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<h2>SQLite Release 3.38.4 On 2022-05-04</h2><p><b>Prior changes from version 3.38.0 (2022-02-22):</b></p>
<p><ol class='lessindent'>
<li value='1'> Added <a href="../json1.html#jptr">the -> and ->> operators</a> for easier processing of JSON.
The new operators are compatible with MySQL and PostgreSQL.
<li> The JSON functions are now built-ins. It is no longer necessary
to use the <a href="../compile.html#enable_json1">-DSQLITE_ENABLE_JSON1</a> compile-time option to enable JSON
support. JSON is on by default. Disable the JSON interface using
the new <a href="../compile.html#omit_json">-DSQLITE_OMIT_JSON</a> compile-time option.
<li> Enhancements to <a href="../lang_datefunc.html">date and time functions</a>:
<ol type="a">
<li> Added the <a href="../lang_datefunc.html#uepch">unixepoch() function</a>.
<li> Added the <a href="../lang_datefunc.html#automod">auto modifier</a> and the <a href="../lang_datefunc.html#jdmod">julianday modifier</a>.
</ol>
<li> Rename the <a href="../lang_corefunc.html#printf">printf() SQL function</a> to <a href="../lang_corefunc.html#format">format()</a> for better
compatibility. The original printf() name is retained as an alias
for backwards compatibility.
<li> Added the <a href="../c3ref/errcode.html">sqlite3_error_offset()</a> interface, which can sometimes
help to localize an SQL error to a specific character in the input
SQL text, so that applications can provide better error messages.
<li> Enhanced the interface to <a href="../vtab.html">virtual tables</a> as follows:
<ol type="a">
<li> Added the <a href="../c3ref/vtab_distinct.html">sqlite3_vtab_distinct()</a> interface.
<li> Added the <a href="../c3ref/vtab_rhs_value.html">sqlite3_vtab_rhs_value()</a> interface.
<li> Added new operator types <a href="../c3ref/c_index_constraint_eq.html">SQLITE_INDEX_CONSTRAINT_LIMIT</a>
and <a href="../c3ref/c_index_constraint_eq.html">SQLITE_INDEX_CONSTRAINT_OFFSET</a>.
<li> Added the <a href="../c3ref/vtab_in.html">sqlite3_vtab_in()</a> interface (and related) to enable
a virtual table to process <a href="../lang_expr.html#in_op">IN operator</a> constraints all at once,
rather than processing each value of the right-hand side of the
IN operator separately.
</ol>
<li> <a href="../cli.html">CLI</a> enhancements:
<ol type="a">
<li> <a href="../cli.html#clmnr">Columnar output modes</a> are enhanced to correctly handle tabs
and newlines embedded in text.
<li> Added options like "--wrap N", "--wordwrap on", and "--quote"
to the <a href="../cli.html#clmnr">columnar output modes</a>.
<li> Added the <a href="../cli.html#qbox">.mode qbox</a> alias.
<li> The <a href="../cli.html#csv">.import command</a> automatically disambiguates column names.
<li> Use the new <a href="../c3ref/errcode.html">sqlite3_error_offset()</a> interface to provide better
error messages.
</ol>
<li> Query planner enhancements:
<ol type="a">
<li> Use a Bloom filter to speed up large analytic queries.
<li> Use a balanced merge tree to evaluate UNION or UNION ALL
compound SELECT statements that have an ORDER BY clause.
</ol>
<li> The <a href="../lang_altertable.html">ALTER TABLE</a> statement is changed to silently ignores entries in the
<a href="../schematab.html">sqlite_schema table</a> that do not parse when <a href="../pragma.html#pragma_writable_schema">PRAGMA writable_schema=ON</a>.
</ol>
<p><b>Prior changes from version 3.38.1 (2022-03-12):</b></p>
<p><ol class='lessindent'>
<li value='10'> Fix problems with the new Bloom filter optimization that might cause
some obscure queries to get an incorrect answer.
<li> Fix the <a href="../lang_datefunc.html#localtime">localtime modifier</a> of the <a href="../lang_datefunc.html">date and time functions</a> so that
it preserves fractional seconds.
<li> Fix the <a href="../lang_corefunc.html#sqlite_offset">sqlite_offset SQL function</a> so that it works correctly even
in corner cases such as when the argument is a virtual column or the
column of a view.
<li> Fix <a href="../rowvalue.html#rvinop">row value IN operator</a> constraints on <a href="../vtab.html">virtual tables</a> so that they
work correctly even if the virtual table implementation relies on bytecode
to filter rows that do not satisfy the constraint.
<li> Other minor fixes to assert() statements, test cases, and documentation.
See the <a href="https://sqlite.org/src/timeline?p=version-3.38.1&bt=version-3.38.0">source code timeline</a>
for details.
</ol>
<p><b>Prior changes from version 3.38.2 (2022-03-26):</b></p>
<p><ol class='lessindent'>
<li value='15'> Fix a user-discovered problem with the new Bloom filter optimization
that might cause an incorrect answer when doing a LEFT JOIN with a WHERE
clause constraint that says that one of the columns on the right table of
the LEFT JOIN is NULL. See
<a href='https://sqlite.org/forum/forumpost/031e262a89b6a9d2'>forum thread 031e262a89b6a9d2</a>.
<li> Other minor patches. See the
<a href='https://sqlite.org/src/timeline?p=version-3.38.2&bt=version-3.38.1'>timeline</a> for
details.
</ol>
<p><b>Prior changes from version 3.38.3 (2022-04-27):</b></p>
<p><ol class='lessindent'>
<li value='17'> Fix a case of the query planner be overly aggressive with optimizing automatic-index
and Bloom-filter construction, using inappropriate ON clause terms to restrict the
size of the automatic-index or Bloom filter, and resulting in missing rows in the
output.
<a href='https://sqlite.org/forum/forumpost/0d3200f4f3bcd3a3'>Forum thread 0d3200f4f3bcd3a3</a>.
<li> Other minor patches. See the
<a href='https://sqlite.org/src/timeline?p=version-3.38.3&bt=version-3.38.2'>timeline</a> for
details.
</ol>
<p><b>Changes in this specific patch release, version 3.38.4 (2022-05-04):</b></p>
<p><ol class='lessindent'>
<li value='19'> Fix a byte-code problem in the Bloom filter pull-down optimization added by release
3.38.0 in which an error in the byte code causes the byte code engine to enter an
infinite loop when the pull-down optimization encounters a NULL key.
<a href='https://sqlite.org/forum/forumpost/2482b32700384a0f'>Forum thread 2482b32700384a0f</a>.
<li> Other minor patches. See the
<a href='https://sqlite.org/src/timeline?p=branch-3.38&bt=version-3.38.3'>timeline</a> for
details.
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: 2022-05-04 15:45:55 d402f49871152670a62f4f28cacb15d814f2c1644e9347ad7d258e562978e45e
<li>SHA3-256 for sqlite3.c: e6a50effb021858c200e885664611ed3c5e949413ff2dca452ac7ee336b9de1d
</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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