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<h2>SQLite Release 3.22.0 On 2018-01-22</h2><p><ol class='lessindent'>
<li> The output of <a href="../c3ref/trace_v2.html">sqlite3_trace_v2()</a> now shows each individual SQL statement
run within a trigger.
<li> Add the ability to read from <a href="../wal.html">WAL mode</a> databases even if the application
lacks write permission on the database and its containing directory, as long as
the -shm and -wal files exist in that directory.
<li> Added the <a href="../rtree.html#rtreecheck">rtreecheck()</a> scalar SQL function to the <a href="../rtree.html">R-Tree extension</a>.
<li> Added the <a href="../c3ref/vtab_nochange.html">sqlite3_vtab_nochange()</a> and <a href="../c3ref/value_blob.html">sqlite3_value_nochange()</a> interfaces
to help virtual table implementations optimize UPDATE operations.
<li> Added the <a href="../c3ref/vtab_collation.html">sqlite3_vtab_collation()</a> interface.
<li> Added support for the <a href="../fts5.html#carrotq">"^" initial token syntax</a> in FTS5.
<li> New extensions:
<ol type='a'>
<li> The <a href="../zipfile.html">Zipfile virtual table</a> can read and write a
<a href="https://en.wikipedia.org/wiki/Zip_(file_format)">ZIP Archive</a>.
<li> Added the fsdir(PATH) <a href="../vtab.html#tabfunc2">table-valued function</a> to the
<a href="https://sqlite.org/src/file/ext/misc/fileio.c">fileio.c</a> extension,
for listing the files in a directory.
<li> The <a href="https://sqlite.org/src/file/ext/misc/btreeinfo.c">sqlite_btreeinfo</a>
eponymous virtual table for introspecting and estimating the sizes of
the btrees in a database.
<li> The <a href="https://sqlite.org/src/file/ext/misc/appendvfs.c">Append VFS</a> is a
<a href="../vfs.html#shim">VFS shim</a> that allows an SQLite database to be appended to some other
file. This allows (for example) a database to be appended to an
executable that then opens and reads the database.
</ol>
<li> Query planner enhancements:
<ol type='a'>
<li> The optimization that uses an index to quickly compute an
aggregate min() or max() is extended to work with
<a href="../expridx.html">indexes on expressions</a>.
<li> The decision of whether to implement a FROM-clause subquery
as a co-routine or using <a href="../optoverview.html#flattening">query flattening</a>
now considers whether
the result set of the outer query is "complex" (if it
contains functions or expression subqueries). A complex result
set biases the decision toward the use of co-routines.
<li> The planner avoids query plans that use indexes with unknown
collating functions.
<li> The planner omits unused LEFT JOINs even if they are not the
right-most joins of a query.
</ol>
<li> Other performance optimizations:
<ol type='a'>
<li> A smaller and faster implementation of text to floating-point
conversion subroutine: sqlite3AtoF().
<li> The <a href="../lemon.html">Lemon parser generator</a> creates a faster parser.
<li> Use the strcspn() C-library routine to speed up the LIKE and
GLOB operators.
</ol>
<li> Improvements to the <a href="../cli.html">command-line shell</a>:
<ol type='a'>
<li> The ".schema" command shows the structure of virtual tables.
<li> Added support for reading and writing
<a href="../sqlar.html">SQLite Archive</a> files using
the <a href="../cli.html#sqlar">.archive command</a>.
<li> Added the experimental <a href="../cli.html#expert">.expert command</a>
<li> Added the ".eqp trigger" variant of the ".eqp" command
<li> Enhance the ".lint fkey-indexes" command so that it works with
<a href="../withoutrowid.html">WITHOUT ROWID</a> tables.
<li> If the filename argument to the shell is a ZIP archive rather than
an SQLite database, then the shell automatically opens that ZIP
archive using the <a href="../zipfile.html">Zipfile virtual table</a>.
<li> Added the <a href="../cli.html#editfunc">edit() SQL function</a>.
<li> Added the <a href="../cli.html#exexcel*">.excel command</a> to simplify exporting
database content to a spreadsheet.
<li> Databases are opened using
<a href="https://sqlite.org/src/file/ext/misc/appendvfs.c">Append VFS</a> when
the --append flag is used on the command line or with the
.open command.
</ol>
<li> Enhance the <a href="../compile.html#enable_update_delete_limit">SQLITE_ENABLE_UPDATE_DELETE_LIMIT</a> compile-time option so
that it works for <a href="../withoutrowid.html">WITHOUT ROWID</a> tables.
<li> Provide the <a href="../lang_corefunc.html#sqlite_offset">sqlite_offset(X)</a> SQL function that returns
the byte offset into the database file to the beginning of the record
holding value X, when compiling with <a href="../compile.html#enable_offset_sql_func">-DSQLITE_ENABLE_OFFSET_SQL_FUNC</a>.
<li> Bug fixes:
<ol type='a'>
<li> Infinite loop on an UPDATE that uses an OR operator in the WHERE clause.
Problem introduced with 3.17.0 and reported on the mailing list about
one year later. Ticket
<a href="https://www.sqlite.org/src/info/47b2581aa9bfecec">47b2581aa9bfecec</a>.
<li> Incorrect query results when the skip-ahead-distinct optimization is
used.
Ticket <a href="https://sqlite.org/src/info/ef9318757b152e3a">ef9318757b152e3a</a>.
<li> Incorrect query results on a join with a ORDER BY DESC. Ticket
<a href="https://sqlite.org/src/info/123c9ba32130a6c9">123c9ba32130a6c9</a>.
<li> Inconsistent result set column names between CREATE TABLE AS
and a simple SELECT. Ticket
<a href="https://sqlite.org/src/info/3b4450072511e621">3b4450072511e621</a>
<li> Assertion fault when doing REPLACE on an index on an expression.
Ticket <a href="https://sqlite.org/src/info/dc3f932f5a147771">dc3f932f5a147771</a>
<li> Assertion fault when doing an IN operator on a constant index.
Ticket <a href="https://sqlite.org/src/info/aa98619ad08ddcab">aa98619ad08ddcab</a>
</ol>
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: "2018-01-22 18:45:57 0c55d179733b46d8d0ba4d88e01a25e10677046ee3da1d5b1581e86726f2171d"
<li>SHA3-256 for sqlite3.c: 206df47ebc49cd1710ac0dd716ce5de5854826536993f4feab7a49d136b85069
</ol></p>
<p>A <a href="../changes.html">complete list of SQLite releases</a>
in a single page and a <a href="../chronology.html">chronology</a> are both also available.
A detailed history of every
check-in is available at
<a href="https://www.sqlite.org/src/timeline">
SQLite version control site</a>.</p>
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