, nStem, 0);
+}
+
+/* porter rule condition: (m > 1) */
+static int fts5Porter_MGt1(char *zStem, int nStem){
+  int n;
+  n = fts5PorterGobbleVC(zStem, nStem, 0);
+  if( n && fts5PorterGobbleVC(&zStem[n], nStem-n, 1) ){
+    return 1;
+  }
+  return 0;
+}
+
+/* porter rule condition: (m = 1) */
+static int fts5Porter_MEq1(char *zStem, int nStem){
+  int n;
+  n = fts5PorterGobbleVC(zStem, nStem, 0);
+  if( n && 0==fts5PorterGobbleVC(&zStem[n], nStem-n, 1) ){
+    return 1;
+  }
+  return 0;
+}
+
+/* porter rule condition: (*o) */
+static int fts5Porter_Ostar(char *zStem, int nStem){
+  if( zStem[nStem-1]=='w' || zStem[nStem-1]=='x' || zStem[nStem-1]=='y' ){
+    return 0;
+  }else{
+    int i;
+    int mask = 0;
+    int bCons = 0;
+    for(i=0; i<nStem; i++){
+      bCons = !fts5PorterIsVowel(zStem[i], bCons);
+      assert( bCons==0 || bCons==1 );
+      mask = (mask << 1) + bCons;
+    }
+    return ((mask & 0x0007)==0x0005);
+  }
+}
+
+/* porter rule condition: (m > 1 and (*S or *T)) */
+static int fts5Porter_MGt1_and_S_or_T(char *zStem, int nStem){
+  assert( nStem>0 );
+  return (zStem[nStem-1]=='s' || zStem[nStem-1]=='t') 
+      && fts5Porter_MGt1(zStem, nStem);
+}
+
+/* porter rule condition: (*v*) */
+static int fts5Porter_Vowel(char *zStem, int nStem){
+  int i;
+  for(i=0; i<nStem; i++){
+    if( fts5PorterIsVowel(zStem[i], i>0) ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+
+/**************************************************************************
+***************************************************************************
+** GENERATED CODE STARTS HERE (mkportersteps.tcl)
+*/
+
+static int fts5PorterStep4(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+    
+    case 'a': 
+      if( nBuf>2 && 0==memcmp("al", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+  
+    case 'c': 
+      if( nBuf>4 && 0==memcmp("ance", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }else if( nBuf>4 && 0==memcmp("ence", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }
+      break;
+  
+    case 'e': 
+      if( nBuf>2 && 0==memcmp("er", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+  
+    case 'i': 
+      if( nBuf>2 && 0==memcmp("ic", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+  
+    case 'l': 
+      if( nBuf>4 && 0==memcmp("able", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }else if( nBuf>4 && 0==memcmp("ible", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }
+      break;
+  
+    case 'n': 
+      if( nBuf>3 && 0==memcmp("ant", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }else if( nBuf>5 && 0==memcmp("ement", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-5) ){
+          *pnBuf = nBuf - 5;
+        }
+      }else if( nBuf>4 && 0==memcmp("ment", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }else if( nBuf>3 && 0==memcmp("ent", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+  
+    case 'o': 
+      if( nBuf>3 && 0==memcmp("ion", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1_and_S_or_T(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }else if( nBuf>2 && 0==memcmp("ou", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+  
+    case 's': 
+      if( nBuf>3 && 0==memcmp("ism", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+  
+    case 't': 
+      if( nBuf>3 && 0==memcmp("ate", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }else if( nBuf>3 && 0==memcmp("iti", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+  
+    case 'u': 
+      if( nBuf>3 && 0==memcmp("ous", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+  
+    case 'v': 
+      if( nBuf>3 && 0==memcmp("ive", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+  
+    case 'z': 
+      if( nBuf>3 && 0==memcmp("ize", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+  
+  }
+  return ret;
+}
+  
+
+static int fts5PorterStep1B2(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+    
+    case 'a': 
+      if( nBuf>2 && 0==memcmp("at", &aBuf[nBuf-2], 2) ){
+        memcpy(&aBuf[nBuf-2], "ate", 3);
+        *pnBuf = nBuf - 2 + 3;
+        ret = 1;
+      }
+      break;
+  
+    case 'b': 
+      if( nBuf>2 && 0==memcmp("bl", &aBuf[nBuf-2], 2) ){
+        memcpy(&aBuf[nBuf-2], "ble", 3);
+        *pnBuf = nBuf - 2 + 3;
+        ret = 1;
+      }
+      break;
+  
+    case 'i': 
+      if( nBuf>2 && 0==memcmp("iz", &aBuf[nBuf-2], 2) ){
+        memcpy(&aBuf[nBuf-2], "ize", 3);
+        *pnBuf = nBuf - 2 + 3;
+        ret = 1;
+      }
+      break;
+  
+  }
+  return ret;
+}
+  
+
+static int fts5PorterStep2(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+    
+    case 'a': 
+      if( nBuf>7 && 0==memcmp("ational", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ate", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>6 && 0==memcmp("tional", &aBuf[nBuf-6], 6) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-6) ){
+          memcpy(&aBuf[nBuf-6], "tion", 4);
+          *pnBuf = nBuf - 6 + 4;
+        }
+      }
+      break;
+  
+    case 'c': 
+      if( nBuf>4 && 0==memcmp("enci", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ence", 4);
+          *pnBuf = nBuf - 4 + 4;
+        }
+      }else if( nBuf>4 && 0==memcmp("anci", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ance", 4);
+          *pnBuf = nBuf - 4 + 4;
+        }
+      }
+      break;
+  
+    case 'e': 
+      if( nBuf>4 && 0==memcmp("izer", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ize", 3);
+          *pnBuf = nBuf - 4 + 3;
+        }
+      }
+      break;
+  
+    case 'g': 
+      if( nBuf>4 && 0==memcmp("logi", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "log", 3);
+          *pnBuf = nBuf - 4 + 3;
+        }
+      }
+      break;
+  
+    case 'l': 
+      if( nBuf>3 && 0==memcmp("bli", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          memcpy(&aBuf[nBuf-3], "ble", 3);
+          *pnBuf = nBuf - 3 + 3;
+        }
+      }else if( nBuf>4 && 0==memcmp("alli", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "al", 2);
+          *pnBuf = nBuf - 4 + 2;
+        }
+      }else if( nBuf>5 && 0==memcmp("entli", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ent", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }else if( nBuf>3 && 0==memcmp("eli", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          memcpy(&aBuf[nBuf-3], "e", 1);
+          *pnBuf = nBuf - 3 + 1;
+        }
+      }else if( nBuf>5 && 0==memcmp("ousli", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ous", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }
+      break;
+  
+    case 'o': 
+      if( nBuf>7 && 0==memcmp("ization", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ize", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>5 && 0==memcmp("ation", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ate", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }else if( nBuf>4 && 0==memcmp("ator", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ate", 3);
+          *pnBuf = nBuf - 4 + 3;
+        }
+      }
+      break;
+  
+    case 's': 
+      if( nBuf>5 && 0==memcmp("alism", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "al", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }else if( nBuf>7 && 0==memcmp("iveness", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ive", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>7 && 0==memcmp("fulness", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ful", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>7 && 0==memcmp("ousness", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ous", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }
+      break;
+  
+    case 't': 
+      if( nBuf>5 && 0==memcmp("aliti", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "al", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }else if( nBuf>5 && 0==memcmp("iviti", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ive", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }else if( nBuf>6 && 0==memcmp("biliti", &aBuf[nBuf-6], 6) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-6) ){
+          memcpy(&aBuf[nBuf-6], "ble", 3);
+          *pnBuf = nBuf - 6 + 3;
+        }
+      }
+      break;
+  
+  }
+  return ret;
+}
+  
+
+static int fts5PorterStep3(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+    
+    case 'a': 
+      if( nBuf>4 && 0==memcmp("ical", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ic", 2);
+          *pnBuf = nBuf - 4 + 2;
+        }
+      }
+      break;
+  
+    case 's': 
+      if( nBuf>4 && 0==memcmp("ness", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }
+      break;
+  
+    case 't': 
+      if( nBuf>5 && 0==memcmp("icate", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ic", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }else if( nBuf>5 && 0==memcmp("iciti", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ic", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }
+      break;
+  
+    case 'u': 
+      if( nBuf>3 && 0==memcmp("ful", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+  
+    case 'v': 
+      if( nBuf>5 && 0==memcmp("ative", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          *pnBuf = nBuf - 5;
+        }
+      }
+      break;
+  
+    case 'z': 
+      if( nBuf>5 && 0==memcmp("alize", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "al", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }
+      break;
+  
+  }
+  return ret;
+}
+  
+
+static int fts5PorterStep1B(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+    
+    case 'e': 
+      if( nBuf>3 && 0==memcmp("eed", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          memcpy(&aBuf[nBuf-3], "ee", 2);
+          *pnBuf = nBuf - 3 + 2;
+        }
+      }else if( nBuf>2 && 0==memcmp("ed", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_Vowel(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+          ret = 1;
+        }
+      }
+      break;
+  
+    case 'n': 
+      if( nBuf>3 && 0==memcmp("ing", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_Vowel(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+          ret = 1;
+        }
+      }
+      break;
+  
+  }
+  return ret;
+}
+  
+/* 
+** GENERATED CODE ENDS HERE (mkportersteps.tcl)
+***************************************************************************
+**************************************************************************/
+
+static void fts5PorterStep1A(char *aBuf, int *pnBuf){
+  int nBuf = *pnBuf;
+  if( aBuf[nBuf-1]=='s' ){
+    if( aBuf[nBuf-2]=='e' ){
+      if( (nBuf>4 && aBuf[nBuf-4]=='s' && aBuf[nBuf-3]=='s') 
+       || (nBuf>3 && aBuf[nBuf-3]=='i' )
+      ){
+        *pnBuf = nBuf-2;
+      }else{
+        *pnBuf = nBuf-1;
+      }
+    }
+    else if( aBuf[nBuf-2]!='s' ){
+      *pnBuf = nBuf-1;
+    }
+  }
+}
+
+static int fts5PorterCb(
+  void *pCtx, 
+  int tflags,
+  const char *pToken, 
+  int nToken, 
+  int iStart, 
+  int iEnd
+){
+  PorterContext *p = (PorterContext*)pCtx;
+
+  char *aBuf;
+  int nBuf;
+
+  if( nToken>FTS5_PORTER_MAX_TOKEN || nToken<3 ) goto pass_through;
+  aBuf = p->aBuf;
+  nBuf = nToken;
+  memcpy(aBuf, pToken, nBuf);
+
+  /* Step 1. */
+  fts5PorterStep1A(aBuf, &nBuf);
+  if( fts5PorterStep1B(aBuf, &nBuf) ){
+    if( fts5PorterStep1B2(aBuf, &nBuf)==0 ){
+      char c = aBuf[nBuf-1];
+      if( fts5PorterIsVowel(c, 0)==0 
+       && c!='l' && c!='s' && c!='z' && c==aBuf[nBuf-2] 
+      ){
+        nBuf--;
+      }else if( fts5Porter_MEq1(aBuf, nBuf) && fts5Porter_Ostar(aBuf, nBuf) ){
+        aBuf[nBuf++] = 'e';
+      }
+    }
+  }
+
+  /* Step 1C. */
+  if( aBuf[nBuf-1]=='y' && fts5Porter_Vowel(aBuf, nBuf-1) ){
+    aBuf[nBuf-1] = 'i';
+  }
+
+  /* Steps 2 through 4. */
+  fts5PorterStep2(aBuf, &nBuf);
+  fts5PorterStep3(aBuf, &nBuf);
+  fts5PorterStep4(aBuf, &nBuf);
+
+  /* Step 5a. */
+  assert( nBuf>0 );
+  if( aBuf[nBuf-1]=='e' ){
+    if( fts5Porter_MGt1(aBuf, nBuf-1) 
+     || (fts5Porter_MEq1(aBuf, nBuf-1) && !fts5Porter_Ostar(aBuf, nBuf-1))
+    ){
+      nBuf--;
+    }
+  }
+
+  /* Step 5b. */
+  if( nBuf>1 && aBuf[nBuf-1]=='l' 
+   && aBuf[nBuf-2]=='l' && fts5Porter_MGt1(aBuf, nBuf-1) 
+  ){
+    nBuf--;
+  }
+
+  return p->xToken(p->pCtx, tflags, aBuf, nBuf, iStart, iEnd);
+
+ pass_through:
+  return p->xToken(p->pCtx, tflags, pToken, nToken, iStart, iEnd);
+}
+
+/*
+** Tokenize using the porter tokenizer.
+*/
+static int fts5PorterTokenize(
+  Fts5Tokenizer *pTokenizer,
+  void *pCtx,
+  int flags,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int nToken, int iStart, int iEnd)
+){
+  PorterTokenizer *p = (PorterTokenizer*)pTokenizer;
+  PorterContext sCtx;
+  sCtx.xToken = xToken;
+  sCtx.pCtx = pCtx;
+  sCtx.aBuf = p->aBuf;
+  return p->tokenizer.xTokenize(
+      p->pTokenizer, (void*)&sCtx, flags, pText, nText, fts5PorterCb
+  );
+}
+
+/**************************************************************************
+** Start of trigram implementation.
+*/
+typedef struct TrigramTokenizer TrigramTokenizer;
+struct TrigramTokenizer {
+  int bFold;                      /* True to fold to lower-case */
+  int iFoldParam;                 /* Parameter to pass to Fts5UnicodeFold() */
+};
+
+/*
+** Free a trigram tokenizer.
+*/
+static void fts5TriDelete(Fts5Tokenizer *p){
+  sqlite3_free(p);
+}
+
+/*
+** Allocate a trigram tokenizer.
+*/
+static int fts5TriCreate(
+  void *pUnused,
+  const char **azArg,
+  int nArg,
+  Fts5Tokenizer **ppOut
+){
+  int rc = SQLITE_OK;
+  TrigramTokenizer *pNew = (TrigramTokenizer*)sqlite3_malloc(sizeof(*pNew));
+  UNUSED_PARAM(pUnused);
+  if( pNew==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    int i;
+    pNew->bFold = 1;
+    pNew->iFoldParam = 0;
+    for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+      const char *zArg = azArg[i+1];
+      if( 0==sqlite3_stricmp(azArg[i], "case_sensitive") ){
+        if( (zArg[0]!='0' && zArg[0]!='1') || zArg[1] ){
+          rc = SQLITE_ERROR;
+        }else{
+          pNew->bFold = (zArg[0]=='0');
+        }
+      }else if( 0==sqlite3_stricmp(azArg[i], "remove_diacritics") ){
+        if( (zArg[0]!='0' && zArg[0]!='1' && zArg[0]!='2') || zArg[1] ){
+          rc = SQLITE_ERROR;
+        }else{
+          pNew->iFoldParam = (zArg[0]!='0') ? 2 : 0;
+        }
+      }else{
+        rc = SQLITE_ERROR;
+      }
+    }
+
+    if( pNew->iFoldParam!=0 && pNew->bFold==0 ){
+      rc = SQLITE_ERROR;
+    }
+
+    if( rc!=SQLITE_OK ){
+      fts5TriDelete((Fts5Tokenizer*)pNew);
+      pNew = 0;
+    }
+  }
+  *ppOut = (Fts5Tokenizer*)pNew;
+  return rc;
+}
+
+/*
+** Trigram tokenizer tokenize routine.
+*/
+static int fts5TriTokenize(
+  Fts5Tokenizer *pTok,
+  void *pCtx,
+  int unusedFlags,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int, int, int)
+){
+  TrigramTokenizer *p = (TrigramTokenizer*)pTok;
+  int rc = SQLITE_OK;
+  char aBuf[32];
+  char *zOut = aBuf;
+  int ii;
+  const unsigned char *zIn = (const unsigned char*)pText;
+  const unsigned char *zEof = &zIn[nText];
+  u32 iCode;
+  int aStart[3];                  /* Input offset of each character in aBuf[] */
+
+  UNUSED_PARAM(unusedFlags);
+
+  /* Populate aBuf[] with the characters for the first trigram. */
+  for(ii=0; ii<3; ii++){
+    do {
+      aStart[ii] = zIn - (const unsigned char*)pText;
+      READ_UTF8(zIn, zEof, iCode);
+      if( iCode==0 ) return SQLITE_OK;
+      if( p->bFold ) iCode = sqlite3Fts5UnicodeFold(iCode, p->iFoldParam);
+    }while( iCode==0 );
+    WRITE_UTF8(zOut, iCode);
+  }
+
+  /* At the start of each iteration of this loop:
+  **
+  **  aBuf:      Contains 3 characters. The 3 characters of the next trigram.
+  **  zOut:      Points to the byte following the last character in aBuf.
+  **  aStart[3]: Contains the byte offset in the input text corresponding
+  **             to the start of each of the three characters in the buffer.
+  */
+  assert( zIn<=zEof );
+  while( 1 ){
+    int iNext;                    /* Start of character following current tri */
+    const char *z1;
+
+    /* Read characters from the input up until the first non-diacritic */
+    do {
+      iNext = zIn - (const unsigned char*)pText;
+      READ_UTF8(zIn, zEof, iCode);
+      if( iCode==0 ) break;
+      if( p->bFold ) iCode = sqlite3Fts5UnicodeFold(iCode, p->iFoldParam);
+    }while( iCode==0 );
+
+    /* Pass the current trigram back to fts5 */
+    rc = xToken(pCtx, 0, aBuf, zOut-aBuf, aStart[0], iNext);
+    if( iCode==0 || rc!=SQLITE_OK ) break;
+
+    /* Remove the first character from buffer aBuf[]. Append the character
+    ** with codepoint iCode.  */
+    z1 = aBuf;
+    FTS5_SKIP_UTF8(z1);
+    memmove(aBuf, z1, zOut - z1);
+    zOut -= (z1 - aBuf);
+    WRITE_UTF8(zOut, iCode);
+
+    /* Update the aStart[] array */
+    aStart[0] = aStart[1];
+    aStart[1] = aStart[2];
+    aStart[2] = iNext;
+  }
+
+  return rc;
+}
+
+/*
+** Argument xCreate is a pointer to a constructor function for a tokenizer.
+** pTok is a tokenizer previously created using the same method. This function
+** returns one of FTS5_PATTERN_NONE, FTS5_PATTERN_LIKE or FTS5_PATTERN_GLOB
+** indicating the style of pattern matching that the tokenizer can support.
+** In practice, this is:
+**
+**     "trigram" tokenizer, case_sensitive=1 - FTS5_PATTERN_GLOB
+**     "trigram" tokenizer, case_sensitive=0 (the default) - FTS5_PATTERN_LIKE
+**     all other tokenizers - FTS5_PATTERN_NONE
+*/
+static int sqlite3Fts5TokenizerPattern(
+    int (*xCreate)(void*, const char**, int, Fts5Tokenizer**),
+    Fts5Tokenizer *pTok
+){
+  if( xCreate==fts5TriCreate ){
+    TrigramTokenizer *p = (TrigramTokenizer*)pTok;
+    if( p->iFoldParam==0 ){
+      return p->bFold ? FTS5_PATTERN_LIKE : FTS5_PATTERN_GLOB;
+    }
+  }
+  return FTS5_PATTERN_NONE;
+}
+
+/*
+** Register all built-in tokenizers with FTS5.
+*/
+static int sqlite3Fts5TokenizerInit(fts5_api *pApi){
+  struct BuiltinTokenizer {
+    const char *zName;
+    fts5_tokenizer x;
+  } aBuiltin[] = {
+    { "unicode61", {fts5UnicodeCreate, fts5UnicodeDelete, fts5UnicodeTokenize}},
+    { "ascii",     {fts5AsciiCreate, fts5AsciiDelete, fts5AsciiTokenize }},
+    { "porter",    {fts5PorterCreate, fts5PorterDelete, fts5PorterTokenize }},
+    { "trigram",   {fts5TriCreate, fts5TriDelete, fts5TriTokenize}},
+  };
+  
+  int rc = SQLITE_OK;             /* Return code */
+  int i;                          /* To iterate through builtin functions */
+
+  for(i=0; rc==SQLITE_OK && i<ArraySize(aBuiltin); i++){
+    rc = pApi->xCreateTokenizer(pApi,
+        aBuiltin[i].zName,
+        (void*)pApi,
+        &aBuiltin[i].x,
+        0
+    );
+  }
+
+  return rc;
+}
+
+#line 1 "fts5_unicode2.c"
+/*
+** 2012-05-25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+/*
+** DO NOT EDIT THIS MACHINE GENERATED FILE.
+*/
+
+
+#include <assert.h>
+
+
+
+/*
+** If the argument is a codepoint corresponding to a lowercase letter
+** in the ASCII range with a diacritic added, return the codepoint
+** of the ASCII letter only. For example, if passed 235 - "LATIN
+** SMALL LETTER E WITH DIAERESIS" - return 65 ("LATIN SMALL LETTER
+** E"). The resuls of passing a codepoint that corresponds to an
+** uppercase letter are undefined.
+*/
+static int fts5_remove_diacritic(int c, int bComplex){
+  unsigned short aDia[] = {
+        0,  1797,  1848,  1859,  1891,  1928,  1940,  1995, 
+     2024,  2040,  2060,  2110,  2168,  2206,  2264,  2286, 
+     2344,  2383,  2472,  2488,  2516,  2596,  2668,  2732, 
+     2782,  2842,  2894,  2954,  2984,  3000,  3028,  3336, 
+     3456,  3696,  3712,  3728,  3744,  3766,  3832,  3896, 
+     3912,  3928,  3944,  3968,  4008,  4040,  4056,  4106, 
+     4138,  4170,  4202,  4234,  4266,  4296,  4312,  4344, 
+     4408,  4424,  4442,  4472,  4488,  4504,  6148,  6198, 
+     6264,  6280,  6360,  6429,  6505,  6529, 61448, 61468, 
+    61512, 61534, 61592, 61610, 61642, 61672, 61688, 61704, 
+    61726, 61784, 61800, 61816, 61836, 61880, 61896, 61914, 
+    61948, 61998, 62062, 62122, 62154, 62184, 62200, 62218, 
+    62252, 62302, 62364, 62410, 62442, 62478, 62536, 62554, 
+    62584, 62604, 62640, 62648, 62656, 62664, 62730, 62766, 
+    62830, 62890, 62924, 62974, 63032, 63050, 63082, 63118, 
+    63182, 63242, 63274, 63310, 63368, 63390, 
+  };
+#define HIBIT ((unsigned char)0x80)
+  unsigned char aChar[] = {
+    '\0',      'a',       'c',       'e',       'i',       'n',       
+    'o',       'u',       'y',       'y',       'a',       'c',       
+    'd',       'e',       'e',       'g',       'h',       'i',       
+    'j',       'k',       'l',       'n',       'o',       'r',       
+    's',       't',       'u',       'u',       'w',       'y',       
+    'z',       'o',       'u',       'a',       'i',       'o',       
+    'u',       'u'|HIBIT, 'a'|HIBIT, 'g',       'k',       'o',       
+    'o'|HIBIT, 'j',       'g',       'n',       'a'|HIBIT, 'a',       
+    'e',       'i',       'o',       'r',       'u',       's',       
+    't',       'h',       'a',       'e',       'o'|HIBIT, 'o',       
+    'o'|HIBIT, 'y',       '\0',      '\0',      '\0',      '\0',      
+    '\0',      '\0',      '\0',      '\0',      'a',       'b',       
+    'c'|HIBIT, 'd',       'd',       'e'|HIBIT, 'e',       'e'|HIBIT, 
+    'f',       'g',       'h',       'h',       'i',       'i'|HIBIT, 
+    'k',       'l',       'l'|HIBIT, 'l',       'm',       'n',       
+    'o'|HIBIT, 'p',       'r',       'r'|HIBIT, 'r',       's',       
+    's'|HIBIT, 't',       'u',       'u'|HIBIT, 'v',       'w',       
+    'w',       'x',       'y',       'z',       'h',       't',       
+    'w',       'y',       'a',       'a'|HIBIT, 'a'|HIBIT, 'a'|HIBIT, 
+    'e',       'e'|HIBIT, 'e'|HIBIT, 'i',       'o',       'o'|HIBIT, 
+    'o'|HIBIT, 'o'|HIBIT, 'u',       'u'|HIBIT, 'u'|HIBIT, 'y',       
+  };
+
+  unsigned int key = (((unsigned int)c)<<3) | 0x00000007;
+  int iRes = 0;
+  int iHi = sizeof(aDia)/sizeof(aDia[0]) - 1;
+  int iLo = 0;
+  while( iHi>=iLo ){
+    int iTest = (iHi + iLo) / 2;
+    if( key >= aDia[iTest] ){
+      iRes = iTest;
+      iLo = iTest+1;
+    }else{
+      iHi = iTest-1;
+    }
+  }
+  assert( key>=aDia[iRes] );
+  if( bComplex==0 && (aChar[iRes] & 0x80) ) return c;
+  return (c > (aDia[iRes]>>3) + (aDia[iRes]&0x07)) ? c : ((int)aChar[iRes] & 0x7F);
+}
+
+
+/*
+** Return true if the argument interpreted as a unicode codepoint
+** is a diacritical modifier character.
+*/
+static int sqlite3Fts5UnicodeIsdiacritic(int c){
+  unsigned int mask0 = 0x08029FDF;
+  unsigned int mask1 = 0x000361F8;
+  if( c<768 || c>817 ) return 0;
+  return (c < 768+32) ?
+      (mask0 & ((unsigned int)1 << (c-768))) :
+      (mask1 & ((unsigned int)1 << (c-768-32)));
+}
+
+
+/*
+** Interpret the argument as a unicode codepoint. If the codepoint
+** is an upper case character that has a lower case equivalent,
+** return the codepoint corresponding to the lower case version.
+** Otherwise, return a copy of the argument.
+**
+** The results are undefined if the value passed to this function
+** is less than zero.
+*/
+static int sqlite3Fts5UnicodeFold(int c, int eRemoveDiacritic){
+  /* Each entry in the following array defines a rule for folding a range
+  ** of codepoints to lower case. The rule applies to a range of nRange
+  ** codepoints starting at codepoint iCode.
+  **
+  ** If the least significant bit in flags is clear, then the rule applies
+  ** to all nRange codepoints (i.e. all nRange codepoints are upper case and
+  ** need to be folded). Or, if it is set, then the rule only applies to
+  ** every second codepoint in the range, starting with codepoint C.
+  **
+  ** The 7 most significant bits in flags are an index into the aiOff[]
+  ** array. If a specific codepoint C does require folding, then its lower
+  ** case equivalent is ((C + aiOff[flags>>1]) & 0xFFFF).
+  **
+  ** The contents of this array are generated by parsing the CaseFolding.txt
+  ** file distributed as part of the "Unicode Character Database". See
+  ** http://www.unicode.org for details.
+  */
+  static const struct TableEntry {
+    unsigned short iCode;
+    unsigned char flags;
+    unsigned char nRange;
+  } aEntry[] = {
+    {65, 14, 26},          {181, 64, 1},          {192, 14, 23},
+    {216, 14, 7},          {256, 1, 48},          {306, 1, 6},
+    {313, 1, 16},          {330, 1, 46},          {376, 116, 1},
+    {377, 1, 6},           {383, 104, 1},         {385, 50, 1},
+    {386, 1, 4},           {390, 44, 1},          {391, 0, 1},
+    {393, 42, 2},          {395, 0, 1},           {398, 32, 1},
+    {399, 38, 1},          {400, 40, 1},          {401, 0, 1},
+    {403, 42, 1},          {404, 46, 1},          {406, 52, 1},
+    {407, 48, 1},          {408, 0, 1},           {412, 52, 1},
+    {413, 54, 1},          {415, 56, 1},          {416, 1, 6},
+    {422, 60, 1},          {423, 0, 1},           {425, 60, 1},
+    {428, 0, 1},           {430, 60, 1},          {431, 0, 1},
+    {433, 58, 2},          {435, 1, 4},           {439, 62, 1},
+    {440, 0, 1},           {444, 0, 1},           {452, 2, 1},
+    {453, 0, 1},           {455, 2, 1},           {456, 0, 1},
+    {458, 2, 1},           {459, 1, 18},          {478, 1, 18},
+    {497, 2, 1},           {498, 1, 4},           {502, 122, 1},
+    {503, 134, 1},         {504, 1, 40},          {544, 110, 1},
+    {546, 1, 18},          {570, 70, 1},          {571, 0, 1},
+    {573, 108, 1},         {574, 68, 1},          {577, 0, 1},
+    {579, 106, 1},         {580, 28, 1},          {581, 30, 1},
+    {582, 1, 10},          {837, 36, 1},          {880, 1, 4},
+    {886, 0, 1},           {902, 18, 1},          {904, 16, 3},
+    {908, 26, 1},          {910, 24, 2},          {913, 14, 17},
+    {931, 14, 9},          {962, 0, 1},           {975, 4, 1},
+    {976, 140, 1},         {977, 142, 1},         {981, 146, 1},
+    {982, 144, 1},         {984, 1, 24},          {1008, 136, 1},
+    {1009, 138, 1},        {1012, 130, 1},        {1013, 128, 1},
+    {1015, 0, 1},          {1017, 152, 1},        {1018, 0, 1},
+    {1021, 110, 3},        {1024, 34, 16},        {1040, 14, 32},
+    {1120, 1, 34},         {1162, 1, 54},         {1216, 6, 1},
+    {1217, 1, 14},         {1232, 1, 88},         {1329, 22, 38},
+    {4256, 66, 38},        {4295, 66, 1},         {4301, 66, 1},
+    {7680, 1, 150},        {7835, 132, 1},        {7838, 96, 1},
+    {7840, 1, 96},         {7944, 150, 8},        {7960, 150, 6},
+    {7976, 150, 8},        {7992, 150, 8},        {8008, 150, 6},
+    {8025, 151, 8},        {8040, 150, 8},        {8072, 150, 8},
+    {8088, 150, 8},        {8104, 150, 8},        {8120, 150, 2},
+    {8122, 126, 2},        {8124, 148, 1},        {8126, 100, 1},
+    {8136, 124, 4},        {8140, 148, 1},        {8152, 150, 2},
+    {8154, 120, 2},        {8168, 150, 2},        {8170, 118, 2},
+    {8172, 152, 1},        {8184, 112, 2},        {8186, 114, 2},
+    {8188, 148, 1},        {8486, 98, 1},         {8490, 92, 1},
+    {8491, 94, 1},         {8498, 12, 1},         {8544, 8, 16},
+    {8579, 0, 1},          {9398, 10, 26},        {11264, 22, 47},
+    {11360, 0, 1},         {11362, 88, 1},        {11363, 102, 1},
+    {11364, 90, 1},        {11367, 1, 6},         {11373, 84, 1},
+    {11374, 86, 1},        {11375, 80, 1},        {11376, 82, 1},
+    {11378, 0, 1},         {11381, 0, 1},         {11390, 78, 2},
+    {11392, 1, 100},       {11499, 1, 4},         {11506, 0, 1},
+    {42560, 1, 46},        {42624, 1, 24},        {42786, 1, 14},
+    {42802, 1, 62},        {42873, 1, 4},         {42877, 76, 1},
+    {42878, 1, 10},        {42891, 0, 1},         {42893, 74, 1},
+    {42896, 1, 4},         {42912, 1, 10},        {42922, 72, 1},
+    {65313, 14, 26},       
+  };
+  static const unsigned short aiOff[] = {
+   1,     2,     8,     15,    16,    26,    28,    32,    
+   37,    38,    40,    48,    63,    64,    69,    71,    
+   79,    80,    116,   202,   203,   205,   206,   207,   
+   209,   210,   211,   213,   214,   217,   218,   219,   
+   775,   7264,  10792, 10795, 23228, 23256, 30204, 54721, 
+   54753, 54754, 54756, 54787, 54793, 54809, 57153, 57274, 
+   57921, 58019, 58363, 61722, 65268, 65341, 65373, 65406, 
+   65408, 65410, 65415, 65424, 65436, 65439, 65450, 65462, 
+   65472, 65476, 65478, 65480, 65482, 65488, 65506, 65511, 
+   65514, 65521, 65527, 65528, 65529, 
+  };
+
+  int ret = c;
+
+  assert( sizeof(unsigned short)==2 && sizeof(unsigned char)==1 );
+
+  if( c<128 ){
+    if( c>='A' && c<='Z' ) ret = c + ('a' - 'A');
+  }else if( c<65536 ){
+    const struct TableEntry *p;
+    int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
+    int iLo = 0;
+    int iRes = -1;
+
+    assert( c>aEntry[0].iCode );
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      int cmp = (c - aEntry[iTest].iCode);
+      if( cmp>=0 ){
+        iRes = iTest;
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+
+    assert( iRes>=0 && c>=aEntry[iRes].iCode );
+    p = &aEntry[iRes];
+    if( c<(p->iCode + p->nRange) && 0==(0x01 & p->flags & (p->iCode ^ c)) ){
+      ret = (c + (aiOff[p->flags>>1])) & 0x0000FFFF;
+      assert( ret>0 );
+    }
+
+    if( eRemoveDiacritic ){
+      ret = fts5_remove_diacritic(ret, eRemoveDiacritic==2);
+    }
+  }
+  
+  else if( c>=66560 && c<66600 ){
+    ret = c + 40;
+  }
+
+  return ret;
+}
+
+
+static int sqlite3Fts5UnicodeCatParse(const char *zCat, u8 *aArray){ 
+  aArray[0] = 1;
+  switch( zCat[0] ){
+    case 'C':
+          switch( zCat[1] ){
+            case 'c': aArray[1] = 1; break;
+            case 'f': aArray[2] = 1; break;
+            case 'n': aArray[3] = 1; break;
+            case 's': aArray[4] = 1; break;
+            case 'o': aArray[31] = 1; break;
+            case '*': 
+              aArray[1] = 1;
+              aArray[2] = 1;
+              aArray[3] = 1;
+              aArray[4] = 1;
+              aArray[31] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'L':
+          switch( zCat[1] ){
+            case 'l': aArray[5] = 1; break;
+            case 'm': aArray[6] = 1; break;
+            case 'o': aArray[7] = 1; break;
+            case 't': aArray[8] = 1; break;
+            case 'u': aArray[9] = 1; break;
+            case 'C': aArray[30] = 1; break;
+            case '*': 
+              aArray[5] = 1;
+              aArray[6] = 1;
+              aArray[7] = 1;
+              aArray[8] = 1;
+              aArray[9] = 1;
+              aArray[30] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'M':
+          switch( zCat[1] ){
+            case 'c': aArray[10] = 1; break;
+            case 'e': aArray[11] = 1; break;
+            case 'n': aArray[12] = 1; break;
+            case '*': 
+              aArray[10] = 1;
+              aArray[11] = 1;
+              aArray[12] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'N':
+          switch( zCat[1] ){
+            case 'd': aArray[13] = 1; break;
+            case 'l': aArray[14] = 1; break;
+            case 'o': aArray[15] = 1; break;
+            case '*': 
+              aArray[13] = 1;
+              aArray[14] = 1;
+              aArray[15] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'P':
+          switch( zCat[1] ){
+            case 'c': aArray[16] = 1; break;
+            case 'd': aArray[17] = 1; break;
+            case 'e': aArray[18] = 1; break;
+            case 'f': aArray[19] = 1; break;
+            case 'i': aArray[20] = 1; break;
+            case 'o': aArray[21] = 1; break;
+            case 's': aArray[22] = 1; break;
+            case '*': 
+              aArray[16] = 1;
+              aArray[17] = 1;
+              aArray[18] = 1;
+              aArray[19] = 1;
+              aArray[20] = 1;
+              aArray[21] = 1;
+              aArray[22] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'S':
+          switch( zCat[1] ){
+            case 'c': aArray[23] = 1; break;
+            case 'k': aArray[24] = 1; break;
+            case 'm': aArray[25] = 1; break;
+            case 'o': aArray[26] = 1; break;
+            case '*': 
+              aArray[23] = 1;
+              aArray[24] = 1;
+              aArray[25] = 1;
+              aArray[26] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'Z':
+          switch( zCat[1] ){
+            case 'l': aArray[27] = 1; break;
+            case 'p': aArray[28] = 1; break;
+            case 's': aArray[29] = 1; break;
+            case '*': 
+              aArray[27] = 1;
+              aArray[28] = 1;
+              aArray[29] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+  }
+  return 0;
+}
+
+static u16 aFts5UnicodeBlock[] = {
+    0,     1471,  1753,  1760,  1760,  1760,  1760,  1760,  1760,  1760,  
+    1760,  1760,  1760,  1760,  1760,  1763,  1765,  
+  };
+static u16 aFts5UnicodeMap[] = {
+    0,     32,    33,    36,    37,    40,    41,    42,    43,    44,    
+    45,    46,    48,    58,    60,    63,    65,    91,    92,    93,    
+    94,    95,    96,    97,    123,   124,   125,   126,   127,   160,   
+    161,   162,   166,   167,   168,   169,   170,   171,   172,   173,   
+    174,   175,   176,   177,   178,   180,   181,   182,   184,   185,   
+    186,   187,   188,   191,   192,   215,   216,   223,   247,   248,   
+    256,   312,   313,   329,   330,   377,   383,   385,   387,   388,   
+    391,   394,   396,   398,   402,   403,   405,   406,   409,   412,   
+    414,   415,   417,   418,   423,   427,   428,   431,   434,   436,   
+    437,   440,   442,   443,   444,   446,   448,   452,   453,   454,   
+    455,   456,   457,   458,   459,   460,   461,   477,   478,   496,   
+    497,   498,   499,   500,   503,   505,   506,   564,   570,   572,   
+    573,   575,   577,   580,   583,   584,   592,   660,   661,   688,   
+    706,   710,   722,   736,   741,   748,   749,   750,   751,   768,   
+    880,   884,   885,   886,   890,   891,   894,   900,   902,   903,   
+    904,   908,   910,   912,   913,   931,   940,   975,   977,   978,   
+    981,   984,   1008,  1012,  1014,  1015,  1018,  1020,  1021,  1072,  
+    1120,  1154,  1155,  1160,  1162,  1217,  1231,  1232,  1329,  1369,  
+    1370,  1377,  1417,  1418,  1423,  1425,  1470,  1471,  1472,  1473,  
+    1475,  1476,  1478,  1479,  1488,  1520,  1523,  1536,  1542,  1545,  
+    1547,  1548,  1550,  1552,  1563,  1566,  1568,  1600,  1601,  1611,  
+    1632,  1642,  1646,  1648,  1649,  1748,  1749,  1750,  1757,  1758,  
+    1759,  1765,  1767,  1769,  1770,  1774,  1776,  1786,  1789,  1791,  
+    1792,  1807,  1808,  1809,  1810,  1840,  1869,  1958,  1969,  1984,  
+    1994,  2027,  2036,  2038,  2039,  2042,  2048,  2070,  2074,  2075,  
+    2084,  2085,  2088,  2089,  2096,  2112,  2137,  2142,  2208,  2210,  
+    2276,  2304,  2307,  2308,  2362,  2363,  2364,  2365,  2366,  2369,  
+    2377,  2381,  2382,  2384,  2385,  2392,  2402,  2404,  2406,  2416,  
+    2417,  2418,  2425,  2433,  2434,  2437,  2447,  2451,  2474,  2482,  
+    2486,  2492,  2493,  2494,  2497,  2503,  2507,  2509,  2510,  2519,  
+    2524,  2527,  2530,  2534,  2544,  2546,  2548,  2554,  2555,  2561,  
+    2563,  2565,  2575,  2579,  2602,  2610,  2613,  2616,  2620,  2622,  
+    2625,  2631,  2635,  2641,  2649,  2654,  2662,  2672,  2674,  2677,  
+    2689,  2691,  2693,  2703,  2707,  2730,  2738,  2741,  2748,  2749,  
+    2750,  2753,  2759,  2761,  2763,  2765,  2768,  2784,  2786,  2790,  
+    2800,  2801,  2817,  2818,  2821,  2831,  2835,  2858,  2866,  2869,  
+    2876,  2877,  2878,  2879,  2880,  2881,  2887,  2891,  2893,  2902,  
+    2903,  2908,  2911,  2914,  2918,  2928,  2929,  2930,  2946,  2947,  
+    2949,  2958,  2962,  2969,  2972,  2974,  2979,  2984,  2990,  3006,  
+    3008,  3009,  3014,  3018,  3021,  3024,  3031,  3046,  3056,  3059,  
+    3065,  3066,  3073,  3077,  3086,  3090,  3114,  3125,  3133,  3134,  
+    3137,  3142,  3146,  3157,  3160,  3168,  3170,  3174,  3192,  3199,  
+    3202,  3205,  3214,  3218,  3242,  3253,  3260,  3261,  3262,  3263,  
+    3264,  3270,  3271,  3274,  3276,  3285,  3294,  3296,  3298,  3302,  
+    3313,  3330,  3333,  3342,  3346,  3389,  3390,  3393,  3398,  3402,  
+    3405,  3406,  3415,  3424,  3426,  3430,  3440,  3449,  3450,  3458,  
+    3461,  3482,  3507,  3517,  3520,  3530,  3535,  3538,  3542,  3544,  
+    3570,  3572,  3585,  3633,  3634,  3636,  3647,  3648,  3654,  3655,  
+    3663,  3664,  3674,  3713,  3716,  3719,  3722,  3725,  3732,  3737,  
+    3745,  3749,  3751,  3754,  3757,  3761,  3762,  3764,  3771,  3773,  
+    3776,  3782,  3784,  3792,  3804,  3840,  3841,  3844,  3859,  3860,  
+    3861,  3864,  3866,  3872,  3882,  3892,  3893,  3894,  3895,  3896,  
+    3897,  3898,  3899,  3900,  3901,  3902,  3904,  3913,  3953,  3967,  
+    3968,  3973,  3974,  3976,  3981,  3993,  4030,  4038,  4039,  4046,  
+    4048,  4053,  4057,  4096,  4139,  4141,  4145,  4146,  4152,  4153,  
+    4155,  4157,  4159,  4160,  4170,  4176,  4182,  4184,  4186,  4190,  
+    4193,  4194,  4197,  4199,  4206,  4209,  4213,  4226,  4227,  4229,  
+    4231,  4237,  4238,  4239,  4240,  4250,  4253,  4254,  4256,  4295,  
+    4301,  4304,  4347,  4348,  4349,  4682,  4688,  4696,  4698,  4704,  
+    4746,  4752,  4786,  4792,  4800,  4802,  4808,  4824,  4882,  4888,  
+    4957,  4960,  4969,  4992,  5008,  5024,  5120,  5121,  5741,  5743,  
+    5760,  5761,  5787,  5788,  5792,  5867,  5870,  5888,  5902,  5906,  
+    5920,  5938,  5941,  5952,  5970,  5984,  5998,  6002,  6016,  6068,  
+    6070,  6071,  6078,  6086,  6087,  6089,  6100,  6103,  6104,  6107,  
+    6108,  6109,  6112,  6128,  6144,  6150,  6151,  6155,  6158,  6160,  
+    6176,  6211,  6212,  6272,  6313,  6314,  6320,  6400,  6432,  6435,  
+    6439,  6441,  6448,  6450,  6451,  6457,  6464,  6468,  6470,  6480,  
+    6512,  6528,  6576,  6593,  6600,  6608,  6618,  6622,  6656,  6679,  
+    6681,  6686,  6688,  6741,  6742,  6743,  6744,  6752,  6753,  6754,  
+    6755,  6757,  6765,  6771,  6783,  6784,  6800,  6816,  6823,  6824,  
+    6912,  6916,  6917,  6964,  6965,  6966,  6971,  6972,  6973,  6978,  
+    6979,  6981,  6992,  7002,  7009,  7019,  7028,  7040,  7042,  7043,  
+    7073,  7074,  7078,  7080,  7082,  7083,  7084,  7086,  7088,  7098,  
+    7142,  7143,  7144,  7146,  7149,  7150,  7151,  7154,  7164,  7168,  
+    7204,  7212,  7220,  7222,  7227,  7232,  7245,  7248,  7258,  7288,  
+    7294,  7360,  7376,  7379,  7380,  7393,  7394,  7401,  7405,  7406,  
+    7410,  7412,  7413,  7424,  7468,  7531,  7544,  7545,  7579,  7616,  
+    7676,  7680,  7830,  7838,  7936,  7944,  7952,  7960,  7968,  7976,  
+    7984,  7992,  8000,  8008,  8016,  8025,  8027,  8029,  8031,  8033,  
+    8040,  8048,  8064,  8072,  8080,  8088,  8096,  8104,  8112,  8118,  
+    8120,  8124,  8125,  8126,  8127,  8130,  8134,  8136,  8140,  8141,  
+    8144,  8150,  8152,  8157,  8160,  8168,  8173,  8178,  8182,  8184,  
+    8188,  8189,  8192,  8203,  8208,  8214,  8216,  8217,  8218,  8219,  
+    8221,  8222,  8223,  8224,  8232,  8233,  8234,  8239,  8240,  8249,  
+    8250,  8251,  8255,  8257,  8260,  8261,  8262,  8263,  8274,  8275,  
+    8276,  8277,  8287,  8288,  8298,  8304,  8305,  8308,  8314,  8317,  
+    8318,  8319,  8320,  8330,  8333,  8334,  8336,  8352,  8400,  8413,  
+    8417,  8418,  8421,  8448,  8450,  8451,  8455,  8456,  8458,  8459,  
+    8462,  8464,  8467,  8468,  8469,  8470,  8472,  8473,  8478,  8484,  
+    8485,  8486,  8487,  8488,  8489,  8490,  8494,  8495,  8496,  8500,  
+    8501,  8505,  8506,  8508,  8510,  8512,  8517,  8519,  8522,  8523,  
+    8524,  8526,  8527,  8528,  8544,  8579,  8581,  8585,  8592,  8597,  
+    8602,  8604,  8608,  8609,  8611,  8612,  8614,  8615,  8622,  8623,  
+    8654,  8656,  8658,  8659,  8660,  8661,  8692,  8960,  8968,  8972,  
+    8992,  8994,  9001,  9002,  9003,  9084,  9085,  9115,  9140,  9180,  
+    9186,  9216,  9280,  9312,  9372,  9450,  9472,  9655,  9656,  9665,  
+    9666,  9720,  9728,  9839,  9840,  9985,  10088, 10089, 10090, 10091, 
+    10092, 10093, 10094, 10095, 10096, 10097, 10098, 10099, 10100, 10101, 
+    10102, 10132, 10176, 10181, 10182, 10183, 10214, 10215, 10216, 10217, 
+    10218, 10219, 10220, 10221, 10222, 10223, 10224, 10240, 10496, 10627, 
+    10628, 10629, 10630, 10631, 10632, 10633, 10634, 10635, 10636, 10637, 
+    10638, 10639, 10640, 10641, 10642, 10643, 10644, 10645, 10646, 10647, 
+    10648, 10649, 10712, 10713, 10714, 10715, 10716, 10748, 10749, 10750, 
+    11008, 11056, 11077, 11079, 11088, 11264, 11312, 11360, 11363, 11365, 
+    11367, 11374, 11377, 11378, 11380, 11381, 11383, 11388, 11390, 11393, 
+    11394, 11492, 11493, 11499, 11503, 11506, 11513, 11517, 11518, 11520, 
+    11559, 11565, 11568, 11631, 11632, 11647, 11648, 11680, 11688, 11696, 
+    11704, 11712, 11720, 11728, 11736, 11744, 11776, 11778, 11779, 11780, 
+    11781, 11782, 11785, 11786, 11787, 11788, 11789, 11790, 11799, 11800, 
+    11802, 11803, 11804, 11805, 11806, 11808, 11809, 11810, 11811, 11812, 
+    11813, 11814, 11815, 11816, 11817, 11818, 11823, 11824, 11834, 11904, 
+    11931, 12032, 12272, 12288, 12289, 12292, 12293, 12294, 12295, 12296, 
+    12297, 12298, 12299, 12300, 12301, 12302, 12303, 12304, 12305, 12306, 
+    12308, 12309, 12310, 12311, 12312, 12313, 12314, 12315, 12316, 12317, 
+    12318, 12320, 12321, 12330, 12334, 12336, 12337, 12342, 12344, 12347, 
+    12348, 12349, 12350, 12353, 12441, 12443, 12445, 12447, 12448, 12449, 
+    12539, 12540, 12543, 12549, 12593, 12688, 12690, 12694, 12704, 12736, 
+    12784, 12800, 12832, 12842, 12872, 12880, 12881, 12896, 12928, 12938, 
+    12977, 12992, 13056, 13312, 19893, 19904, 19968, 40908, 40960, 40981, 
+    40982, 42128, 42192, 42232, 42238, 42240, 42508, 42509, 42512, 42528, 
+    42538, 42560, 42606, 42607, 42608, 42611, 42612, 42622, 42623, 42624, 
+    42655, 42656, 42726, 42736, 42738, 42752, 42775, 42784, 42786, 42800, 
+    42802, 42864, 42865, 42873, 42878, 42888, 42889, 42891, 42896, 42912, 
+    43000, 43002, 43003, 43010, 43011, 43014, 43015, 43019, 43020, 43043, 
+    43045, 43047, 43048, 43056, 43062, 43064, 43065, 43072, 43124, 43136, 
+    43138, 43188, 43204, 43214, 43216, 43232, 43250, 43256, 43259, 43264, 
+    43274, 43302, 43310, 43312, 43335, 43346, 43359, 43360, 43392, 43395, 
+    43396, 43443, 43444, 43446, 43450, 43452, 43453, 43457, 43471, 43472, 
+    43486, 43520, 43561, 43567, 43569, 43571, 43573, 43584, 43587, 43588, 
+    43596, 43597, 43600, 43612, 43616, 43632, 43633, 43639, 43642, 43643, 
+    43648, 43696, 43697, 43698, 43701, 43703, 43705, 43710, 43712, 43713, 
+    43714, 43739, 43741, 43742, 43744, 43755, 43756, 43758, 43760, 43762, 
+    43763, 43765, 43766, 43777, 43785, 43793, 43808, 43816, 43968, 44003, 
+    44005, 44006, 44008, 44009, 44011, 44012, 44013, 44016, 44032, 55203, 
+    55216, 55243, 55296, 56191, 56319, 57343, 57344, 63743, 63744, 64112, 
+    64256, 64275, 64285, 64286, 64287, 64297, 64298, 64312, 64318, 64320, 
+    64323, 64326, 64434, 64467, 64830, 64831, 64848, 64914, 65008, 65020, 
+    65021, 65024, 65040, 65047, 65048, 65049, 65056, 65072, 65073, 65075, 
+    65077, 65078, 65079, 65080, 65081, 65082, 65083, 65084, 65085, 65086, 
+    65087, 65088, 65089, 65090, 65091, 65092, 65093, 65095, 65096, 65097, 
+    65101, 65104, 65108, 65112, 65113, 65114, 65115, 65116, 65117, 65118, 
+    65119, 65122, 65123, 65124, 65128, 65129, 65130, 65136, 65142, 65279, 
+    65281, 65284, 65285, 65288, 65289, 65290, 65291, 65292, 65293, 65294, 
+    65296, 65306, 65308, 65311, 65313, 65339, 65340, 65341, 65342, 65343, 
+    65344, 65345, 65371, 65372, 65373, 65374, 65375, 65376, 65377, 65378, 
+    65379, 65380, 65382, 65392, 65393, 65438, 65440, 65474, 65482, 65490, 
+    65498, 65504, 65506, 65507, 65508, 65509, 65512, 65513, 65517, 65529, 
+    65532, 0,     13,    40,    60,    63,    80,    128,   256,   263,   
+    311,   320,   373,   377,   394,   400,   464,   509,   640,   672,   
+    768,   800,   816,   833,   834,   842,   896,   927,   928,   968,   
+    976,   977,   1024,  1064,  1104,  1184,  2048,  2056,  2058,  2103,  
+    2108,  2111,  2135,  2136,  2304,  2326,  2335,  2336,  2367,  2432,  
+    2494,  2560,  2561,  2565,  2572,  2576,  2581,  2585,  2616,  2623,  
+    2624,  2640,  2656,  2685,  2687,  2816,  2873,  2880,  2904,  2912,  
+    2936,  3072,  3680,  4096,  4097,  4098,  4099,  4152,  4167,  4178,  
+    4198,  4224,  4226,  4227,  4272,  4275,  4279,  4281,  4283,  4285,  
+    4286,  4304,  4336,  4352,  4355,  4391,  4396,  4397,  4406,  4416,  
+    4480,  4482,  4483,  4531,  4534,  4543,  4545,  4549,  4560,  5760,  
+    5803,  5804,  5805,  5806,  5808,  5814,  5815,  5824,  8192,  9216,  
+    9328,  12288, 26624, 28416, 28496, 28497, 28559, 28563, 45056, 53248, 
+    53504, 53545, 53605, 53607, 53610, 53613, 53619, 53627, 53635, 53637, 
+    53644, 53674, 53678, 53760, 53826, 53829, 54016, 54112, 54272, 54298, 
+    54324, 54350, 54358, 54376, 54402, 54428, 54430, 54434, 54437, 54441, 
+    54446, 54454, 54459, 54461, 54469, 54480, 54506, 54532, 54535, 54541, 
+    54550, 54558, 54584, 54587, 54592, 54598, 54602, 54610, 54636, 54662, 
+    54688, 54714, 54740, 54766, 54792, 54818, 54844, 54870, 54896, 54922, 
+    54952, 54977, 54978, 55003, 55004, 55010, 55035, 55036, 55061, 55062, 
+    55068, 55093, 55094, 55119, 55120, 55126, 55151, 55152, 55177, 55178, 
+    55184, 55209, 55210, 55235, 55236, 55242, 55246, 60928, 60933, 60961, 
+    60964, 60967, 60969, 60980, 60985, 60987, 60994, 60999, 61001, 61003, 
+    61005, 61009, 61012, 61015, 61017, 61019, 61021, 61023, 61025, 61028, 
+    61031, 61036, 61044, 61049, 61054, 61056, 61067, 61089, 61093, 61099, 
+    61168, 61440, 61488, 61600, 61617, 61633, 61649, 61696, 61712, 61744, 
+    61808, 61926, 61968, 62016, 62032, 62208, 62256, 62263, 62336, 62368, 
+    62406, 62432, 62464, 62528, 62530, 62713, 62720, 62784, 62800, 62971, 
+    63045, 63104, 63232, 0,     42710, 42752, 46900, 46912, 47133, 63488, 
+    1,     32,    256,   0,     65533, 
+  };
+static u16 aFts5UnicodeData[] = {
+    1025,  61,    117,   55,    117,   54,    50,    53,    57,    53,    
+    49,    85,    333,   85,    121,   85,    841,   54,    53,    50,    
+    56,    48,    56,    837,   54,    57,    50,    57,    1057,  61,    
+    53,    151,   58,    53,    56,    58,    39,    52,    57,    34,    
+    58,    56,    58,    57,    79,    56,    37,    85,    56,    47,    
+    39,    51,    111,   53,    745,   57,    233,   773,   57,    261,   
+    1822,  37,    542,   37,    1534,  222,   69,    73,    37,    126,   
+    126,   73,    69,    137,   37,    73,    37,    105,   101,   73,    
+    37,    73,    37,    190,   158,   37,    126,   126,   73,    37,    
+    126,   94,    37,    39,    94,    69,    135,   41,    40,    37,    
+    41,    40,    37,    41,    40,    37,    542,   37,    606,   37,    
+    41,    40,    37,    126,   73,    37,    1886,  197,   73,    37,    
+    73,    69,    126,   105,   37,    286,   2181,  39,    869,   582,   
+    152,   390,   472,   166,   248,   38,    56,    38,    568,   3596,  
+    158,   38,    56,    94,    38,    101,   53,    88,    41,    53,    
+    105,   41,    73,    37,    553,   297,   1125,  94,    37,    105,   
+    101,   798,   133,   94,    57,    126,   94,    37,    1641,  1541,  
+    1118,  58,    172,   75,    1790,  478,   37,    2846,  1225,  38,    
+    213,   1253,  53,    49,    55,    1452,  49,    44,    53,    76,    
+    53,    76,    53,    44,    871,   103,   85,    162,   121,   85,    
+    55,    85,    90,    364,   53,    85,    1031,  38,    327,   684,   
+    333,   149,   71,    44,    3175,  53,    39,    236,   34,    58,    
+    204,   70,    76,    58,    140,   71,    333,   103,   90,    39,    
+    469,   34,    39,    44,    967,   876,   2855,  364,   39,    333,   
+    1063,  300,   70,    58,    117,   38,    711,   140,   38,    300,   
+    38,    108,   38,    172,   501,   807,   108,   53,    39,    359,   
+    876,   108,   42,    1735,  44,    42,    44,    39,    106,   268,   
+    138,   44,    74,    39,    236,   327,   76,    85,    333,   53,    
+    38,    199,   231,   44,    74,    263,   71,    711,   231,   39,    
+    135,   44,    39,    106,   140,   74,    74,    44,    39,    42,    
+    71,    103,   76,    333,   71,    87,    207,   58,    55,    76,    
+    42,    199,   71,    711,   231,   71,    71,    71,    44,    106,   
+    76,    76,    108,   44,    135,   39,    333,   76,    103,   44,    
+    76,    42,    295,   103,   711,   231,   71,    167,   44,    39,    
+    106,   172,   76,    42,    74,    44,    39,    71,    76,    333,   
+    53,    55,    44,    74,    263,   71,    711,   231,   71,    167,   
+    44,    39,    42,    44,    42,    140,   74,    74,    44,    44,    
+    42,    71,    103,   76,    333,   58,    39,    207,   44,    39,    
+    199,   103,   135,   71,    39,    71,    71,    103,   391,   74,    
+    44,    74,    106,   106,   44,    39,    42,    333,   111,   218,   
+    55,    58,    106,   263,   103,   743,   327,   167,   39,    108,   
+    138,   108,   140,   76,    71,    71,    76,    333,   239,   58,    
+    74,    263,   103,   743,   327,   167,   44,    39,    42,    44,    
+    170,   44,    74,    74,    76,    74,    39,    71,    76,    333,   
+    71,    74,    263,   103,   1319,  39,    106,   140,   106,   106,   
+    44,    39,    42,    71,    76,    333,   207,   58,    199,   74,    
+    583,   775,   295,   39,    231,   44,    106,   108,   44,    266,   
+    74,    53,    1543,  44,    71,    236,   55,    199,   38,    268,   
+    53,    333,   85,    71,    39,    71,    39,    39,    135,   231,   
+    103,   39,    39,    71,    135,   44,    71,    204,   76,    39,    
+    167,   38,    204,   333,   135,   39,    122,   501,   58,    53,    
+    122,   76,    218,   333,   335,   58,    44,    58,    44,    58,    
+    44,    54,    50,    54,    50,    74,    263,   1159,  460,   42,    
+    172,   53,    76,    167,   364,   1164,  282,   44,    218,   90,    
+    181,   154,   85,    1383,  74,    140,   42,    204,   42,    76,    
+    74,    76,    39,    333,   213,   199,   74,    76,    135,   108,   
+    39,    106,   71,    234,   103,   140,   423,   44,    74,    76,    
+    202,   44,    39,    42,    333,   106,   44,    90,    1225,  41,    
+    41,    1383,  53,    38,    10631, 135,   231,   39,    135,   1319,  
+    135,   1063,  135,   231,   39,    135,   487,   1831,  135,   2151,  
+    108,   309,   655,   519,   346,   2727,  49,    19847, 85,    551,   
+    61,    839,   54,    50,    2407,  117,   110,   423,   135,   108,   
+    583,   108,   85,    583,   76,    423,   103,   76,    1671,  76,    
+    42,    236,   266,   44,    74,    364,   117,   38,    117,   55,    
+    39,    44,    333,   335,   213,   49,    149,   108,   61,    333,   
+    1127,  38,    1671,  1319,  44,    39,    2247,  935,   108,   138,   
+    76,    106,   74,    44,    202,   108,   58,    85,    333,   967,   
+    167,   1415,  554,   231,   74,    333,   47,    1114,  743,   76,    
+    106,   85,    1703,  42,    44,    42,    236,   44,    42,    44,    
+    74,    268,   202,   332,   44,    333,   333,   245,   38,    213,   
+    140,   42,    1511,  44,    42,    172,   42,    44,    170,   44,    
+    74,    231,   333,   245,   346,   300,   314,   76,    42,    967,   
+    42,    140,   74,    76,    42,    44,    74,    71,    333,   1415,  
+    44,    42,    76,    106,   44,    42,    108,   74,    149,   1159,  
+    266,   268,   74,    76,    181,   333,   103,   333,   967,   198,   
+    85,    277,   108,   53,    428,   42,    236,   135,   44,    135,   
+    74,    44,    71,    1413,  2022,  421,   38,    1093,  1190,  1260,  
+    140,   4830,  261,   3166,  261,   265,   197,   201,   261,   265,   
+    261,   265,   197,   201,   261,   41,    41,    41,    94,    229,   
+    265,   453,   261,   264,   261,   264,   261,   264,   165,   69,    
+    137,   40,    56,    37,    120,   101,   69,    137,   40,    120,   
+    133,   69,    137,   120,   261,   169,   120,   101,   69,    137,   
+    40,    88,    381,   162,   209,   85,    52,    51,    54,    84,    
+    51,    54,    52,    277,   59,    60,    162,   61,    309,   52,    
+    51,    149,   80,    117,   57,    54,    50,    373,   57,    53,    
+    48,    341,   61,    162,   194,   47,    38,    207,   121,   54,    
+    50,    38,    335,   121,   54,    50,    422,   855,   428,   139,   
+    44,    107,   396,   90,    41,    154,   41,    90,    37,    105,   
+    69,    105,   37,    58,    41,    90,    57,    169,   218,   41,    
+    58,    41,    58,    41,    58,    137,   58,    37,    137,   37,    
+    135,   37,    90,    69,    73,    185,   94,    101,   58,    57,    
+    90,    37,    58,    527,   1134,  94,    142,   47,    185,   186,   
+    89,    154,   57,    90,    57,    90,    57,    250,   57,    1018,  
+    89,    90,    57,    58,    57,    1018,  8601,  282,   153,   666,   
+    89,    250,   54,    50,    2618,  57,    986,   825,   1306,  217,   
+    602,   1274,  378,   1935,  2522,  719,   5882,  57,    314,   57,    
+    1754,  281,   3578,  57,    4634,  3322,  54,    50,    54,    50,    
+    54,    50,    54,    50,    54,    50,    54,    50,    54,    50,    
+    975,   1434,  185,   54,    50,    1017,  54,    50,    54,    50,    
+    54,    50,    54,    50,    54,    50,    537,   8218,  4217,  54,    
+    50,    54,    50,    54,    50,    54,    50,    54,    50,    54,    
+    50,    54,    50,    54,    50,    54,    50,    54,    50,    54,    
+    50,    2041,  54,    50,    54,    50,    1049,  54,    50,    8281,  
+    1562,  697,   90,    217,   346,   1513,  1509,  126,   73,    69,    
+    254,   105,   37,    94,    37,    94,    165,   70,    105,   37,    
+    3166,  37,    218,   158,   108,   94,    149,   47,    85,    1221,  
+    37,    37,    1799,  38,    53,    44,    743,   231,   231,   231,   
+    231,   231,   231,   231,   231,   1036,  85,    52,    51,    52,    
+    51,    117,   52,    51,    53,    52,    51,    309,   49,    85,    
+    49,    53,    52,    51,    85,    52,    51,    54,    50,    54,    
+    50,    54,    50,    54,    50,    181,   38,    341,   81,    858,   
+    2874,  6874,  410,   61,    117,   58,    38,    39,    46,    54,    
+    50,    54,    50,    54,    50,    54,    50,    54,    50,    90,    
+    54,    50,    54,    50,    54,    50,    54,    50,    49,    54,    
+    82,    58,    302,   140,   74,    49,    166,   90,    110,   38,    
+    39,    53,    90,    2759,  76,    88,    70,    39,    49,    2887,  
+    53,    102,   39,    1319,  3015,  90,    143,   346,   871,   1178,  
+    519,   1018,  335,   986,   271,   58,    495,   1050,  335,   1274,  
+    495,   2042,  8218,  39,    39,    2074,  39,    39,    679,   38,    
+    36583, 1786,  1287,  198,   85,    8583,  38,    117,   519,   333,   
+    71,    1502,  39,    44,    107,   53,    332,   53,    38,    798,   
+    44,    2247,  334,   76,    213,   760,   294,   88,    478,   69,    
+    2014,  38,    261,   190,   350,   38,    88,    158,   158,   382,   
+    70,    37,    231,   44,    103,   44,    135,   44,    743,   74,    
+    76,    42,    154,   207,   90,    55,    58,    1671,  149,   74,    
+    1607,  522,   44,    85,    333,   588,   199,   117,   39,    333,   
+    903,   268,   85,    743,   364,   74,    53,    935,   108,   42,    
+    1511,  44,    74,    140,   74,    44,    138,   437,   38,    333,   
+    85,    1319,  204,   74,    76,    74,    76,    103,   44,    263,   
+    44,    42,    333,   149,   519,   38,    199,   122,   39,    42,    
+    1543,  44,    39,    108,   71,    76,    167,   76,    39,    44,    
+    39,    71,    38,    85,    359,   42,    76,    74,    85,    39,    
+    70,    42,    44,    199,   199,   199,   231,   231,   1127,  74,    
+    44,    74,    44,    74,    53,    42,    44,    333,   39,    39,    
+    743,   1575,  36,    68,    68,    36,    63,    63,    11719, 3399,  
+    229,   165,   39,    44,    327,   57,    423,   167,   39,    71,    
+    71,    3463,  536,   11623, 54,    50,    2055,  1735,  391,   55,    
+    58,    524,   245,   54,    50,    53,    236,   53,    81,    80,    
+    54,    50,    54,    50,    54,    50,    54,    50,    54,    50,    
+    54,    50,    54,    50,    54,    50,    85,    54,    50,    149,   
+    112,   117,   149,   49,    54,    50,    54,    50,    54,    50,    
+    117,   57,    49,    121,   53,    55,    85,    167,   4327,  34,    
+    117,   55,    117,   54,    50,    53,    57,    53,    49,    85,    
+    333,   85,    121,   85,    841,   54,    53,    50,    56,    48,    
+    56,    837,   54,    57,    50,    57,    54,    50,    53,    54,    
+    50,    85,    327,   38,    1447,  70,    999,   199,   199,   199,   
+    103,   87,    57,    56,    58,    87,    58,    153,   90,    98,    
+    90,    391,   839,   615,   71,    487,   455,   3943,  117,   1455,  
+    314,   1710,  143,   570,   47,    410,   1466,  44,    935,   1575,  
+    999,   143,   551,   46,    263,   46,    967,   53,    1159,  263,   
+    53,    174,   1289,  1285,  2503,  333,   199,   39,    1415,  71,    
+    39,    743,   53,    271,   711,   207,   53,    839,   53,    1799,  
+    71,    39,    108,   76,    140,   135,   103,   871,   108,   44,    
+    271,   309,   935,   79,    53,    1735,  245,   711,   271,   615,   
+    271,   2343,  1007,  42,    44,    42,    1703,  492,   245,   655,   
+    333,   76,    42,    1447,  106,   140,   74,    76,    85,    34,    
+    149,   807,   333,   108,   1159,  172,   42,    268,   333,   149,   
+    76,    42,    1543,  106,   300,   74,    135,   149,   333,   1383,  
+    44,    42,    44,    74,    204,   42,    44,    333,   28135, 3182,  
+    149,   34279, 18215, 2215,  39,    1482,  140,   422,   71,    7898,  
+    1274,  1946,  74,    108,   122,   202,   258,   268,   90,    236,   
+    986,   140,   1562,  2138,  108,   58,    2810,  591,   841,   837,   
+    841,   229,   581,   841,   837,   41,    73,    41,    73,    137,   
+    265,   133,   37,    229,   357,   841,   837,   73,    137,   265,   
+    233,   837,   73,    137,   169,   41,    233,   837,   841,   837,   
+    841,   837,   841,   837,   841,   837,   841,   837,   841,   901,   
+    809,   57,    805,   57,    197,   809,   57,    805,   57,    197,   
+    809,   57,    805,   57,    197,   809,   57,    805,   57,    197,   
+    809,   57,    805,   57,    197,   94,    1613,  135,   871,   71,    
+    39,    39,    327,   135,   39,    39,    39,    39,    39,    39,    
+    103,   71,    39,    39,    39,    39,    39,    39,    71,    39,    
+    135,   231,   135,   135,   39,    327,   551,   103,   167,   551,   
+    89,    1434,  3226,  506,   474,   506,   506,   367,   1018,  1946,  
+    1402,  954,   1402,  314,   90,    1082,  218,   2266,  666,   1210,  
+    186,   570,   2042,  58,    5850,  154,   2010,  154,   794,   2266,  
+    378,   2266,  3738,  39,    39,    39,    39,    39,    39,    17351, 
+    34,    3074,  7692,  63,    63,    
+  };
+
+static int sqlite3Fts5UnicodeCategory(u32 iCode) { 
+  int iRes = -1;
+  int iHi;
+  int iLo;
+  int ret;
+  u16 iKey;
+
+  if( iCode>=(1<<20) ){
+    return 0;
+  }
+  iLo = aFts5UnicodeBlock[(iCode>>16)];
+  iHi = aFts5UnicodeBlock[1+(iCode>>16)];
+  iKey = (iCode & 0xFFFF);
+  while( iHi>iLo ){
+    int iTest = (iHi + iLo) / 2;
+    assert( iTest>=iLo && iTest<iHi );
+    if( iKey>=aFts5UnicodeMap[iTest] ){
+      iRes = iTest;
+      iLo = iTest+1;
+    }else{
+      iHi = iTest;
+    }
+  }
+
+  if( iRes<0 ) return 0;
+  if( iKey>=(aFts5UnicodeMap[iRes]+(aFts5UnicodeData[iRes]>>5)) ) return 0;
+  ret = aFts5UnicodeData[iRes] & 0x1F;
+  if( ret!=30 ) return ret;
+  return ((iKey - aFts5UnicodeMap[iRes]) & 0x01) ? 5 : 9;
+}
+
+static void sqlite3Fts5UnicodeAscii(u8 *aArray, u8 *aAscii){
+  int i = 0;
+  int iTbl = 0;
+  while( i<128 ){
+    int bToken = aArray[ aFts5UnicodeData[iTbl] & 0x1F ];
+    int n = (aFts5UnicodeData[iTbl] >> 5) + i;
+    for(; i<128 && i<n; i++){
+      aAscii[i] = (u8)bToken;
+    }
+    iTbl++;
+  }
+  aAscii[0] = 0;                  /* 0x00 is never a token character */
+}
+
+
+#line 1 "fts5_varint.c"
+/*
+** 2015 May 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Routines for varint serialization and deserialization.
+*/
+
+
+/* #include "fts5Int.h" */
+
+/*
+** This is a copy of the sqlite3GetVarint32() routine from the SQLite core.
+** Except, this version does handle the single byte case that the core
+** version depends on being handled before its function is called.
+*/
+static int sqlite3Fts5GetVarint32(const unsigned char *p, u32 *v){
+  u32 a,b;
+
+  /* The 1-byte case. Overwhelmingly the most common. */
+  a = *p;
+  /* a: p0 (unmasked) */
+  if (!(a&0x80))
+  {
+    /* Values between 0 and 127 */
+    *v = a;
+    return 1;
+  }
+
+  /* The 2-byte case */
+  p++;
+  b = *p;
+  /* b: p1 (unmasked) */
+  if (!(b&0x80))
+  {
+    /* Values between 128 and 16383 */
+    a &= 0x7f;
+    a = a<<7;
+    *v = a | b;
+    return 2;
+  }
+
+  /* The 3-byte case */
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p0<<14 | p2 (unmasked) */
+  if (!(a&0x80))
+  {
+    /* Values between 16384 and 2097151 */
+    a &= (0x7f<<14)|(0x7f);
+    b &= 0x7f;
+    b = b<<7;
+    *v = a | b;
+    return 3;
+  }
+
+  /* A 32-bit varint is used to store size information in btrees.
+  ** Objects are rarely larger than 2MiB limit of a 3-byte varint.
+  ** A 3-byte varint is sufficient, for example, to record the size
+  ** of a 1048569-byte BLOB or string.
+  **
+  ** We only unroll the first 1-, 2-, and 3- byte cases.  The very
+  ** rare larger cases can be handled by the slower 64-bit varint
+  ** routine.
+  */
+  {
+    u64 v64;
+    u8 n;
+    p -= 2;
+    n = sqlite3Fts5GetVarint(p, &v64);
+    *v = ((u32)v64) & 0x7FFFFFFF;
+    assert( n>3 && n<=9 );
+    return n;
+  }
+}
+
+
+/*
+** Bitmasks used by sqlite3GetVarint().  These precomputed constants
+** are defined here rather than simply putting the constant expressions
+** inline in order to work around bugs in the RVT compiler.
+**
+** SLOT_2_0     A mask for  (0x7f<<14) | 0x7f
+**
+** SLOT_4_2_0   A mask for  (0x7f<<28) | SLOT_2_0
+*/
+#define SLOT_2_0     0x001fc07f
+#define SLOT_4_2_0   0xf01fc07f
+
+/*
+** Read a 64-bit variable-length integer from memory starting at p[0].
+** Return the number of bytes read.  The value is stored in *v.
+*/
+static u8 sqlite3Fts5GetVarint(const unsigned char *p, u64 *v){
+  u32 a,b,s;
+
+  a = *p;
+  /* a: p0 (unmasked) */
+  if (!(a&0x80))
+  {
+    *v = a;
+    return 1;
+  }
+
+  p++;
+  b = *p;
+  /* b: p1 (unmasked) */
+  if (!(b&0x80))
+  {
+    a &= 0x7f;
+    a = a<<7;
+    a |= b;
+    *v = a;
+    return 2;
+  }
+
+  /* Verify that constants are precomputed correctly */
+  assert( SLOT_2_0 == ((0x7f<<14) | (0x7f)) );
+  assert( SLOT_4_2_0 == ((0xfU<<28) | (0x7f<<14) | (0x7f)) );
+
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p0<<14 | p2 (unmasked) */
+  if (!(a&0x80))
+  {
+    a &= SLOT_2_0;
+    b &= 0x7f;
+    b = b<<7;
+    a |= b;
+    *v = a;
+    return 3;
+  }
+
+  /* CSE1 from below */
+  a &= SLOT_2_0;
+  p++;
+  b = b<<14;
+  b |= *p;
+  /* b: p1<<14 | p3 (unmasked) */
+  if (!(b&0x80))
+  {
+    b &= SLOT_2_0;
+    /* moved CSE1 up */
+    /* a &= (0x7f<<14)|(0x7f); */
+    a = a<<7;
+    a |= b;
+    *v = a;
+    return 4;
+  }
+
+  /* a: p0<<14 | p2 (masked) */
+  /* b: p1<<14 | p3 (unmasked) */
+  /* 1:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
+  /* moved CSE1 up */
+  /* a &= (0x7f<<14)|(0x7f); */
+  b &= SLOT_2_0;
+  s = a;
+  /* s: p0<<14 | p2 (masked) */
+
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p0<<28 | p2<<14 | p4 (unmasked) */
+  if (!(a&0x80))
+  {
+    /* we can skip these cause they were (effectively) done above in calc'ing s */
+    /* a &= (0x7f<<28)|(0x7f<<14)|(0x7f); */
+    /* b &= (0x7f<<14)|(0x7f); */
+    b = b<<7;
+    a |= b;
+    s = s>>18;
+    *v = ((u64)s)<<32 | a;
+    return 5;
+  }
+
+  /* 2:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
+  s = s<<7;
+  s |= b;
+  /* s: p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
+
+  p++;
+  b = b<<14;
+  b |= *p;
+  /* b: p1<<28 | p3<<14 | p5 (unmasked) */
+  if (!(b&0x80))
+  {
+    /* we can skip this cause it was (effectively) done above in calc'ing s */
+    /* b &= (0x7f<<28)|(0x7f<<14)|(0x7f); */
+    a &= SLOT_2_0;
+    a = a<<7;
+    a |= b;
+    s = s>>18;
+    *v = ((u64)s)<<32 | a;
+    return 6;
+  }
+
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p2<<28 | p4<<14 | p6 (unmasked) */
+  if (!(a&0x80))
+  {
+    a &= SLOT_4_2_0;
+    b &= SLOT_2_0;
+    b = b<<7;
+    a |= b;
+    s = s>>11;
+    *v = ((u64)s)<<32 | a;
+    return 7;
+  }
+
+  /* CSE2 from below */
+  a &= SLOT_2_0;
+  p++;
+  b = b<<14;
+  b |= *p;
+  /* b: p3<<28 | p5<<14 | p7 (unmasked) */
+  if (!(b&0x80))
+  {
+    b &= SLOT_4_2_0;
+    /* moved CSE2 up */
+    /* a &= (0x7f<<14)|(0x7f); */
+    a = a<<7;
+    a |= b;
+    s = s>>4;
+    *v = ((u64)s)<<32 | a;
+    return 8;
+  }
+
+  p++;
+  a = a<<15;
+  a |= *p;
+  /* a: p4<<29 | p6<<15 | p8 (unmasked) */
+
+  /* moved CSE2 up */
+  /* a &= (0x7f<<29)|(0x7f<<15)|(0xff); */
+  b &= SLOT_2_0;
+  b = b<<8;
+  a |= b;
+
+  s = s<<4;
+  b = p[-4];
+  b &= 0x7f;
+  b = b>>3;
+  s |= b;
+
+  *v = ((u64)s)<<32 | a;
+
+  return 9;
+}
+
+/*
+** The variable-length integer encoding is as follows:
+**
+** KEY:
+**         A = 0xxxxxxx    7 bits of data and one flag bit
+**         B = 1xxxxxxx    7 bits of data and one flag bit
+**         C = xxxxxxxx    8 bits of data
+**
+**  7 bits - A
+** 14 bits - BA
+** 21 bits - BBA
+** 28 bits - BBBA
+** 35 bits - BBBBA
+** 42 bits - BBBBBA
+** 49 bits - BBBBBBA
+** 56 bits - BBBBBBBA
+** 64 bits - BBBBBBBBC
+*/
+
+#ifdef SQLITE_NOINLINE
+# define FTS5_NOINLINE SQLITE_NOINLINE
+#else
+# define FTS5_NOINLINE
+#endif
+
+/*
+** Write a 64-bit variable-length integer to memory starting at p[0].
+** The length of data write will be between 1 and 9 bytes.  The number
+** of bytes written is returned.
+**
+** A variable-length integer consists of the lower 7 bits of each byte
+** for all bytes that have the 8th bit set and one byte with the 8th
+** bit clear.  Except, if we get to the 9th byte, it stores the full
+** 8 bits and is the last byte.
+*/
+static int FTS5_NOINLINE fts5PutVarint64(unsigned char *p, u64 v){
+  int i, j, n;
+  u8 buf[10];
+  if( v & (((u64)0xff000000)<<32) ){
+    p[8] = (u8)v;
+    v >>= 8;
+    for(i=7; i>=0; i--){
+      p[i] = (u8)((v & 0x7f) | 0x80);
+      v >>= 7;
+    }
+    return 9;
+  }    
+  n = 0;
+  do{
+    buf[n++] = (u8)((v & 0x7f) | 0x80);
+    v >>= 7;
+  }while( v!=0 );
+  buf[0] &= 0x7f;
+  assert( n<=9 );
+  for(i=0, j=n-1; j>=0; j--, i++){
+    p[i] = buf[j];
+  }
+  return n;
+}
+
+static int sqlite3Fts5PutVarint(unsigned char *p, u64 v){
+  if( v<=0x7f ){
+    p[0] = v&0x7f;
+    return 1;
+  }
+  if( v<=0x3fff ){
+    p[0] = ((v>>7)&0x7f)|0x80;
+    p[1] = v&0x7f;
+    return 2;
+  }
+  return fts5PutVarint64(p,v);
+}
+
+
+static int sqlite3Fts5GetVarintLen(u32 iVal){
+#if 0
+  if( iVal<(1 << 7 ) ) return 1;
+#endif
+  assert( iVal>=(1 << 7) );
+  if( iVal<(1 << 14) ) return 2;
+  if( iVal<(1 << 21) ) return 3;
+  if( iVal<(1 << 28) ) return 4;
+  return 5;
+}
+
+#line 1 "fts5_vocab.c"
+/*
+** 2015 May 08
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This is an SQLite virtual table module implementing direct access to an
+** existing FTS5 index. The module may create several different types of 
+** tables:
+**
+** col:
+**     CREATE TABLE vocab(term, col, doc, cnt, PRIMARY KEY(term, col));
+**
+**   One row for each term/column combination. The value of $doc is set to
+**   the number of fts5 rows that contain at least one instance of term
+**   $term within column $col. Field $cnt is set to the total number of 
+**   instances of term $term in column $col (in any row of the fts5 table). 
+**
+** row:
+**     CREATE TABLE vocab(term, doc, cnt, PRIMARY KEY(term));
+**
+**   One row for each term in the database. The value of $doc is set to
+**   the number of fts5 rows that contain at least one instance of term
+**   $term. Field $cnt is set to the total number of instances of term 
+**   $term in the database.
+**
+** instance:
+**     CREATE TABLE vocab(term, doc, col, offset, PRIMARY KEY(<all-fields>));
+**
+**   One row for each term instance in the database. 
+*/
+
+
+/* #include "fts5Int.h" */
+
+
+typedef struct Fts5VocabTable Fts5VocabTable;
+typedef struct Fts5VocabCursor Fts5VocabCursor;
+
+struct Fts5VocabTable {
+  sqlite3_vtab base;
+  char *zFts5Tbl;                 /* Name of fts5 table */
+  char *zFts5Db;                  /* Db containing fts5 table */
+  sqlite3 *db;                    /* Database handle */
+  Fts5Global *pGlobal;            /* FTS5 global object for this database */
+  int eType;                      /* FTS5_VOCAB_COL, ROW or INSTANCE */
+  unsigned bBusy;                 /* True if busy */
+};
+
+struct Fts5VocabCursor {
+  sqlite3_vtab_cursor base;
+  sqlite3_stmt *pStmt;            /* Statement holding lock on pIndex */
+  Fts5Table *pFts5;               /* Associated FTS5 table */
+
+  int bEof;                       /* True if this cursor is at EOF */
+  Fts5IndexIter *pIter;           /* Term/rowid iterator object */
+  void *pStruct;                  /* From sqlite3Fts5StructureRef() */
+
+  int nLeTerm;                    /* Size of zLeTerm in bytes */
+  char *zLeTerm;                  /* (term <= $zLeTerm) paramater, or NULL */
+
+  /* These are used by 'col' tables only */
+  int iCol;
+  i64 *aCnt;
+  i64 *aDoc;
+
+  /* Output values used by all tables. */
+  i64 rowid;                      /* This table's current rowid value */
+  Fts5Buffer term;                /* Current value of 'term' column */
+
+  /* Output values Used by 'instance' tables only */
+  i64 iInstPos;
+  int iInstOff;
+};
+
+#define FTS5_VOCAB_COL      0
+#define FTS5_VOCAB_ROW      1
+#define FTS5_VOCAB_INSTANCE 2
+
+#define FTS5_VOCAB_COL_SCHEMA  "term, col, doc, cnt"
+#define FTS5_VOCAB_ROW_SCHEMA  "term, doc, cnt"
+#define FTS5_VOCAB_INST_SCHEMA "term, doc, col, offset"
+
+/*
+** Bits for the mask used as the idxNum value by xBestIndex/xFilter.
+*/
+#define FTS5_VOCAB_TERM_EQ 0x01
+#define FTS5_VOCAB_TERM_GE 0x02
+#define FTS5_VOCAB_TERM_LE 0x04
+
+
+/*
+** Translate a string containing an fts5vocab table type to an 
+** FTS5_VOCAB_XXX constant. If successful, set *peType to the output
+** value and return SQLITE_OK. Otherwise, set *pzErr to an error message
+** and return SQLITE_ERROR.
+*/
+static int fts5VocabTableType(const char *zType, char **pzErr, int *peType){
+  int rc = SQLITE_OK;
+  char *zCopy = sqlite3Fts5Strndup(&rc, zType, -1);
+  if( rc==SQLITE_OK ){
+    sqlite3Fts5Dequote(zCopy);
+    if( sqlite3_stricmp(zCopy, "col")==0 ){
+      *peType = FTS5_VOCAB_COL;
+    }else
+
+    if( sqlite3_stricmp(zCopy, "row")==0 ){
+      *peType = FTS5_VOCAB_ROW;
+    }else
+    if( sqlite3_stricmp(zCopy, "instance")==0 ){
+      *peType = FTS5_VOCAB_INSTANCE;
+    }else
+    {
+      *pzErr = sqlite3_mprintf("fts5vocab: unknown table type: %Q", zCopy);
+      rc = SQLITE_ERROR;
+    }
+    sqlite3_free(zCopy);
+  }
+
+  return rc;
+}
+
+
+/*
+** The xDisconnect() virtual table method.
+*/
+static int fts5VocabDisconnectMethod(sqlite3_vtab *pVtab){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pVtab;
+  sqlite3_free(pTab);
+  return SQLITE_OK;
+}
+
+/*
+** The xDestroy() virtual table method.
+*/
+static int fts5VocabDestroyMethod(sqlite3_vtab *pVtab){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pVtab;
+  sqlite3_free(pTab);
+  return SQLITE_OK;
+}
+
+/*
+** This function is the implementation of both the xConnect and xCreate
+** methods of the FTS3 virtual table.
+**
+** The argv[] array contains the following:
+**
+**   argv[0]   -> module name  ("fts5vocab")
+**   argv[1]   -> database name
+**   argv[2]   -> table name
+**
+** then:
+**
+**   argv[3]   -> name of fts5 table
+**   argv[4]   -> type of fts5vocab table
+**
+** or, for tables in the TEMP schema only.
+**
+**   argv[3]   -> name of fts5 tables database
+**   argv[4]   -> name of fts5 table
+**   argv[5]   -> type of fts5vocab table
+*/
+static int fts5VocabInitVtab(
+  sqlite3 *db,                    /* The SQLite database connection */
+  void *pAux,                     /* Pointer to Fts5Global object */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVTab,          /* Write the resulting vtab structure here */
+  char **pzErr                    /* Write any error message here */
+){
+  const char *azSchema[] = { 
+    "CREATE TABlE vocab(" FTS5_VOCAB_COL_SCHEMA  ")", 
+    "CREATE TABlE vocab(" FTS5_VOCAB_ROW_SCHEMA  ")",
+    "CREATE TABlE vocab(" FTS5_VOCAB_INST_SCHEMA ")"
+  };
+
+  Fts5VocabTable *pRet = 0;
+  int rc = SQLITE_OK;             /* Return code */
+  int bDb;
+
+  bDb = (argc==6 && strlen(argv[1])==4 && memcmp("temp", argv[1], 4)==0);
+
+  if( argc!=5 && bDb==0 ){
+    *pzErr = sqlite3_mprintf("wrong number of vtable arguments");
+    rc = SQLITE_ERROR;
+  }else{
+    int nByte;                      /* Bytes of space to allocate */
+    const char *zDb = bDb ? argv[3] : argv[1];
+    const char *zTab = bDb ? argv[4] : argv[3];
+    const char *zType = bDb ? argv[5] : argv[4];
+    int nDb = (int)strlen(zDb)+1; 
+    int nTab = (int)strlen(zTab)+1;
+    int eType = 0;
+    
+    rc = fts5VocabTableType(zType, pzErr, &eType);
+    if( rc==SQLITE_OK ){
+      assert( eType>=0 && eType<ArraySize(azSchema) );
+      rc = sqlite3_declare_vtab(db, azSchema[eType]);
+    }
+
+    nByte = sizeof(Fts5VocabTable) + nDb + nTab;
+    pRet = sqlite3Fts5MallocZero(&rc, nByte);
+    if( pRet ){
+      pRet->pGlobal = (Fts5Global*)pAux;
+      pRet->eType = eType;
+      pRet->db = db;
+      pRet->zFts5Tbl = (char*)&pRet[1];
+      pRet->zFts5Db = &pRet->zFts5Tbl[nTab];
+      memcpy(pRet->zFts5Tbl, zTab, nTab);
+      memcpy(pRet->zFts5Db, zDb, nDb);
+      sqlite3Fts5Dequote(pRet->zFts5Tbl);
+      sqlite3Fts5Dequote(pRet->zFts5Db);
+    }
+  }
+
+  *ppVTab = (sqlite3_vtab*)pRet;
+  return rc;
+}
+
+
+/*
+** The xConnect() and xCreate() methods for the virtual table. All the
+** work is done in function fts5VocabInitVtab().
+*/
+static int fts5VocabConnectMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5VocabInitVtab(db, pAux, argc, argv, ppVtab, pzErr);
+}
+static int fts5VocabCreateMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5VocabInitVtab(db, pAux, argc, argv, ppVtab, pzErr);
+}
+
+/* 
+** Implementation of the xBestIndex method.
+**
+** Only constraints of the form:
+**
+**     term <= ?
+**     term == ?
+**     term >= ?
+**
+** are interpreted. Less-than and less-than-or-equal are treated 
+** identically, as are greater-than and greater-than-or-equal.
+*/
+static int fts5VocabBestIndexMethod(
+  sqlite3_vtab *pUnused,
+  sqlite3_index_info *pInfo
+){
+  int i;
+  int iTermEq = -1;
+  int iTermGe = -1;
+  int iTermLe = -1;
+  int idxNum = 0;
+  int nArg = 0;
+
+  UNUSED_PARAM(pUnused);
+
+  for(i=0; i<pInfo->nConstraint; i++){
+    struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
+    if( p->usable==0 ) continue;
+    if( p->iColumn==0 ){          /* term column */
+      if( p->op==SQLITE_INDEX_CONSTRAINT_EQ ) iTermEq = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_LE ) iTermLe = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_LT ) iTermLe = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_GE ) iTermGe = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_GT ) iTermGe = i;
+    }
+  }
+
+  if( iTermEq>=0 ){
+    idxNum |= FTS5_VOCAB_TERM_EQ;
+    pInfo->aConstraintUsage[iTermEq].argvIndex = ++nArg;
+    pInfo->estimatedCost = 100;
+  }else{
+    pInfo->estimatedCost = 1000000;
+    if( iTermGe>=0 ){
+      idxNum |= FTS5_VOCAB_TERM_GE;
+      pInfo->aConstraintUsage[iTermGe].argvIndex = ++nArg;
+      pInfo->estimatedCost = pInfo->estimatedCost / 2;
+    }
+    if( iTermLe>=0 ){
+      idxNum |= FTS5_VOCAB_TERM_LE;
+      pInfo->aConstraintUsage[iTermLe].argvIndex = ++nArg;
+      pInfo->estimatedCost = pInfo->estimatedCost / 2;
+    }
+  }
+
+  /* This virtual table always delivers results in ascending order of
+  ** the "term" column (column 0). So if the user has requested this
+  ** specifically - "ORDER BY term" or "ORDER BY term ASC" - set the
+  ** sqlite3_index_info.orderByConsumed flag to tell the core the results
+  ** are already in sorted order.  */
+  if( pInfo->nOrderBy==1 
+   && pInfo->aOrderBy[0].iColumn==0 
+   && pInfo->aOrderBy[0].desc==0
+  ){
+    pInfo->orderByConsumed = 1;
+  }
+
+  pInfo->idxNum = idxNum;
+  return SQLITE_OK;
+}
+
+/*
+** Implementation of xOpen method.
+*/
+static int fts5VocabOpenMethod(
+  sqlite3_vtab *pVTab, 
+  sqlite3_vtab_cursor **ppCsr
+){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pVTab;
+  Fts5Table *pFts5 = 0;
+  Fts5VocabCursor *pCsr = 0;
+  int rc = SQLITE_OK;
+  sqlite3_stmt *pStmt = 0;
+  char *zSql = 0;
+
+  if( pTab->bBusy ){
+    pVTab->zErrMsg = sqlite3_mprintf(
+       "recursive definition for %s.%s", pTab->zFts5Db, pTab->zFts5Tbl
+    );
+    return SQLITE_ERROR;
+  }
+  zSql = sqlite3Fts5Mprintf(&rc,
+      "SELECT t.%Q FROM %Q.%Q AS t WHERE t.%Q MATCH '*id'",
+      pTab->zFts5Tbl, pTab->zFts5Db, pTab->zFts5Tbl, pTab->zFts5Tbl
+  );
+  if( zSql ){
+    rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pStmt, 0);
+  }
+  sqlite3_free(zSql);
+  assert( rc==SQLITE_OK || pStmt==0 );
+  if( rc==SQLITE_ERROR ) rc = SQLITE_OK;
+
+  pTab->bBusy = 1;
+  if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
+    i64 iId = sqlite3_column_int64(pStmt, 0);
+    pFts5 = sqlite3Fts5TableFromCsrid(pTab->pGlobal, iId);
+  }
+  pTab->bBusy = 0;
+
+  if( rc==SQLITE_OK ){
+    if( pFts5==0 ){
+      rc = sqlite3_finalize(pStmt);
+      pStmt = 0;
+      if( rc==SQLITE_OK ){
+        pVTab->zErrMsg = sqlite3_mprintf(
+            "no such fts5 table: %s.%s", pTab->zFts5Db, pTab->zFts5Tbl
+            );
+        rc = SQLITE_ERROR;
+      }
+    }else{
+      rc = sqlite3Fts5FlushToDisk(pFts5);
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    i64 nByte = pFts5->pConfig->nCol * sizeof(i64)*2 + sizeof(Fts5VocabCursor);
+    pCsr = (Fts5VocabCursor*)sqlite3Fts5MallocZero(&rc, nByte);
+  }
+
+  if( pCsr ){
+    pCsr->pFts5 = pFts5;
+    pCsr->pStmt = pStmt;
+    pCsr->aCnt = (i64*)&pCsr[1];
+    pCsr->aDoc = &pCsr->aCnt[pFts5->pConfig->nCol];
+  }else{
+    sqlite3_finalize(pStmt);
+  }
+
+  *ppCsr = (sqlite3_vtab_cursor*)pCsr;
+  return rc;
+}
+
+static void fts5VocabResetCursor(Fts5VocabCursor *pCsr){
+  pCsr->rowid = 0;
+  sqlite3Fts5IterClose(pCsr->pIter);
+  sqlite3Fts5StructureRelease(pCsr->pStruct);
+  pCsr->pStruct = 0;
+  pCsr->pIter = 0;
+  sqlite3_free(pCsr->zLeTerm);
+  pCsr->nLeTerm = -1;
+  pCsr->zLeTerm = 0;
+  pCsr->bEof = 0;
+}
+
+/*
+** Close the cursor.  For additional information see the documentation
+** on the xClose method of the virtual table interface.
+*/
+static int fts5VocabCloseMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  fts5VocabResetCursor(pCsr);
+  sqlite3Fts5BufferFree(&pCsr->term);
+  sqlite3_finalize(pCsr->pStmt);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+static int fts5VocabInstanceNewTerm(Fts5VocabCursor *pCsr){
+  int rc = SQLITE_OK;
+  
+  if( sqlite3Fts5IterEof(pCsr->pIter) ){
+    pCsr->bEof = 1;
+  }else{
+    const char *zTerm;
+    int nTerm;
+    zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm);
+    if( pCsr->nLeTerm>=0 ){
+      int nCmp = MIN(nTerm, pCsr->nLeTerm);
+      int bCmp = memcmp(pCsr->zLeTerm, zTerm, nCmp);
+      if( bCmp<0 || (bCmp==0 && pCsr->nLeTerm<nTerm) ){
+        pCsr->bEof = 1;
+      }
+    }
+
+    sqlite3Fts5BufferSet(&rc, &pCsr->term, nTerm, (const u8*)zTerm);
+  }
+  return rc;
+}
+
+static int fts5VocabInstanceNext(Fts5VocabCursor *pCsr){
+  int eDetail = pCsr->pFts5->pConfig->eDetail;
+  int rc = SQLITE_OK;
+  Fts5IndexIter *pIter = pCsr->pIter;
+  i64 *pp = &pCsr->iInstPos;
+  int *po = &pCsr->iInstOff;
+  
+  assert( sqlite3Fts5IterEof(pIter)==0 );
+  assert( pCsr->bEof==0 );
+  while( eDetail==FTS5_DETAIL_NONE
+      || sqlite3Fts5PoslistNext64(pIter->pData, pIter->nData, po, pp) 
+  ){
+    pCsr->iInstPos = 0;
+    pCsr->iInstOff = 0;
+
+    rc = sqlite3Fts5IterNextScan(pCsr->pIter);
+    if( rc==SQLITE_OK ){
+      rc = fts5VocabInstanceNewTerm(pCsr);
+      if( pCsr->bEof || eDetail==FTS5_DETAIL_NONE ) break;
+    }
+    if( rc ){
+      pCsr->bEof = 1;
+      break;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Advance the cursor to the next row in the table.
+*/
+static int fts5VocabNextMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pCursor->pVtab;
+  int nCol = pCsr->pFts5->pConfig->nCol;
+  int rc;
+
+  rc = sqlite3Fts5StructureTest(pCsr->pFts5->pIndex, pCsr->pStruct);
+  if( rc!=SQLITE_OK ) return rc;
+  pCsr->rowid++;
+
+  if( pTab->eType==FTS5_VOCAB_INSTANCE ){
+    return fts5VocabInstanceNext(pCsr);
+  }
+
+  if( pTab->eType==FTS5_VOCAB_COL ){
+    for(pCsr->iCol++; pCsr->iCol<nCol; pCsr->iCol++){
+      if( pCsr->aDoc[pCsr->iCol] ) break;
+    }
+  }
+
+  if( pTab->eType!=FTS5_VOCAB_COL || pCsr->iCol>=nCol ){
+    if( sqlite3Fts5IterEof(pCsr->pIter) ){
+      pCsr->bEof = 1;
+    }else{
+      const char *zTerm;
+      int nTerm;
+
+      zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm);
+      assert( nTerm>=0 );
+      if( pCsr->nLeTerm>=0 ){
+        int nCmp = MIN(nTerm, pCsr->nLeTerm);
+        int bCmp = memcmp(pCsr->zLeTerm, zTerm, nCmp);
+        if( bCmp<0 || (bCmp==0 && pCsr->nLeTerm<nTerm) ){
+          pCsr->bEof = 1;
+          return SQLITE_OK;
+        }
+      }
+
+      sqlite3Fts5BufferSet(&rc, &pCsr->term, nTerm, (const u8*)zTerm);
+      memset(pCsr->aCnt, 0, nCol * sizeof(i64));
+      memset(pCsr->aDoc, 0, nCol * sizeof(i64));
+      pCsr->iCol = 0;
+
+      assert( pTab->eType==FTS5_VOCAB_COL || pTab->eType==FTS5_VOCAB_ROW );
+      while( rc==SQLITE_OK ){
+        int eDetail = pCsr->pFts5->pConfig->eDetail;
+        const u8 *pPos; int nPos;   /* Position list */
+        i64 iPos = 0;               /* 64-bit position read from poslist */
+        int iOff = 0;               /* Current offset within position list */
+
+        pPos = pCsr->pIter->pData;
+        nPos = pCsr->pIter->nData;
+
+        switch( pTab->eType ){
+          case FTS5_VOCAB_ROW:
+            if( eDetail==FTS5_DETAIL_FULL ){
+              while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
+                pCsr->aCnt[0]++;
+              }
+            }
+            pCsr->aDoc[0]++;
+            break;
+
+          case FTS5_VOCAB_COL:
+            if( eDetail==FTS5_DETAIL_FULL ){
+              int iCol = -1;
+              while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
+                int ii = FTS5_POS2COLUMN(iPos);
+                if( iCol!=ii ){
+                  if( ii>=nCol ){
+                    rc = FTS5_CORRUPT;
+                    break;
+                  }
+                  pCsr->aDoc[ii]++;
+                  iCol = ii;
+                }
+                pCsr->aCnt[ii]++;
+              }
+            }else if( eDetail==FTS5_DETAIL_COLUMNS ){
+              while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff,&iPos) ){
+                assert_nc( iPos>=0 && iPos<nCol );
+                if( iPos>=nCol ){
+                  rc = FTS5_CORRUPT;
+                  break;
+                }
+                pCsr->aDoc[iPos]++;
+              }
+            }else{
+              assert( eDetail==FTS5_DETAIL_NONE );
+              pCsr->aDoc[0]++;
+            }
+            break;
+
+          default:
+            assert( pTab->eType==FTS5_VOCAB_INSTANCE );
+            break;
+        }
+
+        if( rc==SQLITE_OK ){
+          rc = sqlite3Fts5IterNextScan(pCsr->pIter);
+        }
+        if( pTab->eType==FTS5_VOCAB_INSTANCE ) break;
+
+        if( rc==SQLITE_OK ){
+          zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm);
+          if( nTerm!=pCsr->term.n 
+          || (nTerm>0 && memcmp(zTerm, pCsr->term.p, nTerm)) 
+          ){
+            break;
+          }
+          if( sqlite3Fts5IterEof(pCsr->pIter) ) break;
+        }
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK && pCsr->bEof==0 && pTab->eType==FTS5_VOCAB_COL ){
+    for(/* noop */; pCsr->iCol<nCol && pCsr->aDoc[pCsr->iCol]==0; pCsr->iCol++);
+    if( pCsr->iCol==nCol ){
+      rc = FTS5_CORRUPT;
+    }
+  }
+  return rc;
+}
+
+/*
+** This is the xFilter implementation for the virtual table.
+*/
+static int fts5VocabFilterMethod(
+  sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
+  int idxNum,                     /* Strategy index */
+  const char *zUnused,            /* Unused */
+  int nUnused,                    /* Number of elements in apVal */
+  sqlite3_value **apVal           /* Arguments for the indexing scheme */
+){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pCursor->pVtab;
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  int eType = pTab->eType;
+  int rc = SQLITE_OK;
+
+  int iVal = 0;
+  int f = FTS5INDEX_QUERY_SCAN;
+  const char *zTerm = 0;
+  int nTerm = 0;
+
+  sqlite3_value *pEq = 0;
+  sqlite3_value *pGe = 0;
+  sqlite3_value *pLe = 0;
+
+  UNUSED_PARAM2(zUnused, nUnused);
+
+  fts5VocabResetCursor(pCsr);
+  if( idxNum & FTS5_VOCAB_TERM_EQ ) pEq = apVal[iVal++];
+  if( idxNum & FTS5_VOCAB_TERM_GE ) pGe = apVal[iVal++];
+  if( idxNum & FTS5_VOCAB_TERM_LE ) pLe = apVal[iVal++];
+
+  if( pEq ){
+    zTerm = (const char *)sqlite3_value_text(pEq);
+    nTerm = sqlite3_value_bytes(pEq);
+    f = FTS5INDEX_QUERY_NOTOKENDATA;
+  }else{
+    if( pGe ){
+      zTerm = (const char *)sqlite3_value_text(pGe);
+      nTerm = sqlite3_value_bytes(pGe);
+    }
+    if( pLe ){
+      const char *zCopy = (const char *)sqlite3_value_text(pLe);
+      if( zCopy==0 ) zCopy = "";
+      pCsr->nLeTerm = sqlite3_value_bytes(pLe);
+      pCsr->zLeTerm = sqlite3_malloc(pCsr->nLeTerm+1);
+      if( pCsr->zLeTerm==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        memcpy(pCsr->zLeTerm, zCopy, pCsr->nLeTerm+1);
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    Fts5Index *pIndex = pCsr->pFts5->pIndex;
+    rc = sqlite3Fts5IndexQuery(pIndex, zTerm, nTerm, f, 0, &pCsr->pIter);
+    if( rc==SQLITE_OK ){
+      pCsr->pStruct = sqlite3Fts5StructureRef(pIndex);
+    }
+  }
+  if( rc==SQLITE_OK && eType==FTS5_VOCAB_INSTANCE ){
+    rc = fts5VocabInstanceNewTerm(pCsr);
+  }
+  if( rc==SQLITE_OK && !pCsr->bEof 
+   && (eType!=FTS5_VOCAB_INSTANCE 
+    || pCsr->pFts5->pConfig->eDetail!=FTS5_DETAIL_NONE)
+  ){
+    rc = fts5VocabNextMethod(pCursor);
+  }
+
+  return rc;
+}
+
+/* 
+** This is the xEof method of the virtual table. SQLite calls this 
+** routine to find out if it has reached the end of a result set.
+*/
+static int fts5VocabEofMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  return pCsr->bEof;
+}
+
+static int fts5VocabColumnMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
+  int iCol                        /* Index of column to read value from */
+){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  int eDetail = pCsr->pFts5->pConfig->eDetail;
+  int eType = ((Fts5VocabTable*)(pCursor->pVtab))->eType;
+  i64 iVal = 0;
+
+  if( iCol==0 ){
+    sqlite3_result_text(
+        pCtx, (const char*)pCsr->term.p, pCsr->term.n, SQLITE_TRANSIENT
+    );
+  }else if( eType==FTS5_VOCAB_COL ){
+    assert( iCol==1 || iCol==2 || iCol==3 );
+    if( iCol==1 ){
+      if( eDetail!=FTS5_DETAIL_NONE ){
+        const char *z = pCsr->pFts5->pConfig->azCol[pCsr->iCol];
+        sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC);
+      }
+    }else if( iCol==2 ){
+      iVal = pCsr->aDoc[pCsr->iCol];
+    }else{
+      iVal = pCsr->aCnt[pCsr->iCol];
+    }
+  }else if( eType==FTS5_VOCAB_ROW ){
+    assert( iCol==1 || iCol==2 );
+    if( iCol==1 ){
+      iVal = pCsr->aDoc[0];
+    }else{
+      iVal = pCsr->aCnt[0];
+    }
+  }else{
+    assert( eType==FTS5_VOCAB_INSTANCE );
+    switch( iCol ){
+      case 1:
+        sqlite3_result_int64(pCtx, pCsr->pIter->iRowid);
+        break;
+      case 2: {
+        int ii = -1;
+        if( eDetail==FTS5_DETAIL_FULL ){
+          ii = FTS5_POS2COLUMN(pCsr->iInstPos);
+        }else if( eDetail==FTS5_DETAIL_COLUMNS ){
+          ii = (int)pCsr->iInstPos;
+        }
+        if( ii>=0 && ii<pCsr->pFts5->pConfig->nCol ){
+          const char *z = pCsr->pFts5->pConfig->azCol[ii];
+          sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC);
+        }
+        break;
+      }
+      default: {
+        assert( iCol==3 );
+        if( eDetail==FTS5_DETAIL_FULL ){
+          int ii = FTS5_POS2OFFSET(pCsr->iInstPos);
+          sqlite3_result_int(pCtx, ii);
+        }
+        break;
+      }
+    }
+  }
+
+  if( iVal>0 ) sqlite3_result_int64(pCtx, iVal);
+  return SQLITE_OK;
+}
+
+/* 
+** This is the xRowid method. The SQLite core calls this routine to
+** retrieve the rowid for the current row of the result set. The
+** rowid should be written to *pRowid.
+*/
+static int fts5VocabRowidMethod(
+  sqlite3_vtab_cursor *pCursor, 
+  sqlite_int64 *pRowid
+){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  *pRowid = pCsr->rowid;
+  return SQLITE_OK;
+}
+
+static int sqlite3Fts5VocabInit(Fts5Global *pGlobal, sqlite3 *db){
+  static const sqlite3_module fts5Vocab = {
+    /* iVersion      */ 2,
+    /* xCreate       */ fts5VocabCreateMethod,
+    /* xConnect      */ fts5VocabConnectMethod,
+    /* xBestIndex    */ fts5VocabBestIndexMethod,
+    /* xDisconnect   */ fts5VocabDisconnectMethod,
+    /* xDestroy      */ fts5VocabDestroyMethod,
+    /* xOpen         */ fts5VocabOpenMethod,
+    /* xClose        */ fts5VocabCloseMethod,
+    /* xFilter       */ fts5VocabFilterMethod,
+    /* xNext         */ fts5VocabNextMethod,
+    /* xEof          */ fts5VocabEofMethod,
+    /* xColumn       */ fts5VocabColumnMethod,
+    /* xRowid        */ fts5VocabRowidMethod,
+    /* xUpdate       */ 0,
+    /* xBegin        */ 0,
+    /* xSync         */ 0,
+    /* xCommit       */ 0,
+    /* xRollback     */ 0,
+    /* xFindFunction */ 0,
+    /* xRename       */ 0,
+    /* xSavepoint    */ 0,
+    /* xRelease      */ 0,
+    /* xRollbackTo   */ 0,
+    /* xShadowName   */ 0,
+    /* xIntegrity    */ 0
+  };
+  void *p = (void*)pGlobal;
+
+  return sqlite3_create_module_v2(db, "fts5vocab", &fts5Vocab, p, 0);
+}
+
+
+    
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS5) */
diff --git a/third_party/sqlite3/ext/lib.symbols b/third_party/sqlite3/ext/lib.symbols
new file mode 100644
index 0000000000..14521ef400
--- /dev/null
+++ b/third_party/sqlite3/ext/lib.symbols
@@ -0,0 +1,5 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+sqlite3_fts5_init
diff --git a/third_party/sqlite3/ext/moz.build b/third_party/sqlite3/ext/moz.build
new file mode 100644
index 0000000000..ffd938b601
--- /dev/null
+++ b/third_party/sqlite3/ext/moz.build
@@ -0,0 +1,26 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+NoVisibilityFlags()
+
+# We allow warnings for third-party code that can be updated from upstream.
+AllowCompilerWarnings()
+
+if CONFIG["MOZ_FOLD_LIBS"]:
+    # When folding libraries, sqlite is actually in the nss library.
+    FINAL_LIBRARY = "nss"
+else:
+    # The final library is in config/external/sqlite
+    FINAL_LIBRARY = "sqlite"
+
+SOURCES += [
+    "fts5.c",
+]
+
+if CONFIG["OS_TARGET"] == "Linux" or CONFIG["OS_TARGET"] == "Android":
+    OS_LIBS += [
+        "m",
+    ]
diff --git a/third_party/sqlite3/ext/sqlite3ext.h b/third_party/sqlite3/ext/sqlite3ext.h
new file mode 100644
index 0000000000..ae0949baf7
--- /dev/null
+++ b/third_party/sqlite3/ext/sqlite3ext.h
@@ -0,0 +1,719 @@
+/*
+** 2006 June 7
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This header file defines the SQLite interface for use by
+** shared libraries that want to be imported as extensions into
+** an SQLite instance.  Shared libraries that intend to be loaded
+** as extensions by SQLite should #include this file instead of 
+** sqlite3.h.
+*/
+#ifndef SQLITE3EXT_H
+#define SQLITE3EXT_H
+#include "sqlite3.h"
+
+/*
+** The following structure holds pointers to all of the SQLite API
+** routines.
+**
+** WARNING:  In order to maintain backwards compatibility, add new
+** interfaces to the end of this structure only.  If you insert new
+** interfaces in the middle of this structure, then older different
+** versions of SQLite will not be able to load each other's shared
+** libraries!
+*/
+struct sqlite3_api_routines {
+  void * (*aggregate_context)(sqlite3_context*,int nBytes);
+  int  (*aggregate_count)(sqlite3_context*);
+  int  (*bind_blob)(sqlite3_stmt*,int,const void*,int n,void(*)(void*));
+  int  (*bind_double)(sqlite3_stmt*,int,double);
+  int  (*bind_int)(sqlite3_stmt*,int,int);
+  int  (*bind_int64)(sqlite3_stmt*,int,sqlite_int64);
+  int  (*bind_null)(sqlite3_stmt*,int);
+  int  (*bind_parameter_count)(sqlite3_stmt*);
+  int  (*bind_parameter_index)(sqlite3_stmt*,const char*zName);
+  const char * (*bind_parameter_name)(sqlite3_stmt*,int);
+  int  (*bind_text)(sqlite3_stmt*,int,const char*,int n,void(*)(void*));
+  int  (*bind_text16)(sqlite3_stmt*,int,const void*,int,void(*)(void*));
+  int  (*bind_value)(sqlite3_stmt*,int,const sqlite3_value*);
+  int  (*busy_handler)(sqlite3*,int(*)(void*,int),void*);
+  int  (*busy_timeout)(sqlite3*,int ms);
+  int  (*changes)(sqlite3*);
+  int  (*close)(sqlite3*);
+  int  (*collation_needed)(sqlite3*,void*,void(*)(void*,sqlite3*,
+                           int eTextRep,const char*));
+  int  (*collation_needed16)(sqlite3*,void*,void(*)(void*,sqlite3*,
+                             int eTextRep,const void*));
+  const void * (*column_blob)(sqlite3_stmt*,int iCol);
+  int  (*column_bytes)(sqlite3_stmt*,int iCol);
+  int  (*column_bytes16)(sqlite3_stmt*,int iCol);
+  int  (*column_count)(sqlite3_stmt*pStmt);
+  const char * (*column_database_name)(sqlite3_stmt*,int);
+  const void * (*column_database_name16)(sqlite3_stmt*,int);
+  const char * (*column_decltype)(sqlite3_stmt*,int i);
+  const void * (*column_decltype16)(sqlite3_stmt*,int);
+  double  (*column_double)(sqlite3_stmt*,int iCol);
+  int  (*column_int)(sqlite3_stmt*,int iCol);
+  sqlite_int64  (*column_int64)(sqlite3_stmt*,int iCol);
+  const char * (*column_name)(sqlite3_stmt*,int);
+  const void * (*column_name16)(sqlite3_stmt*,int);
+  const char * (*column_origin_name)(sqlite3_stmt*,int);
+  const void * (*column_origin_name16)(sqlite3_stmt*,int);
+  const char * (*column_table_name)(sqlite3_stmt*,int);
+  const void * (*column_table_name16)(sqlite3_stmt*,int);
+  const unsigned char * (*column_text)(sqlite3_stmt*,int iCol);
+  const void * (*column_text16)(sqlite3_stmt*,int iCol);
+  int  (*column_type)(sqlite3_stmt*,int iCol);
+  sqlite3_value* (*column_value)(sqlite3_stmt*,int iCol);
+  void * (*commit_hook)(sqlite3*,int(*)(void*),void*);
+  int  (*complete)(const char*sql);
+  int  (*complete16)(const void*sql);
+  int  (*create_collation)(sqlite3*,const char*,int,void*,
+                           int(*)(void*,int,const void*,int,const void*));
+  int  (*create_collation16)(sqlite3*,const void*,int,void*,
+                             int(*)(void*,int,const void*,int,const void*));
+  int  (*create_function)(sqlite3*,const char*,int,int,void*,
+                          void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+                          void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                          void (*xFinal)(sqlite3_context*));
+  int  (*create_function16)(sqlite3*,const void*,int,int,void*,
+                            void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xFinal)(sqlite3_context*));
+  int (*create_module)(sqlite3*,const char*,const sqlite3_module*,void*);
+  int  (*data_count)(sqlite3_stmt*pStmt);
+  sqlite3 * (*db_handle)(sqlite3_stmt*);
+  int (*declare_vtab)(sqlite3*,const char*);
+  int  (*enable_shared_cache)(int);
+  int  (*errcode)(sqlite3*db);
+  const char * (*errmsg)(sqlite3*);
+  const void * (*errmsg16)(sqlite3*);
+  int  (*exec)(sqlite3*,const char*,sqlite3_callback,void*,char**);
+  int  (*expired)(sqlite3_stmt*);
+  int  (*finalize)(sqlite3_stmt*pStmt);
+  void  (*free)(void*);
+  void  (*free_table)(char**result);
+  int  (*get_autocommit)(sqlite3*);
+  void * (*get_auxdata)(sqlite3_context*,int);
+  int  (*get_table)(sqlite3*,const char*,char***,int*,int*,char**);
+  int  (*global_recover)(void);
+  void  (*interruptx)(sqlite3*);
+  sqlite_int64  (*last_insert_rowid)(sqlite3*);
+  const char * (*libversion)(void);
+  int  (*libversion_number)(void);
+  void *(*malloc)(int);
+  char * (*mprintf)(const char*,...);
+  int  (*open)(const char*,sqlite3**);
+  int  (*open16)(const void*,sqlite3**);
+  int  (*prepare)(sqlite3*,const char*,int,sqlite3_stmt**,const char**);
+  int  (*prepare16)(sqlite3*,const void*,int,sqlite3_stmt**,const void**);
+  void * (*profile)(sqlite3*,void(*)(void*,const char*,sqlite_uint64),void*);
+  void  (*progress_handler)(sqlite3*,int,int(*)(void*),void*);
+  void *(*realloc)(void*,int);
+  int  (*reset)(sqlite3_stmt*pStmt);
+  void  (*result_blob)(sqlite3_context*,const void*,int,void(*)(void*));
+  void  (*result_double)(sqlite3_context*,double);
+  void  (*result_error)(sqlite3_context*,const char*,int);
+  void  (*result_error16)(sqlite3_context*,const void*,int);
+  void  (*result_int)(sqlite3_context*,int);
+  void  (*result_int64)(sqlite3_context*,sqlite_int64);
+  void  (*result_null)(sqlite3_context*);
+  void  (*result_text)(sqlite3_context*,const char*,int,void(*)(void*));
+  void  (*result_text16)(sqlite3_context*,const void*,int,void(*)(void*));
+  void  (*result_text16be)(sqlite3_context*,const void*,int,void(*)(void*));
+  void  (*result_text16le)(sqlite3_context*,const void*,int,void(*)(void*));
+  void  (*result_value)(sqlite3_context*,sqlite3_value*);
+  void * (*rollback_hook)(sqlite3*,void(*)(void*),void*);
+  int  (*set_authorizer)(sqlite3*,int(*)(void*,int,const char*,const char*,
+                         const char*,const char*),void*);
+  void  (*set_auxdata)(sqlite3_context*,int,void*,void (*)(void*));
+  char * (*xsnprintf)(int,char*,const char*,...);
+  int  (*step)(sqlite3_stmt*);
+  int  (*table_column_metadata)(sqlite3*,const char*,const char*,const char*,
+                                char const**,char const**,int*,int*,int*);
+  void  (*thread_cleanup)(void);
+  int  (*total_changes)(sqlite3*);
+  void * (*trace)(sqlite3*,void(*xTrace)(void*,const char*),void*);
+  int  (*transfer_bindings)(sqlite3_stmt*,sqlite3_stmt*);
+  void * (*update_hook)(sqlite3*,void(*)(void*,int ,char const*,char const*,
+                                         sqlite_int64),void*);
+  void * (*user_data)(sqlite3_context*);
+  const void * (*value_blob)(sqlite3_value*);
+  int  (*value_bytes)(sqlite3_value*);
+  int  (*value_bytes16)(sqlite3_value*);
+  double  (*value_double)(sqlite3_value*);
+  int  (*value_int)(sqlite3_value*);
+  sqlite_int64  (*value_int64)(sqlite3_value*);
+  int  (*value_numeric_type)(sqlite3_value*);
+  const unsigned char * (*value_text)(sqlite3_value*);
+  const void * (*value_text16)(sqlite3_value*);
+  const void * (*value_text16be)(sqlite3_value*);
+  const void * (*value_text16le)(sqlite3_value*);
+  int  (*value_type)(sqlite3_value*);
+  char *(*vmprintf)(const char*,va_list);
+  /* Added ??? */
+  int (*overload_function)(sqlite3*, const char *zFuncName, int nArg);
+  /* Added by 3.3.13 */
+  int (*prepare_v2)(sqlite3*,const char*,int,sqlite3_stmt**,const char**);
+  int (*prepare16_v2)(sqlite3*,const void*,int,sqlite3_stmt**,const void**);
+  int (*clear_bindings)(sqlite3_stmt*);
+  /* Added by 3.4.1 */
+  int (*create_module_v2)(sqlite3*,const char*,const sqlite3_module*,void*,
+                          void (*xDestroy)(void *));
+  /* Added by 3.5.0 */
+  int (*bind_zeroblob)(sqlite3_stmt*,int,int);
+  int (*blob_bytes)(sqlite3_blob*);
+  int (*blob_close)(sqlite3_blob*);
+  int (*blob_open)(sqlite3*,const char*,const char*,const char*,sqlite3_int64,
+                   int,sqlite3_blob**);
+  int (*blob_read)(sqlite3_blob*,void*,int,int);
+  int (*blob_write)(sqlite3_blob*,const void*,int,int);
+  int (*create_collation_v2)(sqlite3*,const char*,int,void*,
+                             int(*)(void*,int,const void*,int,const void*),
+                             void(*)(void*));
+  int (*file_control)(sqlite3*,const char*,int,void*);
+  sqlite3_int64 (*memory_highwater)(int);
+  sqlite3_int64 (*memory_used)(void);
+  sqlite3_mutex *(*mutex_alloc)(int);
+  void (*mutex_enter)(sqlite3_mutex*);
+  void (*mutex_free)(sqlite3_mutex*);
+  void (*mutex_leave)(sqlite3_mutex*);
+  int (*mutex_try)(sqlite3_mutex*);
+  int (*open_v2)(const char*,sqlite3**,int,const char*);
+  int (*release_memory)(int);
+  void (*result_error_nomem)(sqlite3_context*);
+  void (*result_error_toobig)(sqlite3_context*);
+  int (*sleep)(int);
+  void (*soft_heap_limit)(int);
+  sqlite3_vfs *(*vfs_find)(const char*);
+  int (*vfs_register)(sqlite3_vfs*,int);
+  int (*vfs_unregister)(sqlite3_vfs*);
+  int (*xthreadsafe)(void);
+  void (*result_zeroblob)(sqlite3_context*,int);
+  void (*result_error_code)(sqlite3_context*,int);
+  int (*test_control)(int, ...);
+  void (*randomness)(int,void*);
+  sqlite3 *(*context_db_handle)(sqlite3_context*);
+  int (*extended_result_codes)(sqlite3*,int);
+  int (*limit)(sqlite3*,int,int);
+  sqlite3_stmt *(*next_stmt)(sqlite3*,sqlite3_stmt*);
+  const char *(*sql)(sqlite3_stmt*);
+  int (*status)(int,int*,int*,int);
+  int (*backup_finish)(sqlite3_backup*);
+  sqlite3_backup *(*backup_init)(sqlite3*,const char*,sqlite3*,const char*);
+  int (*backup_pagecount)(sqlite3_backup*);
+  int (*backup_remaining)(sqlite3_backup*);
+  int (*backup_step)(sqlite3_backup*,int);
+  const char *(*compileoption_get)(int);
+  int (*compileoption_used)(const char*);
+  int (*create_function_v2)(sqlite3*,const char*,int,int,void*,
+                            void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xFinal)(sqlite3_context*),
+                            void(*xDestroy)(void*));
+  int (*db_config)(sqlite3*,int,...);
+  sqlite3_mutex *(*db_mutex)(sqlite3*);
+  int (*db_status)(sqlite3*,int,int*,int*,int);
+  int (*extended_errcode)(sqlite3*);
+  void (*log)(int,const char*,...);
+  sqlite3_int64 (*soft_heap_limit64)(sqlite3_int64);
+  const char *(*sourceid)(void);
+  int (*stmt_status)(sqlite3_stmt*,int,int);
+  int (*strnicmp)(const char*,const char*,int);
+  int (*unlock_notify)(sqlite3*,void(*)(void**,int),void*);
+  int (*wal_autocheckpoint)(sqlite3*,int);
+  int (*wal_checkpoint)(sqlite3*,const char*);
+  void *(*wal_hook)(sqlite3*,int(*)(void*,sqlite3*,const char*,int),void*);
+  int (*blob_reopen)(sqlite3_blob*,sqlite3_int64);
+  int (*vtab_config)(sqlite3*,int op,...);
+  int (*vtab_on_conflict)(sqlite3*);
+  /* Version 3.7.16 and later */
+  int (*close_v2)(sqlite3*);
+  const char *(*db_filename)(sqlite3*,const char*);
+  int (*db_readonly)(sqlite3*,const char*);
+  int (*db_release_memory)(sqlite3*);
+  const char *(*errstr)(int);
+  int (*stmt_busy)(sqlite3_stmt*);
+  int (*stmt_readonly)(sqlite3_stmt*);
+  int (*stricmp)(const char*,const char*);
+  int (*uri_boolean)(const char*,const char*,int);
+  sqlite3_int64 (*uri_int64)(const char*,const char*,sqlite3_int64);
+  const char *(*uri_parameter)(const char*,const char*);
+  char *(*xvsnprintf)(int,char*,const char*,va_list);
+  int (*wal_checkpoint_v2)(sqlite3*,const char*,int,int*,int*);
+  /* Version 3.8.7 and later */
+  int (*auto_extension)(void(*)(void));
+  int (*bind_blob64)(sqlite3_stmt*,int,const void*,sqlite3_uint64,
+                     void(*)(void*));
+  int (*bind_text64)(sqlite3_stmt*,int,const char*,sqlite3_uint64,
+                      void(*)(void*),unsigned char);
+  int (*cancel_auto_extension)(void(*)(void));
+  int (*load_extension)(sqlite3*,const char*,const char*,char**);
+  void *(*malloc64)(sqlite3_uint64);
+  sqlite3_uint64 (*msize)(void*);
+  void *(*realloc64)(void*,sqlite3_uint64);
+  void (*reset_auto_extension)(void);
+  void (*result_blob64)(sqlite3_context*,const void*,sqlite3_uint64,
+                        void(*)(void*));
+  void (*result_text64)(sqlite3_context*,const char*,sqlite3_uint64,
+                         void(*)(void*), unsigned char);
+  int (*strglob)(const char*,const char*);
+  /* Version 3.8.11 and later */
+  sqlite3_value *(*value_dup)(const sqlite3_value*);
+  void (*value_free)(sqlite3_value*);
+  int (*result_zeroblob64)(sqlite3_context*,sqlite3_uint64);
+  int (*bind_zeroblob64)(sqlite3_stmt*, int, sqlite3_uint64);
+  /* Version 3.9.0 and later */
+  unsigned int (*value_subtype)(sqlite3_value*);
+  void (*result_subtype)(sqlite3_context*,unsigned int);
+  /* Version 3.10.0 and later */
+  int (*status64)(int,sqlite3_int64*,sqlite3_int64*,int);
+  int (*strlike)(const char*,const char*,unsigned int);
+  int (*db_cacheflush)(sqlite3*);
+  /* Version 3.12.0 and later */
+  int (*system_errno)(sqlite3*);
+  /* Version 3.14.0 and later */
+  int (*trace_v2)(sqlite3*,unsigned,int(*)(unsigned,void*,void*,void*),void*);
+  char *(*expanded_sql)(sqlite3_stmt*);
+  /* Version 3.18.0 and later */
+  void (*set_last_insert_rowid)(sqlite3*,sqlite3_int64);
+  /* Version 3.20.0 and later */
+  int (*prepare_v3)(sqlite3*,const char*,int,unsigned int,
+                    sqlite3_stmt**,const char**);
+  int (*prepare16_v3)(sqlite3*,const void*,int,unsigned int,
+                      sqlite3_stmt**,const void**);
+  int (*bind_pointer)(sqlite3_stmt*,int,void*,const char*,void(*)(void*));
+  void (*result_pointer)(sqlite3_context*,void*,const char*,void(*)(void*));
+  void *(*value_pointer)(sqlite3_value*,const char*);
+  int (*vtab_nochange)(sqlite3_context*);
+  int (*value_nochange)(sqlite3_value*);
+  const char *(*vtab_collation)(sqlite3_index_info*,int);
+  /* Version 3.24.0 and later */
+  int (*keyword_count)(void);
+  int (*keyword_name)(int,const char**,int*);
+  int (*keyword_check)(const char*,int);
+  sqlite3_str *(*str_new)(sqlite3*);
+  char *(*str_finish)(sqlite3_str*);
+  void (*str_appendf)(sqlite3_str*, const char *zFormat, ...);
+  void (*str_vappendf)(sqlite3_str*, const char *zFormat, va_list);
+  void (*str_append)(sqlite3_str*, const char *zIn, int N);
+  void (*str_appendall)(sqlite3_str*, const char *zIn);
+  void (*str_appendchar)(sqlite3_str*, int N, char C);
+  void (*str_reset)(sqlite3_str*);
+  int (*str_errcode)(sqlite3_str*);
+  int (*str_length)(sqlite3_str*);
+  char *(*str_value)(sqlite3_str*);
+  /* Version 3.25.0 and later */
+  int (*create_window_function)(sqlite3*,const char*,int,int,void*,
+                            void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xFinal)(sqlite3_context*),
+                            void (*xValue)(sqlite3_context*),
+                            void (*xInv)(sqlite3_context*,int,sqlite3_value**),
+                            void(*xDestroy)(void*));
+  /* Version 3.26.0 and later */
+  const char *(*normalized_sql)(sqlite3_stmt*);
+  /* Version 3.28.0 and later */
+  int (*stmt_isexplain)(sqlite3_stmt*);
+  int (*value_frombind)(sqlite3_value*);
+  /* Version 3.30.0 and later */
+  int (*drop_modules)(sqlite3*,const char**);
+  /* Version 3.31.0 and later */
+  sqlite3_int64 (*hard_heap_limit64)(sqlite3_int64);
+  const char *(*uri_key)(const char*,int);
+  const char *(*filename_database)(const char*);
+  const char *(*filename_journal)(const char*);
+  const char *(*filename_wal)(const char*);
+  /* Version 3.32.0 and later */
+  const char *(*create_filename)(const char*,const char*,const char*,
+                           int,const char**);
+  void (*free_filename)(const char*);
+  sqlite3_file *(*database_file_object)(const char*);
+  /* Version 3.34.0 and later */
+  int (*txn_state)(sqlite3*,const char*);
+  /* Version 3.36.1 and later */
+  sqlite3_int64 (*changes64)(sqlite3*);
+  sqlite3_int64 (*total_changes64)(sqlite3*);
+  /* Version 3.37.0 and later */
+  int (*autovacuum_pages)(sqlite3*,
+     unsigned int(*)(void*,const char*,unsigned int,unsigned int,unsigned int),
+     void*, void(*)(void*));
+  /* Version 3.38.0 and later */
+  int (*error_offset)(sqlite3*);
+  int (*vtab_rhs_value)(sqlite3_index_info*,int,sqlite3_value**);
+  int (*vtab_distinct)(sqlite3_index_info*);
+  int (*vtab_in)(sqlite3_index_info*,int,int);
+  int (*vtab_in_first)(sqlite3_value*,sqlite3_value**);
+  int (*vtab_in_next)(sqlite3_value*,sqlite3_value**);
+  /* Version 3.39.0 and later */
+  int (*deserialize)(sqlite3*,const char*,unsigned char*,
+                     sqlite3_int64,sqlite3_int64,unsigned);
+  unsigned char *(*serialize)(sqlite3*,const char *,sqlite3_int64*,
+                              unsigned int);
+  const char *(*db_name)(sqlite3*,int);
+  /* Version 3.40.0 and later */
+  int (*value_encoding)(sqlite3_value*);
+  /* Version 3.41.0 and later */
+  int (*is_interrupted)(sqlite3*);
+  /* Version 3.43.0 and later */
+  int (*stmt_explain)(sqlite3_stmt*,int);
+  /* Version 3.44.0 and later */
+  void *(*get_clientdata)(sqlite3*,const char*);
+  int (*set_clientdata)(sqlite3*, const char*, void*, void(*)(void*));
+};
+
+/*
+** This is the function signature used for all extension entry points.  It
+** is also defined in the file "loadext.c".
+*/
+typedef int (*sqlite3_loadext_entry)(
+  sqlite3 *db,                       /* Handle to the database. */
+  char **pzErrMsg,                   /* Used to set error string on failure. */
+  const sqlite3_api_routines *pThunk /* Extension API function pointers. */
+);
+
+/*
+** The following macros redefine the API routines so that they are
+** redirected through the global sqlite3_api structure.
+**
+** This header file is also used by the loadext.c source file
+** (part of the main SQLite library - not an extension) so that
+** it can get access to the sqlite3_api_routines structure
+** definition.  But the main library does not want to redefine
+** the API.  So the redefinition macros are only valid if the
+** SQLITE_CORE macros is undefined.
+*/
+#if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)
+#define sqlite3_aggregate_context      sqlite3_api->aggregate_context
+#ifndef SQLITE_OMIT_DEPRECATED
+#define sqlite3_aggregate_count        sqlite3_api->aggregate_count
+#endif
+#define sqlite3_bind_blob              sqlite3_api->bind_blob
+#define sqlite3_bind_double            sqlite3_api->bind_double
+#define sqlite3_bind_int               sqlite3_api->bind_int
+#define sqlite3_bind_int64             sqlite3_api->bind_int64
+#define sqlite3_bind_null              sqlite3_api->bind_null
+#define sqlite3_bind_parameter_count   sqlite3_api->bind_parameter_count
+#define sqlite3_bind_parameter_index   sqlite3_api->bind_parameter_index
+#define sqlite3_bind_parameter_name    sqlite3_api->bind_parameter_name
+#define sqlite3_bind_text              sqlite3_api->bind_text
+#define sqlite3_bind_text16            sqlite3_api->bind_text16
+#define sqlite3_bind_value             sqlite3_api->bind_value
+#define sqlite3_busy_handler           sqlite3_api->busy_handler
+#define sqlite3_busy_timeout           sqlite3_api->busy_timeout
+#define sqlite3_changes                sqlite3_api->changes
+#define sqlite3_close                  sqlite3_api->close
+#define sqlite3_collation_needed       sqlite3_api->collation_needed
+#define sqlite3_collation_needed16     sqlite3_api->collation_needed16
+#define sqlite3_column_blob            sqlite3_api->column_blob
+#define sqlite3_column_bytes           sqlite3_api->column_bytes
+#define sqlite3_column_bytes16         sqlite3_api->column_bytes16
+#define sqlite3_column_count           sqlite3_api->column_count
+#define sqlite3_column_database_name   sqlite3_api->column_database_name
+#define sqlite3_column_database_name16 sqlite3_api->column_database_name16
+#define sqlite3_column_decltype        sqlite3_api->column_decltype
+#define sqlite3_column_decltype16      sqlite3_api->column_decltype16
+#define sqlite3_column_double          sqlite3_api->column_double
+#define sqlite3_column_int             sqlite3_api->column_int
+#define sqlite3_column_int64           sqlite3_api->column_int64
+#define sqlite3_column_name            sqlite3_api->column_name
+#define sqlite3_column_name16          sqlite3_api->column_name16
+#define sqlite3_column_origin_name     sqlite3_api->column_origin_name
+#define sqlite3_column_origin_name16   sqlite3_api->column_origin_name16
+#define sqlite3_column_table_name      sqlite3_api->column_table_name
+#define sqlite3_column_table_name16    sqlite3_api->column_table_name16
+#define sqlite3_column_text            sqlite3_api->column_text
+#define sqlite3_column_text16          sqlite3_api->column_text16
+#define sqlite3_column_type            sqlite3_api->column_type
+#define sqlite3_column_value           sqlite3_api->column_value
+#define sqlite3_commit_hook            sqlite3_api->commit_hook
+#define sqlite3_complete               sqlite3_api->complete
+#define sqlite3_complete16             sqlite3_api->complete16
+#define sqlite3_create_collation       sqlite3_api->create_collation
+#define sqlite3_create_collation16     sqlite3_api->create_collation16
+#define sqlite3_create_function        sqlite3_api->create_function
+#define sqlite3_create_function16      sqlite3_api->create_function16
+#define sqlite3_create_module          sqlite3_api->create_module
+#define sqlite3_create_module_v2       sqlite3_api->create_module_v2
+#define sqlite3_data_count             sqlite3_api->data_count
+#define sqlite3_db_handle              sqlite3_api->db_handle
+#define sqlite3_declare_vtab           sqlite3_api->declare_vtab
+#define sqlite3_enable_shared_cache    sqlite3_api->enable_shared_cache
+#define sqlite3_errcode                sqlite3_api->errcode
+#define sqlite3_errmsg                 sqlite3_api->errmsg
+#define sqlite3_errmsg16               sqlite3_api->errmsg16
+#define sqlite3_exec                   sqlite3_api->exec
+#ifndef SQLITE_OMIT_DEPRECATED
+#define sqlite3_expired                sqlite3_api->expired
+#endif
+#define sqlite3_finalize               sqlite3_api->finalize
+#define sqlite3_free                   sqlite3_api->free
+#define sqlite3_free_table             sqlite3_api->free_table
+#define sqlite3_get_autocommit         sqlite3_api->get_autocommit
+#define sqlite3_get_auxdata            sqlite3_api->get_auxdata
+#define sqlite3_get_table              sqlite3_api->get_table
+#ifndef SQLITE_OMIT_DEPRECATED
+#define sqlite3_global_recover         sqlite3_api->global_recover
+#endif
+#define sqlite3_interrupt              sqlite3_api->interruptx
+#define sqlite3_last_insert_rowid      sqlite3_api->last_insert_rowid
+#define sqlite3_libversion             sqlite3_api->libversion
+#define sqlite3_libversion_number      sqlite3_api->libversion_number
+#define sqlite3_malloc                 sqlite3_api->malloc
+#define sqlite3_mprintf                sqlite3_api->mprintf
+#define sqlite3_open                   sqlite3_api->open
+#define sqlite3_open16                 sqlite3_api->open16
+#define sqlite3_prepare                sqlite3_api->prepare
+#define sqlite3_prepare16              sqlite3_api->prepare16
+#define sqlite3_prepare_v2             sqlite3_api->prepare_v2
+#define sqlite3_prepare16_v2           sqlite3_api->prepare16_v2
+#define sqlite3_profile                sqlite3_api->profile
+#define sqlite3_progress_handler       sqlite3_api->progress_handler
+#define sqlite3_realloc                sqlite3_api->realloc
+#define sqlite3_reset                  sqlite3_api->reset
+#define sqlite3_result_blob            sqlite3_api->result_blob
+#define sqlite3_result_double          sqlite3_api->result_double
+#define sqlite3_result_error           sqlite3_api->result_error
+#define sqlite3_result_error16         sqlite3_api->result_error16
+#define sqlite3_result_int             sqlite3_api->result_int
+#define sqlite3_result_int64           sqlite3_api->result_int64
+#define sqlite3_result_null            sqlite3_api->result_null
+#define sqlite3_result_text            sqlite3_api->result_text
+#define sqlite3_result_text16          sqlite3_api->result_text16
+#define sqlite3_result_text16be        sqlite3_api->result_text16be
+#define sqlite3_result_text16le        sqlite3_api->result_text16le
+#define sqlite3_result_value           sqlite3_api->result_value
+#define sqlite3_rollback_hook          sqlite3_api->rollback_hook
+#define sqlite3_set_authorizer         sqlite3_api->set_authorizer
+#define sqlite3_set_auxdata            sqlite3_api->set_auxdata
+#define sqlite3_snprintf               sqlite3_api->xsnprintf
+#define sqlite3_step                   sqlite3_api->step
+#define sqlite3_table_column_metadata  sqlite3_api->table_column_metadata
+#define sqlite3_thread_cleanup         sqlite3_api->thread_cleanup
+#define sqlite3_total_changes          sqlite3_api->total_changes
+#define sqlite3_trace                  sqlite3_api->trace
+#ifndef SQLITE_OMIT_DEPRECATED
+#define sqlite3_transfer_bindings      sqlite3_api->transfer_bindings
+#endif
+#define sqlite3_update_hook            sqlite3_api->update_hook
+#define sqlite3_user_data              sqlite3_api->user_data
+#define sqlite3_value_blob             sqlite3_api->value_blob
+#define sqlite3_value_bytes            sqlite3_api->value_bytes
+#define sqlite3_value_bytes16          sqlite3_api->value_bytes16
+#define sqlite3_value_double           sqlite3_api->value_double
+#define sqlite3_value_int              sqlite3_api->value_int
+#define sqlite3_value_int64            sqlite3_api->value_int64
+#define sqlite3_value_numeric_type     sqlite3_api->value_numeric_type
+#define sqlite3_value_text             sqlite3_api->value_text
+#define sqlite3_value_text16           sqlite3_api->value_text16
+#define sqlite3_value_text16be         sqlite3_api->value_text16be
+#define sqlite3_value_text16le         sqlite3_api->value_text16le
+#define sqlite3_value_type             sqlite3_api->value_type
+#define sqlite3_vmprintf               sqlite3_api->vmprintf
+#define sqlite3_vsnprintf              sqlite3_api->xvsnprintf
+#define sqlite3_overload_function      sqlite3_api->overload_function
+#define sqlite3_prepare_v2             sqlite3_api->prepare_v2
+#define sqlite3_prepare16_v2           sqlite3_api->prepare16_v2
+#define sqlite3_clear_bindings         sqlite3_api->clear_bindings
+#define sqlite3_bind_zeroblob          sqlite3_api->bind_zeroblob
+#define sqlite3_blob_bytes             sqlite3_api->blob_bytes
+#define sqlite3_blob_close             sqlite3_api->blob_close
+#define sqlite3_blob_open              sqlite3_api->blob_open
+#define sqlite3_blob_read              sqlite3_api->blob_read
+#define sqlite3_blob_write             sqlite3_api->blob_write
+#define sqlite3_create_collation_v2    sqlite3_api->create_collation_v2
+#define sqlite3_file_control           sqlite3_api->file_control
+#define sqlite3_memory_highwater       sqlite3_api->memory_highwater
+#define sqlite3_memory_used            sqlite3_api->memory_used
+#define sqlite3_mutex_alloc            sqlite3_api->mutex_alloc
+#define sqlite3_mutex_enter            sqlite3_api->mutex_enter
+#define sqlite3_mutex_free             sqlite3_api->mutex_free
+#define sqlite3_mutex_leave            sqlite3_api->mutex_leave
+#define sqlite3_mutex_try              sqlite3_api->mutex_try
+#define sqlite3_open_v2                sqlite3_api->open_v2
+#define sqlite3_release_memory         sqlite3_api->release_memory
+#define sqlite3_result_error_nomem     sqlite3_api->result_error_nomem
+#define sqlite3_result_error_toobig    sqlite3_api->result_error_toobig
+#define sqlite3_sleep                  sqlite3_api->sleep
+#define sqlite3_soft_heap_limit        sqlite3_api->soft_heap_limit
+#define sqlite3_vfs_find               sqlite3_api->vfs_find
+#define sqlite3_vfs_register           sqlite3_api->vfs_register
+#define sqlite3_vfs_unregister         sqlite3_api->vfs_unregister
+#define sqlite3_threadsafe             sqlite3_api->xthreadsafe
+#define sqlite3_result_zeroblob        sqlite3_api->result_zeroblob
+#define sqlite3_result_error_code      sqlite3_api->result_error_code
+#define sqlite3_test_control           sqlite3_api->test_control
+#define sqlite3_randomness             sqlite3_api->randomness
+#define sqlite3_context_db_handle      sqlite3_api->context_db_handle
+#define sqlite3_extended_result_codes  sqlite3_api->extended_result_codes
+#define sqlite3_limit                  sqlite3_api->limit
+#define sqlite3_next_stmt              sqlite3_api->next_stmt
+#define sqlite3_sql                    sqlite3_api->sql
+#define sqlite3_status                 sqlite3_api->status
+#define sqlite3_backup_finish          sqlite3_api->backup_finish
+#define sqlite3_backup_init            sqlite3_api->backup_init
+#define sqlite3_backup_pagecount       sqlite3_api->backup_pagecount
+#define sqlite3_backup_remaining       sqlite3_api->backup_remaining
+#define sqlite3_backup_step            sqlite3_api->backup_step
+#define sqlite3_compileoption_get      sqlite3_api->compileoption_get
+#define sqlite3_compileoption_used     sqlite3_api->compileoption_used
+#define sqlite3_create_function_v2     sqlite3_api->create_function_v2
+#define sqlite3_db_config              sqlite3_api->db_config
+#define sqlite3_db_mutex               sqlite3_api->db_mutex
+#define sqlite3_db_status              sqlite3_api->db_status
+#define sqlite3_extended_errcode       sqlite3_api->extended_errcode
+#define sqlite3_log                    sqlite3_api->log
+#define sqlite3_soft_heap_limit64      sqlite3_api->soft_heap_limit64
+#define sqlite3_sourceid               sqlite3_api->sourceid
+#define sqlite3_stmt_status            sqlite3_api->stmt_status
+#define sqlite3_strnicmp               sqlite3_api->strnicmp
+#define sqlite3_unlock_notify          sqlite3_api->unlock_notify
+#define sqlite3_wal_autocheckpoint     sqlite3_api->wal_autocheckpoint
+#define sqlite3_wal_checkpoint         sqlite3_api->wal_checkpoint
+#define sqlite3_wal_hook               sqlite3_api->wal_hook
+#define sqlite3_blob_reopen            sqlite3_api->blob_reopen
+#define sqlite3_vtab_config            sqlite3_api->vtab_config
+#define sqlite3_vtab_on_conflict       sqlite3_api->vtab_on_conflict
+/* Version 3.7.16 and later */
+#define sqlite3_close_v2               sqlite3_api->close_v2
+#define sqlite3_db_filename            sqlite3_api->db_filename
+#define sqlite3_db_readonly            sqlite3_api->db_readonly
+#define sqlite3_db_release_memory      sqlite3_api->db_release_memory
+#define sqlite3_errstr                 sqlite3_api->errstr
+#define sqlite3_stmt_busy              sqlite3_api->stmt_busy
+#define sqlite3_stmt_readonly          sqlite3_api->stmt_readonly
+#define sqlite3_stricmp                sqlite3_api->stricmp
+#define sqlite3_uri_boolean            sqlite3_api->uri_boolean
+#define sqlite3_uri_int64              sqlite3_api->uri_int64
+#define sqlite3_uri_parameter          sqlite3_api->uri_parameter
+#define sqlite3_uri_vsnprintf          sqlite3_api->xvsnprintf
+#define sqlite3_wal_checkpoint_v2      sqlite3_api->wal_checkpoint_v2
+/* Version 3.8.7 and later */
+#define sqlite3_auto_extension         sqlite3_api->auto_extension
+#define sqlite3_bind_blob64            sqlite3_api->bind_blob64
+#define sqlite3_bind_text64            sqlite3_api->bind_text64
+#define sqlite3_cancel_auto_extension  sqlite3_api->cancel_auto_extension
+#define sqlite3_load_extension         sqlite3_api->load_extension
+#define sqlite3_malloc64               sqlite3_api->malloc64
+#define sqlite3_msize                  sqlite3_api->msize
+#define sqlite3_realloc64              sqlite3_api->realloc64
+#define sqlite3_reset_auto_extension   sqlite3_api->reset_auto_extension
+#define sqlite3_result_blob64          sqlite3_api->result_blob64
+#define sqlite3_result_text64          sqlite3_api->result_text64
+#define sqlite3_strglob                sqlite3_api->strglob
+/* Version 3.8.11 and later */
+#define sqlite3_value_dup              sqlite3_api->value_dup
+#define sqlite3_value_free             sqlite3_api->value_free
+#define sqlite3_result_zeroblob64      sqlite3_api->result_zeroblob64
+#define sqlite3_bind_zeroblob64        sqlite3_api->bind_zeroblob64
+/* Version 3.9.0 and later */
+#define sqlite3_value_subtype          sqlite3_api->value_subtype
+#define sqlite3_result_subtype         sqlite3_api->result_subtype
+/* Version 3.10.0 and later */
+#define sqlite3_status64               sqlite3_api->status64
+#define sqlite3_strlike                sqlite3_api->strlike
+#define sqlite3_db_cacheflush          sqlite3_api->db_cacheflush
+/* Version 3.12.0 and later */
+#define sqlite3_system_errno           sqlite3_api->system_errno
+/* Version 3.14.0 and later */
+#define sqlite3_trace_v2               sqlite3_api->trace_v2
+#define sqlite3_expanded_sql           sqlite3_api->expanded_sql
+/* Version 3.18.0 and later */
+#define sqlite3_set_last_insert_rowid  sqlite3_api->set_last_insert_rowid
+/* Version 3.20.0 and later */
+#define sqlite3_prepare_v3             sqlite3_api->prepare_v3
+#define sqlite3_prepare16_v3           sqlite3_api->prepare16_v3
+#define sqlite3_bind_pointer           sqlite3_api->bind_pointer
+#define sqlite3_result_pointer         sqlite3_api->result_pointer
+#define sqlite3_value_pointer          sqlite3_api->value_pointer
+/* Version 3.22.0 and later */
+#define sqlite3_vtab_nochange          sqlite3_api->vtab_nochange
+#define sqlite3_value_nochange         sqlite3_api->value_nochange
+#define sqlite3_vtab_collation         sqlite3_api->vtab_collation
+/* Version 3.24.0 and later */
+#define sqlite3_keyword_count          sqlite3_api->keyword_count
+#define sqlite3_keyword_name           sqlite3_api->keyword_name
+#define sqlite3_keyword_check          sqlite3_api->keyword_check
+#define sqlite3_str_new                sqlite3_api->str_new
+#define sqlite3_str_finish             sqlite3_api->str_finish
+#define sqlite3_str_appendf            sqlite3_api->str_appendf
+#define sqlite3_str_vappendf           sqlite3_api->str_vappendf
+#define sqlite3_str_append             sqlite3_api->str_append
+#define sqlite3_str_appendall          sqlite3_api->str_appendall
+#define sqlite3_str_appendchar         sqlite3_api->str_appendchar
+#define sqlite3_str_reset              sqlite3_api->str_reset
+#define sqlite3_str_errcode            sqlite3_api->str_errcode
+#define sqlite3_str_length             sqlite3_api->str_length
+#define sqlite3_str_value              sqlite3_api->str_value
+/* Version 3.25.0 and later */
+#define sqlite3_create_window_function sqlite3_api->create_window_function
+/* Version 3.26.0 and later */
+#define sqlite3_normalized_sql         sqlite3_api->normalized_sql
+/* Version 3.28.0 and later */
+#define sqlite3_stmt_isexplain         sqlite3_api->stmt_isexplain
+#define sqlite3_value_frombind         sqlite3_api->value_frombind
+/* Version 3.30.0 and later */
+#define sqlite3_drop_modules           sqlite3_api->drop_modules
+/* Version 3.31.0 and later */
+#define sqlite3_hard_heap_limit64      sqlite3_api->hard_heap_limit64
+#define sqlite3_uri_key                sqlite3_api->uri_key
+#define sqlite3_filename_database      sqlite3_api->filename_database
+#define sqlite3_filename_journal       sqlite3_api->filename_journal
+#define sqlite3_filename_wal           sqlite3_api->filename_wal
+/* Version 3.32.0 and later */
+#define sqlite3_create_filename        sqlite3_api->create_filename
+#define sqlite3_free_filename          sqlite3_api->free_filename
+#define sqlite3_database_file_object   sqlite3_api->database_file_object
+/* Version 3.34.0 and later */
+#define sqlite3_txn_state              sqlite3_api->txn_state
+/* Version 3.36.1 and later */
+#define sqlite3_changes64              sqlite3_api->changes64
+#define sqlite3_total_changes64        sqlite3_api->total_changes64
+/* Version 3.37.0 and later */
+#define sqlite3_autovacuum_pages       sqlite3_api->autovacuum_pages
+/* Version 3.38.0 and later */
+#define sqlite3_error_offset           sqlite3_api->error_offset
+#define sqlite3_vtab_rhs_value         sqlite3_api->vtab_rhs_value
+#define sqlite3_vtab_distinct          sqlite3_api->vtab_distinct
+#define sqlite3_vtab_in                sqlite3_api->vtab_in
+#define sqlite3_vtab_in_first          sqlite3_api->vtab_in_first
+#define sqlite3_vtab_in_next           sqlite3_api->vtab_in_next
+/* Version 3.39.0 and later */
+#ifndef SQLITE_OMIT_DESERIALIZE
+#define sqlite3_deserialize            sqlite3_api->deserialize
+#define sqlite3_serialize              sqlite3_api->serialize
+#endif
+#define sqlite3_db_name                sqlite3_api->db_name
+/* Version 3.40.0 and later */
+#define sqlite3_value_encoding         sqlite3_api->value_encoding
+/* Version 3.41.0 and later */
+#define sqlite3_is_interrupted         sqlite3_api->is_interrupted
+/* Version 3.43.0 and later */
+#define sqlite3_stmt_explain           sqlite3_api->stmt_explain
+/* Version 3.44.0 and later */
+#define sqlite3_get_clientdata         sqlite3_api->get_clientdata
+#define sqlite3_set_clientdata         sqlite3_api->set_clientdata
+#endif /* !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION) */
+
+#if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)
+  /* This case when the file really is being compiled as a loadable 
+  ** extension */
+# define SQLITE_EXTENSION_INIT1     const sqlite3_api_routines *sqlite3_api=0;
+# define SQLITE_EXTENSION_INIT2(v)  sqlite3_api=v;
+# define SQLITE_EXTENSION_INIT3     \
+    extern const sqlite3_api_routines *sqlite3_api;
+#else
+  /* This case when the file is being statically linked into the 
+  ** application */
+# define SQLITE_EXTENSION_INIT1     /*no-op*/
+# define SQLITE_EXTENSION_INIT2(v)  (void)v; /* unused parameter */
+# define SQLITE_EXTENSION_INIT3     /*no-op*/
+#endif
+
+#endif /* SQLITE3EXT_H */