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<h2>SQLite Release 3.23.1 On 2018-04-10</h2><p><b>Prior changes from version 3.23.0 (2018-04-02):</b></p>
<p><ol class='lessindent'>
<li value='1'> Add the <a href="../c3ref/serialize.html">sqlite3_serialize()</a> and <a href="../c3ref/deserialize.html">sqlite3_deserialize()</a> interfaces when
the <a href="../compile.html#enable_deserialize">SQLITE_ENABLE_DESERIALIZE</a> compile-time option is used.
<li> Recognize TRUE and FALSE as constants. (For compatibility, if there
exist columns named "true" or "false", then the identifiers refer to the
columns rather than Boolean constants.)
<li> Support operators IS TRUE, IS FALSE, IS NOT TRUE, and IS NOT FALSE.
<li> Added the <a href="../c3ref/c_dbstatus_options.html#sqlitedbstatuscachespill">SQLITE_DBSTATUS_CACHE_SPILL</a> option to <a href="../c3ref/db_status.html">sqlite3_db_status()</a> for
reporting the number of cache spills that have occurred.
<li> The "alternate-form-2" flag ("!") on the <a href="../printf.html">built-in printf</a> implementation
now causes string substitutions to measure the width and precision in
characters instead of bytes.
<li> If the <a href="../vtab.html#xcolumn">xColumn</a> method in a <a href="../vtab.html">virtual table</a> implementation returns
an error message using <a href="../c3ref/result_blob.html">sqlite3_result_error()</a> then give that error
message preference over internally-generated messages.
<li> Added the -A command-line option to the <a href="../cli.html">CLI</a> to make it easier to manage
<a href="../sqlar.html">SQLite Archive files</a>.
<li> Add support for INSERT OR REPLACE, INSERT OR IGNORE, and UPDATE OR REPLACE
in the <a href="../zipfile.html">Zipfile virtual table</a>.
<li> Enhance the <a href="../session/sqlite3changeset_apply.html">sqlite3changeset_apply()</a> interface so that it is hardened
against attacks from deliberately corrupted <a href="../sessionintro.html#changeset">changeset</a> objects.
<li> Added the <a href="https://sqlite.org/src/file/ext/misc/normalize.c">sqlite3_normalize()</a>
extension function.
<li> Query optimizer enhancements:
<ol type='a'>
<li> Improve the <a href="../optoverview.html#omitnoopjoin">omit-left-join optimization</a> so that it works in cases where
the right-hand table is UNIQUE but not necessarily NOT NULL.
<li> Improve the <a href="../optoverview.html#pushdown">push-down optimization</a> so that it works for many LEFT JOINs.
<li> Add the <a href="../optoverview.html#leftjoinreduction">LEFT JOIN strength reduction optimization</a> that converts a LEFT
JOIN into an ordinary JOIN if there exist terms in the WHERE clause
that would prevent the extra all-NULL row of the LEFT JOIN from
appearing in the output set.
<li> Avoid unnecessary writes to the sqlite_sequence table when an
<a href="../autoinc.html">AUTOINCREMENT</a> table is updated with an rowid that is less than the
maximum.
</ol>
<li> Bug fixes:
<ol type='a'>
<li> Fix the parser to accept valid <a href="../rowvalue.html">row value</a> syntax.
Ticket <a href="https://www.sqlite.org/src/info/7310e2fb3d046a5">7310e2fb3d046a5</a>
<li> Fix the query planner so that it takes into account dependencies in
the arguments to table-valued functions in subexpressions in
the WHERE clause.
Ticket <a href="https://www.sqlite.org/src/info/80177f0c226ff54">80177f0c226ff54</a>
<li> Fix incorrect result with complex OR-connected WHERE and STAT4.
Ticket <a href="https://www.sqlite.org/src/info/ec32177c99ccac2">ec32177c99ccac2</a>
<li> Fix potential corruption in <a href="../expridx.html">indexes on expressions</a> due to automatic
datatype conversions.
Ticket <a href="https://www.sqlite.org/src/info/343634942dd54ab">343634942dd54ab</a>
<li> Assertion fault in FTS4.
Ticket <a href="https://www.sqlite.org/src/info/d6ec09eccf68cfc">d6ec09eccf68cfc</a>
<li> Incorrect result on the less-than operator in <a href="../rowvalue.html">row values</a>.
Ticket <a href="https://www.sqlite.org/src/info/f484b65f3d62305">f484b65f3d62305</a>
<li> Always interpret non-zero floating-point values as TRUE, even if
the integer part is zero.
Ticket <a href="https://www.sqlite.org/src/info/36fae083b450e3a">36fae083b450e3a</a>
<li> Fix an issue in 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,
that caused a segfault if the fsdir() table was used as the inner table
of a join. Problem reported on the mailing list and fixed by check-in
<a href="https://www.sqlite.org/src/info/7ce4e71c1b7251be">7ce4e71c1b7251be</a>
<li> Issue an error rather instead of an assertion-fault or null-pointer
dereference when the sqlite_master table is corrupted so that the
sqlite_sequence table root page is really a btree-index page. Check-in
<a href="https://www.sqlite.org/src/info/525deb7a67fbd647">525deb7a67fbd647</a>
<li> Fix the <a href="../lang_analyze.html">ANALYZE</a> command so that it computes statistics on tables
whose names begin with "sqlite". Check-in
<a href="https://sqlite.org/src/info/0249d9aecf69948d">0249d9aecf69948d</a>
</ol>
<li> Additional fixes for issues detected by
<a href="https://github.com/google/oss-fuzz">OSSFuzz</a>:
<ol type='a'>
<li> Fix a possible infinite loop on VACUUM for corrupt database files.
Check-in <a href="https://www.sqlite.org/src/info/27754b74ddf64">27754b74ddf64</a>
<li> Disallow <a href="../lang_expr.html#varparam">parameters</a> in the <a href="../lang_with.html">WITH clause</a> of triggers and views.
Check-in <a href="https://www.sqlite.org/src/info/b918d4b4e546d">b918d4b4e546d</a>
<li> Fix a potential memory leak in <a href="../rowvalue.html">row value</a> processing.
Check-in <a href="https://www.sqlite.org/src/info/2df6bbf1b8ca8">2df6bbf1b8ca8</a>
<li> Improve the performance of the <a href="../lang_corefunc.html#replace">replace() SQL function</a> for cases where
there are many substitutions on megabyte-sized strings, in an attempt
to avoid OSSFuzz timeouts during testing.
Check-in <a href="https://www.sqlite.org/src/info/fab2c2b07b5d3">fab2c2b07b5d3</a>
<li> Provide an appropriate error message when the sqlite_master table
contains a CREATE TABLE AS statement. Formerly this caused either an
assertion fault or null pointer dereference. Problem found by OSSFuzz
on the GDAL project. Check-in
<a href="https://www.sqlite.org/src/info/d75e67654aa96">d75e67654aa96</a>
<li> Incorrect assert() statement removed. Check-in
<a href="https://www.sqlite.org/src/info/823779d31eb09cda">823779d31eb09cda</a>.
<li> Fix a problem with using the <a href="../optoverview.html#like_opt">LIKE optimization</a> on an
<a href="../lang_createtable.html#rowid">INTEGER PRIMARY KEY</a>. Check-in
<a href="https://www.sqlite.org/src/info/b850dd159918af56">b850dd159918af56</a>.
</ol>
</ol>
<p><b>Changes in this specific patch release, version 3.23.1 (2018-04-10):</b></p>
<p><ol class='lessindent'>
<li value='14'> Fix two problems in the new <a href="../optoverview.html#leftjoinreduction">LEFT JOIN strength reduction optimization</a>.
Tickets <a href="https://sqlite.org/src/info/1e39b966ae9ee739">1e39b966ae9ee739</a>
and <a href="https://sqlite.org/src/info/fac496b61722daf2">fac496b61722daf2</a>.
<li> Fix misbehavior of the FTS5 xBestIndex method. Ticket
<a href="https://sqlite.org/src/info/2b8aed9f7c9e61e8">2b8aed9f7c9e61e8</a>.
<li> Fix a harmless reference to an uninitialized virtual machine register.
Ticket <a href="https://sqlite.org/src/info/093420fc0eb7cba7">093420fc0eb7cba7</a>.
<li> Fix the <a href="../cli.html">CLI</a> so that it builds with -DSQLITE_UNTESTABLE
<li> Fix the <a href="https://sqlite.org/src/file/ext/misc/eval.c">eval.c</a> extension
so that it works with <a href="../pragma.html#pragma_empty_result_callbacks">PRAGMA empty_result_callbacks=ON</a>.
<li> Fix the <a href="../series.html">generate_series</a> virtual table so that it correctly returns
no rows if any of its constraints are NULL.
<li> Performance enhancements in the parser.
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: "2018-04-10 17:39:29 4bb2294022060e61de7da5c227a69ccd846ba330e31626ebcd59a94efd148b3b"
<li>SHA3-256 for sqlite3.c: 65750d1e506f416a0b0b9dd22d171379679c733e3460549754dc68c92705b5dc
</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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