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<h2>SQLite Release 3.26.0 On 2018-12-01</h2><p><ol class='lessindent'>
<li>Optimization: When doing an <a href="../lang_update.html">UPDATE</a> on a table with <a href="../expridx.html">indexes on expressions</a>,
do not update the expression indexes if they do not refer to any of the columns
of the table being updated.
<li>Allow the <a href="../vtab.html#xbestindex">xBestIndex()</a> method of <a href="../vtab.html">virtual table</a> implementations to return
<a href="../rescode.html#constraint">SQLITE_CONSTRAINT</a> to indicate that the proposed query plan is unusable and
should not be given further consideration.
<li>Added the <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigdefensive">SQLITE_DBCONFIG_DEFENSIVE</a> option which disables the ability to
create corrupt database files using ordinary SQL.
<li>Added support for read-only <a href="../vtab.html#xshadowname">shadow tables</a> when the <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigdefensive">SQLITE_DBCONFIG_DEFENSIVE</a>
option is enabled.
<li>Added the <a href="../pragma.html#pragma_legacy_alter_table">PRAGMA legacy_alter_table</a> command, which if enabled causes the
<a href="../lang_altertable.html">ALTER TABLE</a> command to behave like older version of SQLite (prior to
version 3.25.0) for compatibility.
<li>Added <a href="../pragma.html#pragma_table_xinfo">PRAGMA table_xinfo</a> that works just like <a href="../pragma.html#pragma_table_info">PRAGMA table_info</a>
except that it also shows <a href="../vtab.html#hiddencol">hidden columns</a> in virtual tables.
<li>Added the <a href="https://sqlite.org/src/file/ext/misc/explain.c">explain virtual table</a>
as a run-time loadable extension.
<li>Add a limit counter to the query planner to prevent excessive
<a href="../c3ref/prepare.html">sqlite3_prepare()</a> times for certain pathological SQL inputs.
<li>Added support for the <a href="../c3ref/expanded_sql.html">sqlite3_normalized_sql()</a> interface, when compiling
with SQLITE_ENABLE_NORMALIZE.
<li>Enhanced triggers so that they can use <a href="../vtab.html#tabfunc2">table-valued functions</a> that
exist in schemas other than the schema where the trigger is defined.
<li>Enhancements to the <a href="../cli.html">CLI</a>:
<ol type="a">
<li>Improvements to the ".help" command.
<li>The SQLITE_HISTORY environment variable, if it exists,
specifies the name of the command-line editing history file
<li>The --deserialize option associated with opening a new database cause the
database file to be read into memory and accessed using the
<a href="../c3ref/deserialize.html">sqlite3_deserialize()</a> API. This simplifies running tests on a database
without modifying the file on disk.
</ol>
<li>Enhancements to the <a href="../geopoly.html">geopoly</a> extension:
<ol type="a">
<li>Always stores polygons
using the binary format, which is faster and uses less space.
<li>Added the <a href="../geopoly.html#regpoly">geopoly_regular()</a> function.
<li>Added the <a href="../geopoly.html#ccw">geopoly_ccw()</a> function.
</ol>
<li>Enhancements to the <a href="../sessionintro.html">session</a> extension:
<ol type="a">
<li>Added the <a href="../session/c_changesetapply_fknoaction.html">SQLITE_CHANGESETAPPLY_INVERT</a> flag
<li>Added the <a href="../session/sqlite3changeset_start.html">sqlite3changeset_start_v2()</a> interface and the
<a href="../session/c_changesetstart_invert.html">SQLITE_CHANGESETSTART_INVERT</a> flag.
<li>Added the
<a href="https://sqlite.org/src/file/ext/session/changesetfuzz.c">changesetfuzz.c</a>
test-case generator utility.
</ol>
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: "2018-12-01 12:34:55 bf8c1b2b7a5960c282e543b9c293686dccff272512d08865f4600fb58238b4f9"
<li>SHA3-256 for sqlite3.c: 72c08830da9b5d1cb397c612c0e870d7f5eb41a323b41aa3d8aa5ae9ccedb2c4
</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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