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<h2>SQLite Release 3.39.4 On 2022-09-29</h2><p><b>Prior changes from version 3.39.0 (2022-06-25):</b></p>
<p><ol class='lessindent'>
<li value='1'> Add (long overdue) support for <a href="../lang_select.html#rjoin">RIGHT and FULL OUTER JOIN</a>.
<li> Add new binary comparison operators <a href="../lang_expr.html#isdf">IS NOT DISTINCT FROM</a> and <a href="../lang_expr.html#isdf">IS DISTINCT FROM</a>
that are equivalent to IS and IS NOT, respective, for compatibility with
PostgreSQL and SQL standards.
<li> Add a new return code (value "3") from the <a href="../c3ref/vtab_distinct.html">sqlite3_vtab_distinct()</a>
interface that indicates a query that has both DISTINCT and ORDER BY
clauses.
<li> Added the <a href="../c3ref/db_name.html">sqlite3_db_name()</a> interface.
<li> The unix os interface resolves all symbolic links in database
filenames to create a canonical name for the database before the
file is opened.
If the <a href="../c3ref/c_open_autoproxy.html">SQLITE_OPEN_NOFOLLOW</a> flag is used with <a href="../c3ref/open.html">sqlite3_open_v2()</a>
or similar, the open will fail if any element of the path is a
symbolic link.
<li> Defer materializing views until the materialization
is actually needed, thus avoiding unnecessary work if the materialization turns
out to never be used.
<li> The <a href="../lang_select.html#resultset">HAVING clause</a> of a <a href="../lang_select.html">SELECT statement</a> is now allowed on any aggregate query,
even queries that do not have a <a href="../lang_select.html#resultset">GROUP BY clause</a>.
<li> Many <a href="../cpu.html#microopt">microoptimizations</a> collectively reduce CPU cycles by about 2.3%.
</ol>
<p><b>Prior changes from version 3.39.1 (2022-07-13):</b></p>
<p><ol class='lessindent'>
<li value='9'> Fix an incorrect result from a query that uses a view that contains a compound
SELECT in which only one arm contains a RIGHT JOIN and where the view is not
the first FROM clause term of the query that contains the view.
<a href="https://sqlite.org/forum/forumpost/174afeae5734d42d">forum post 174afeae5734d42d</a>.
<li> Fix some harmless compiler warnings.
<li> Fix a long-standing problem with <a href="../lang_altertable.html#altertabrename">ALTER TABLE RENAME</a> that can only arise
if the <a href="../c3ref/limit.html">sqlite3_limit</a>(<a href="../c3ref/c_limit_attached.html#sqlitelimitsqllength">SQLITE_LIMIT_SQL_LENGTH</a>) is set to a very small value.
<li> Fix a long-standing problem in <a href="../fts3.html">FTS3</a> that can only arise when compiled with
the <a href="../compile.html#enable_fts3_parenthesis">SQLITE_ENABLE_FTS3_PARENTHESIS</a> compile-time option.
<li> Fix the build so that is works when the <a href="../compile.html#debug">SQLITE_DEBUG</a> and
<a href="../compile.html#omit_windowfunc">SQLITE_OMIT_WINDOWFUNC</a> compile-time options are both provided at the
same time.
<li> Fix the initial-prefix optimization for the <a href="../lang_expr.html#regexp">REGEXP</a> extension so that it works
correctly even if the prefix contains characters that require a 3-byte UTF8
encoding.
<li> Enhance the <a href="../stmt.html">sqlite_stmt</a> virtual table so that it buffers all of its output.
</ol>
<p><b>Prior changes from version 3.39.2 (2022-07-21):</b></p>
<p><ol class='lessindent'>
<li value='16'> Fix a performance regression in the query planner associated with rearranging
the order of FROM clause terms in the presences of a LEFT JOIN.
<li> Apply fixes for CVE-2022-35737, Chromium bugs 1343348 and 1345947,
<a href="https://sqlite.org/forum/forumpost/3607259d3c">forum post 3607259d3c</a>, and
other minor problems discovered by internal testing.
</ol>
<p><b>Prior changes from version 3.39.3 (2022-09-05):</b></p>
<p><ol class='lessindent'>
<li value='18'> Use a statement journal on DML statement affecting two or more database
rows if the statement makes use of a SQL functions that might abort. See
<a href="https://sqlite.org/forum/forumpost/9b9e4716c0d7bbd1">forum thread 9b9e4716c0d7bbd1</a>.
<li> Use a mutex to protect the <a href="../pragma.html#pragma_temp_store_directory">PRAGMA temp_store_directory</a> and
<a href="../pragma.html#pragma_data_store_directory">PRAGMA data_store_directory</a> statements, even though they are deprecated and
documented as not being threadsafe. See
<a href="https://sqlite.org/forum/forumpost/719a11e1314d1c70">forum post 719a11e1314d1c70</a>.
<li> Other bug and warning fixes. See the
<a href="https://sqlite.org/src/timeline?p=version-3.39.3&bt=version-3.39.2">timeline</a>
for details.
</ol>
<p><b>Changes in this specific patch release, version 3.39.4 (2022-09-29):</b></p>
<p><ol class='lessindent'>
<li value='21'> Fix the build on Windows so that it works with -DSQLITE_OMIT_AUTOINIT
<li> Fix a long-standing problem in the btree balancer that might, in rare cases,
cause database corruption if the application uses an
<a href="../c3ref/pcache_methods2.html">application-defined page cache</a>.
<li> Enhance <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigdefensive">SQLITE_DBCONFIG_DEFENSIVE</a> so that it disallows <a href="../lang_createtrigger.html">CREATE TRIGGER</a>
statements if one or more of the statements in the body of the trigger write
into <a href="../vtab.html#xshadowname">shadow tables</a>.
<li> Fix a possible integer overflow in the size computation for a memory allocation
in FTS3.
<li> Fix a misuse of the <a href="../c3ref/get_auxdata.html">sqlite3_set_auxdata()</a> interface in the
<a href="https://sqlite.org/src/dir/ext/icu">ICU Extension</a>.
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: 2022-09-29 15:55:41 a29f9949895322123f7c38fbe94c649a9d6e6c9cd0c3b41c96d694552f26b309
<li>SHA3-256 for sqlite3.c: f65082298127e2ddae6539beb94f5204b591df64ba2c7da83c7d0faffd6959d8
</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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