Adding upstream version 14.5.upstream/14.5upstream

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

1 files changed, 571 insertions, 0 deletions

diff --git a/src/include/access/gist_private.h b/src/include/access/gist_private.h
new file mode 100644
index 0000000..553d364
--- /dev/null
+++ b/src/include/access/gist_private.h
@@ -0,0 +1,571 @@
+/*-------------------------------------------------------------------------
+ *
+ * gist_private.h
+ *	  private declarations for GiST -- declarations related to the
+ *	  internal implementation of GiST, not the public API
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/gist_private.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef GIST_PRIVATE_H
+#define GIST_PRIVATE_H
+
+#include "access/amapi.h"
+#include "access/gist.h"
+#include "access/itup.h"
+#include "lib/pairingheap.h"
+#include "storage/bufmgr.h"
+#include "storage/buffile.h"
+#include "utils/hsearch.h"
+#include "access/genam.h"
+
+/*
+ * Maximum number of "halves" a page can be split into in one operation.
+ * Typically a split produces 2 halves, but can be more if keys have very
+ * different lengths, or when inserting multiple keys in one operation (as
+ * when inserting downlinks to an internal node).  There is no theoretical
+ * limit on this, but in practice if you get more than a handful page halves
+ * in one split, there's something wrong with the opclass implementation.
+ * GIST_MAX_SPLIT_PAGES is an arbitrary limit on that, used to size some
+ * local arrays used during split.  Note that there is also a limit on the
+ * number of buffers that can be held locked at a time, MAX_SIMUL_LWLOCKS,
+ * so if you raise this higher than that limit, you'll just get a different
+ * error.
+ */
+#define GIST_MAX_SPLIT_PAGES		75
+
+/* Buffer lock modes */
+#define GIST_SHARE	BUFFER_LOCK_SHARE
+#define GIST_EXCLUSIVE	BUFFER_LOCK_EXCLUSIVE
+#define GIST_UNLOCK BUFFER_LOCK_UNLOCK
+
+typedef struct
+{
+	BlockNumber prev;
+	uint32		freespace;
+	char		tupledata[FLEXIBLE_ARRAY_MEMBER];
+} GISTNodeBufferPage;
+
+#define BUFFER_PAGE_DATA_OFFSET MAXALIGN(offsetof(GISTNodeBufferPage, tupledata))
+/* Returns free space in node buffer page */
+#define PAGE_FREE_SPACE(nbp) (nbp->freespace)
+/* Checks if node buffer page is empty */
+#define PAGE_IS_EMPTY(nbp) (nbp->freespace == BLCKSZ - BUFFER_PAGE_DATA_OFFSET)
+/* Checks if node buffers page don't contain sufficient space for index tuple */
+#define PAGE_NO_SPACE(nbp, itup) (PAGE_FREE_SPACE(nbp) < \
+										MAXALIGN(IndexTupleSize(itup)))
+
+/*
+ * GISTSTATE: information needed for any GiST index operation
+ *
+ * This struct retains call info for the index's opclass-specific support
+ * functions (per index column), plus the index's tuple descriptor.
+ *
+ * scanCxt holds the GISTSTATE itself as well as any data that lives for the
+ * lifetime of the index operation.  We pass this to the support functions
+ * via fn_mcxt, so that they can store scan-lifespan data in it.  The
+ * functions are invoked in tempCxt, which is typically short-lifespan
+ * (that is, it's reset after each tuple).  However, tempCxt can be the same
+ * as scanCxt if we're not bothering with per-tuple context resets.
+ */
+typedef struct GISTSTATE
+{
+	MemoryContext scanCxt;		/* context for scan-lifespan data */
+	MemoryContext tempCxt;		/* short-term context for calling functions */
+
+	TupleDesc	leafTupdesc;	/* index's tuple descriptor */
+	TupleDesc	nonLeafTupdesc; /* truncated tuple descriptor for non-leaf
+								 * pages */
+	TupleDesc	fetchTupdesc;	/* tuple descriptor for tuples returned in an
+								 * index-only scan */
+
+	FmgrInfo	consistentFn[INDEX_MAX_KEYS];
+	FmgrInfo	unionFn[INDEX_MAX_KEYS];
+	FmgrInfo	compressFn[INDEX_MAX_KEYS];
+	FmgrInfo	decompressFn[INDEX_MAX_KEYS];
+	FmgrInfo	penaltyFn[INDEX_MAX_KEYS];
+	FmgrInfo	picksplitFn[INDEX_MAX_KEYS];
+	FmgrInfo	equalFn[INDEX_MAX_KEYS];
+	FmgrInfo	distanceFn[INDEX_MAX_KEYS];
+	FmgrInfo	fetchFn[INDEX_MAX_KEYS];
+
+	/* Collations to pass to the support functions */
+	Oid			supportCollation[INDEX_MAX_KEYS];
+} GISTSTATE;
+
+
+/*
+ * During a GiST index search, we must maintain a queue of unvisited items,
+ * which can be either individual heap tuples or whole index pages.  If it
+ * is an ordered search, the unvisited items should be visited in distance
+ * order.  Unvisited items at the same distance should be visited in
+ * depth-first order, that is heap items first, then lower index pages, then
+ * upper index pages; this rule avoids doing extra work during a search that
+ * ends early due to LIMIT.
+ *
+ * To perform an ordered search, we use a pairing heap to manage the
+ * distance-order queue.  In a non-ordered search (no order-by operators),
+ * we use it to return heap tuples before unvisited index pages, to
+ * ensure depth-first order, but all entries are otherwise considered
+ * equal.
+ */
+
+/* Individual heap tuple to be visited */
+typedef struct GISTSearchHeapItem
+{
+	ItemPointerData heapPtr;
+	bool		recheck;		/* T if quals must be rechecked */
+	bool		recheckDistances;	/* T if distances must be rechecked */
+	HeapTuple	recontup;		/* data reconstructed from the index, used in
+								 * index-only scans */
+	OffsetNumber offnum;		/* track offset in page to mark tuple as
+								 * LP_DEAD */
+} GISTSearchHeapItem;
+
+/* Unvisited item, either index page or heap tuple */
+typedef struct GISTSearchItem
+{
+	pairingheap_node phNode;
+	BlockNumber blkno;			/* index page number, or InvalidBlockNumber */
+	union
+	{
+		GistNSN		parentlsn;	/* parent page's LSN, if index page */
+		/* we must store parentlsn to detect whether a split occurred */
+		GISTSearchHeapItem heap;	/* heap info, if heap tuple */
+	}			data;
+
+	/* numberOfOrderBys entries */
+	IndexOrderByDistance distances[FLEXIBLE_ARRAY_MEMBER];
+} GISTSearchItem;
+
+#define GISTSearchItemIsHeap(item)	((item).blkno == InvalidBlockNumber)
+
+#define SizeOfGISTSearchItem(n_distances) \
+	(offsetof(GISTSearchItem, distances) + \
+	 sizeof(IndexOrderByDistance) * (n_distances))
+
+/*
+ * GISTScanOpaqueData: private state for a scan of a GiST index
+ */
+typedef struct GISTScanOpaqueData
+{
+	GISTSTATE  *giststate;		/* index information, see above */
+	Oid		   *orderByTypes;	/* datatypes of ORDER BY expressions */
+
+	pairingheap *queue;			/* queue of unvisited items */
+	MemoryContext queueCxt;		/* context holding the queue */
+	bool		qual_ok;		/* false if qual can never be satisfied */
+	bool		firstCall;		/* true until first gistgettuple call */
+
+	/* pre-allocated workspace arrays */
+	IndexOrderByDistance *distances;	/* output area for gistindex_keytest */
+
+	/* info about killed items if any (killedItems is NULL if never used) */
+	OffsetNumber *killedItems;	/* offset numbers of killed items */
+	int			numKilled;		/* number of currently stored items */
+	BlockNumber curBlkno;		/* current number of block */
+	GistNSN		curPageLSN;		/* pos in the WAL stream when page was read */
+
+	/* In a non-ordered search, returnable heap items are stored here: */
+	GISTSearchHeapItem pageData[BLCKSZ / sizeof(IndexTupleData)];
+	OffsetNumber nPageData;		/* number of valid items in array */
+	OffsetNumber curPageData;	/* next item to return */
+	MemoryContext pageDataCxt;	/* context holding the fetched tuples, for
+								 * index-only scans */
+} GISTScanOpaqueData;
+
+typedef GISTScanOpaqueData *GISTScanOpaque;
+
+/* despite the name, gistxlogPage is not part of any xlog record */
+typedef struct gistxlogPage
+{
+	BlockNumber blkno;
+	int			num;			/* number of index tuples following */
+} gistxlogPage;
+
+/* SplitedPageLayout - gistSplit function result */
+typedef struct SplitedPageLayout
+{
+	gistxlogPage block;
+	IndexTupleData *list;
+	int			lenlist;
+	IndexTuple	itup;			/* union key for page */
+	Page		page;			/* to operate */
+	Buffer		buffer;			/* to write after all proceed */
+
+	struct SplitedPageLayout *next;
+} SplitedPageLayout;
+
+/*
+ * GISTInsertStack used for locking buffers and transfer arguments during
+ * insertion
+ */
+typedef struct GISTInsertStack
+{
+	/* current page */
+	BlockNumber blkno;
+	Buffer		buffer;
+	Page		page;
+
+	/*
+	 * log sequence number from page->lsn to recognize page update and compare
+	 * it with page's nsn to recognize page split
+	 */
+	GistNSN		lsn;
+
+	/*
+	 * If set, we split the page while descending the tree to find an
+	 * insertion target. It means that we need to retry from the parent,
+	 * because the downlink of this page might no longer cover the new key.
+	 */
+	bool		retry_from_parent;
+
+	/* offset of the downlink in the parent page, that points to this page */
+	OffsetNumber downlinkoffnum;
+
+	/* pointer to parent */
+	struct GISTInsertStack *parent;
+} GISTInsertStack;
+
+/* Working state and results for multi-column split logic in gistsplit.c */
+typedef struct GistSplitVector
+{
+	GIST_SPLITVEC splitVector;	/* passed to/from user PickSplit method */
+
+	Datum		spl_lattr[INDEX_MAX_KEYS];	/* Union of subkeys in
+											 * splitVector.spl_left */
+	bool		spl_lisnull[INDEX_MAX_KEYS];
+
+	Datum		spl_rattr[INDEX_MAX_KEYS];	/* Union of subkeys in
+											 * splitVector.spl_right */
+	bool		spl_risnull[INDEX_MAX_KEYS];
+
+	bool	   *spl_dontcare;	/* flags tuples which could go to either side
+								 * of the split for zero penalty */
+} GistSplitVector;
+
+typedef struct
+{
+	Relation	r;
+	Relation	heapRel;
+	Size		freespace;		/* free space to be left */
+	bool		is_build;
+
+	GISTInsertStack *stack;
+} GISTInsertState;
+
+/* root page of a gist index */
+#define GIST_ROOT_BLKNO				0
+
+/*
+ * Before PostgreSQL 9.1, we used to rely on so-called "invalid tuples" on
+ * inner pages to finish crash recovery of incomplete page splits. If a crash
+ * happened in the middle of a page split, so that the downlink pointers were
+ * not yet inserted, crash recovery inserted a special downlink pointer. The
+ * semantics of an invalid tuple was that it if you encounter one in a scan,
+ * it must always be followed, because we don't know if the tuples on the
+ * child page match or not.
+ *
+ * We no longer create such invalid tuples, we now mark the left-half of such
+ * an incomplete split with the F_FOLLOW_RIGHT flag instead, and finish the
+ * split properly the next time we need to insert on that page. To retain
+ * on-disk compatibility for the sake of pg_upgrade, we still store 0xffff as
+ * the offset number of all inner tuples. If we encounter any invalid tuples
+ * with 0xfffe during insertion, we throw an error, though scans still handle
+ * them. You should only encounter invalid tuples if you pg_upgrade a pre-9.1
+ * gist index which already has invalid tuples in it because of a crash. That
+ * should be rare, and you are recommended to REINDEX anyway if you have any
+ * invalid tuples in an index, so throwing an error is as far as we go with
+ * supporting that.
+ */
+#define TUPLE_IS_VALID		0xffff
+#define TUPLE_IS_INVALID	0xfffe
+
+#define  GistTupleIsInvalid(itup)	( ItemPointerGetOffsetNumber( &((itup)->t_tid) ) == TUPLE_IS_INVALID )
+#define  GistTupleSetValid(itup)	ItemPointerSetOffsetNumber( &((itup)->t_tid), TUPLE_IS_VALID )
+
+
+
+
+/*
+ * A buffer attached to an internal node, used when building an index in
+ * buffering mode.
+ */
+typedef struct
+{
+	BlockNumber nodeBlocknum;	/* index block # this buffer is for */
+	int32		blocksCount;	/* current # of blocks occupied by buffer */
+
+	BlockNumber pageBlocknum;	/* temporary file block # */
+	GISTNodeBufferPage *pageBuffer; /* in-memory buffer page */
+
+	/* is this buffer queued for emptying? */
+	bool		queuedForEmptying;
+
+	/* is this a temporary copy, not in the hash table? */
+	bool		isTemp;
+
+	int			level;			/* 0 == leaf */
+} GISTNodeBuffer;
+
+/*
+ * Does specified level have buffers? (Beware of multiple evaluation of
+ * arguments.)
+ */
+#define LEVEL_HAS_BUFFERS(nlevel, gfbb) \
+	((nlevel) != 0 && (nlevel) % (gfbb)->levelStep == 0 && \
+	 (nlevel) != (gfbb)->rootlevel)
+
+/* Is specified buffer at least half-filled (should be queued for emptying)? */
+#define BUFFER_HALF_FILLED(nodeBuffer, gfbb) \
+	((nodeBuffer)->blocksCount > (gfbb)->pagesPerBuffer / 2)
+
+/*
+ * Is specified buffer full? Our buffers can actually grow indefinitely,
+ * beyond the "maximum" size, so this just means whether the buffer has grown
+ * beyond the nominal maximum size.
+ */
+#define BUFFER_OVERFLOWED(nodeBuffer, gfbb) \
+	((nodeBuffer)->blocksCount > (gfbb)->pagesPerBuffer)
+
+/*
+ * Data structure with general information about build buffers.
+ */
+typedef struct GISTBuildBuffers
+{
+	/* Persistent memory context for the buffers and metadata. */
+	MemoryContext context;
+
+	BufFile    *pfile;			/* Temporary file to store buffers in */
+	long		nFileBlocks;	/* Current size of the temporary file */
+
+	/*
+	 * resizable array of free blocks.
+	 */
+	long	   *freeBlocks;
+	int			nFreeBlocks;	/* # of currently free blocks in the array */
+	int			freeBlocksLen;	/* current allocated length of the array */
+
+	/* Hash for buffers by block number */
+	HTAB	   *nodeBuffersTab;
+
+	/* List of buffers scheduled for emptying */
+	List	   *bufferEmptyingQueue;
+
+	/*
+	 * Parameters to the buffering build algorithm. levelStep determines which
+	 * levels in the tree have buffers, and pagesPerBuffer determines how
+	 * large each buffer is.
+	 */
+	int			levelStep;
+	int			pagesPerBuffer;
+
+	/* Array of lists of buffers on each level, for final emptying */
+	List	  **buffersOnLevels;
+	int			buffersOnLevelsLen;
+
+	/*
+	 * Dynamically-sized array of buffers that currently have their last page
+	 * loaded in main memory.
+	 */
+	GISTNodeBuffer **loadedBuffers;
+	int			loadedBuffersCount; /* # of entries in loadedBuffers */
+	int			loadedBuffersLen;	/* allocated size of loadedBuffers */
+
+	/* Level of the current root node (= height of the index tree - 1) */
+	int			rootlevel;
+} GISTBuildBuffers;
+
+/* GiSTOptions->buffering_mode values */
+typedef enum GistOptBufferingMode
+{
+	GIST_OPTION_BUFFERING_AUTO,
+	GIST_OPTION_BUFFERING_ON,
+	GIST_OPTION_BUFFERING_OFF
+} GistOptBufferingMode;
+
+/*
+ * Storage type for GiST's reloptions
+ */
+typedef struct GiSTOptions
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	int			fillfactor;		/* page fill factor in percent (0..100) */
+	GistOptBufferingMode buffering_mode;	/* buffering build mode */
+} GiSTOptions;
+
+/* gist.c */
+extern void gistbuildempty(Relation index);
+extern bool gistinsert(Relation r, Datum *values, bool *isnull,
+					   ItemPointer ht_ctid, Relation heapRel,
+					   IndexUniqueCheck checkUnique,
+					   bool indexUnchanged,
+					   struct IndexInfo *indexInfo);
+extern MemoryContext createTempGistContext(void);
+extern GISTSTATE *initGISTstate(Relation index);
+extern void freeGISTstate(GISTSTATE *giststate);
+extern void gistdoinsert(Relation r,
+						 IndexTuple itup,
+						 Size freespace,
+						 GISTSTATE *giststate,
+						 Relation heapRel,
+						 bool is_build);
+
+/* A List of these is returned from gistplacetopage() in *splitinfo */
+typedef struct
+{
+	Buffer		buf;			/* the split page "half" */
+	IndexTuple	downlink;		/* downlink for this half. */
+} GISTPageSplitInfo;
+
+extern bool gistplacetopage(Relation rel, Size freespace, GISTSTATE *giststate,
+							Buffer buffer,
+							IndexTuple *itup, int ntup,
+							OffsetNumber oldoffnum, BlockNumber *newblkno,
+							Buffer leftchildbuf,
+							List **splitinfo,
+							bool markfollowright,
+							Relation heapRel,
+							bool is_build);
+
+extern SplitedPageLayout *gistSplit(Relation r, Page page, IndexTuple *itup,
+									int len, GISTSTATE *giststate);
+
+/* gistxlog.c */
+extern XLogRecPtr gistXLogPageDelete(Buffer buffer,
+									 FullTransactionId xid, Buffer parentBuffer,
+									 OffsetNumber downlinkOffset);
+
+extern void gistXLogPageReuse(Relation rel, BlockNumber blkno,
+							  FullTransactionId latestRemovedXid);
+
+extern XLogRecPtr gistXLogUpdate(Buffer buffer,
+								 OffsetNumber *todelete, int ntodelete,
+								 IndexTuple *itup, int ntup,
+								 Buffer leftchild);
+
+extern XLogRecPtr gistXLogDelete(Buffer buffer, OffsetNumber *todelete,
+								 int ntodelete, TransactionId latestRemovedXid);
+
+extern XLogRecPtr gistXLogSplit(bool page_is_leaf,
+								SplitedPageLayout *dist,
+								BlockNumber origrlink, GistNSN oldnsn,
+								Buffer leftchild, bool markfollowright);
+
+extern XLogRecPtr gistXLogAssignLSN(void);
+
+/* gistget.c */
+extern bool gistgettuple(IndexScanDesc scan, ScanDirection dir);
+extern int64 gistgetbitmap(IndexScanDesc scan, TIDBitmap *tbm);
+extern bool gistcanreturn(Relation index, int attno);
+
+/* gistvalidate.c */
+extern bool gistvalidate(Oid opclassoid);
+extern void gistadjustmembers(Oid opfamilyoid,
+							  Oid opclassoid,
+							  List *operators,
+							  List *functions);
+
+/* gistutil.c */
+
+#define GiSTPageSize   \
+	( BLCKSZ - SizeOfPageHeaderData - MAXALIGN(sizeof(GISTPageOpaqueData)) )
+
+#define GIST_MIN_FILLFACTOR			10
+#define GIST_DEFAULT_FILLFACTOR		90
+
+extern bytea *gistoptions(Datum reloptions, bool validate);
+extern bool gistproperty(Oid index_oid, int attno,
+						 IndexAMProperty prop, const char *propname,
+						 bool *res, bool *isnull);
+extern bool gistfitpage(IndexTuple *itvec, int len);
+extern bool gistnospace(Page page, IndexTuple *itvec, int len, OffsetNumber todelete, Size freespace);
+extern void gistcheckpage(Relation rel, Buffer buf);
+extern Buffer gistNewBuffer(Relation r);
+extern bool gistPageRecyclable(Page page);
+extern void gistfillbuffer(Page page, IndexTuple *itup, int len,
+						   OffsetNumber off);
+extern IndexTuple *gistextractpage(Page page, int *len /* out */ );
+extern IndexTuple *gistjoinvector(IndexTuple *itvec, int *len,
+								  IndexTuple *additvec, int addlen);
+extern IndexTupleData *gistfillitupvec(IndexTuple *vec, int veclen, int *memlen);
+
+extern IndexTuple gistunion(Relation r, IndexTuple *itvec,
+							int len, GISTSTATE *giststate);
+extern IndexTuple gistgetadjusted(Relation r,
+								  IndexTuple oldtup,
+								  IndexTuple addtup,
+								  GISTSTATE *giststate);
+extern IndexTuple gistFormTuple(GISTSTATE *giststate,
+								Relation r, Datum *attdata, bool *isnull, bool isleaf);
+extern void gistCompressValues(GISTSTATE *giststate, Relation r,
+							   Datum *attdata, bool *isnull, bool isleaf, Datum *compatt);
+
+extern OffsetNumber gistchoose(Relation r, Page p,
+							   IndexTuple it,
+							   GISTSTATE *giststate);
+
+extern void GISTInitBuffer(Buffer b, uint32 f);
+extern void gistinitpage(Page page, uint32 f);
+extern void gistdentryinit(GISTSTATE *giststate, int nkey, GISTENTRY *e,
+						   Datum k, Relation r, Page pg, OffsetNumber o,
+						   bool l, bool isNull);
+
+extern float gistpenalty(GISTSTATE *giststate, int attno,
+						 GISTENTRY *key1, bool isNull1,
+						 GISTENTRY *key2, bool isNull2);
+extern void gistMakeUnionItVec(GISTSTATE *giststate, IndexTuple *itvec, int len,
+							   Datum *attr, bool *isnull);
+extern bool gistKeyIsEQ(GISTSTATE *giststate, int attno, Datum a, Datum b);
+extern void gistDeCompressAtt(GISTSTATE *giststate, Relation r, IndexTuple tuple, Page p,
+							  OffsetNumber o, GISTENTRY *attdata, bool *isnull);
+extern HeapTuple gistFetchTuple(GISTSTATE *giststate, Relation r,
+								IndexTuple tuple);
+extern void gistMakeUnionKey(GISTSTATE *giststate, int attno,
+							 GISTENTRY *entry1, bool isnull1,
+							 GISTENTRY *entry2, bool isnull2,
+							 Datum *dst, bool *dstisnull);
+
+extern XLogRecPtr gistGetFakeLSN(Relation rel);
+
+/* gistvacuum.c */
+extern IndexBulkDeleteResult *gistbulkdelete(IndexVacuumInfo *info,
+											 IndexBulkDeleteResult *stats,
+											 IndexBulkDeleteCallback callback,
+											 void *callback_state);
+extern IndexBulkDeleteResult *gistvacuumcleanup(IndexVacuumInfo *info,
+												IndexBulkDeleteResult *stats);
+
+/* gistsplit.c */
+extern void gistSplitByKey(Relation r, Page page, IndexTuple *itup,
+						   int len, GISTSTATE *giststate,
+						   GistSplitVector *v,
+						   int attno);
+
+/* gistbuild.c */
+extern IndexBuildResult *gistbuild(Relation heap, Relation index,
+								   struct IndexInfo *indexInfo);
+extern void gistValidateBufferingOption(const char *value);
+
+/* gistbuildbuffers.c */
+extern GISTBuildBuffers *gistInitBuildBuffers(int pagesPerBuffer, int levelStep,
+											  int maxLevel);
+extern GISTNodeBuffer *gistGetNodeBuffer(GISTBuildBuffers *gfbb,
+										 GISTSTATE *giststate,
+										 BlockNumber blkno, int level);
+extern void gistPushItupToNodeBuffer(GISTBuildBuffers *gfbb,
+									 GISTNodeBuffer *nodeBuffer, IndexTuple item);
+extern bool gistPopItupFromNodeBuffer(GISTBuildBuffers *gfbb,
+									  GISTNodeBuffer *nodeBuffer, IndexTuple *item);
+extern void gistFreeBuildBuffers(GISTBuildBuffers *gfbb);
+extern void gistRelocateBuildBuffersOnSplit(GISTBuildBuffers *gfbb,
+											GISTSTATE *giststate, Relation r,
+											int level, Buffer buffer,
+											List *splitinfo);
+extern void gistUnloadNodeBuffers(GISTBuildBuffers *gfbb);
+
+#endif							/* GIST_PRIVATE_H */