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<h2>SQLite Release 3.35.0 On 2021-03-12</h2><p><ol class='lessindent'>
<li> Added <a href="../lang_mathfunc.html">built-in SQL math functions()</a>. (Requires the
     <a href="../compile.html#enable_math_functions">-DSQLITE_ENABLE_MATH_FUNCTIONS</a> compile-time option.)
<li> Added support for <a href="../lang_altertable.html#altertabdropcol">ALTER TABLE DROP COLUMN</a>.
<li> Generalize <a href="../lang_upsert.html">UPSERT</a>:
     <ol type="a">
     <li> Allow multiple ON CONFLICT clauses that are evaluated in order,
     <li> The final ON CONFLICT clause may omit the conflict target and
          yet still use DO UPDATE.
     </ol>
<li> Add support for the <a href="../lang_returning.html">RETURNING</a> clause on <a href="../lang_delete.html">DELETE</a>, <a href="../lang_insert.html">INSERT</a>, and
     <a href="../lang_update.html">UPDATE</a> statements.
<li> Use less memory when running <a href="../lang_vacuum.html">VACUUM</a> on databases containing very large
     TEXT or BLOB values.  It is no longer necessary to hold the entire TEXT
     or BLOB in memory all at once.
<li> Add support for the <a href="../lang_with.html#mathint">MATERIALIZED</a> and <a href="../lang_with.html#mathint">NOT MATERIALIZED</a> hints when
     specifying <a href="../lang_with.html">common table expressions</a>.  The default behavior was
     formerly NOT MATERIALIZED, but is now changed to MATERIALIZED for
     CTEs that are used more than once.
<li> The <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigenabletrigger">SQLITE_DBCONFIG_ENABLE_TRIGGER</a> and <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigenableview">SQLITE_DBCONFIG_ENABLE_VIEW</a>
     settings are modified so that they only control triggers and views
     in the main database schema or in attached database schemas and not in
     the TEMP schema. TEMP triggers and views are always allowed.
<li> Query planner/optimizer improvements:
     <ol type="a">
     <li> Enhancements to the <a href="../optoverview.html#minmax">min/max optimization</a> so that it works better
          with the IN operator and the OP_SeekScan optimization of the
          previous release.
     <li> Attempt to process EXISTS operators in the WHERE clause as if
          they were IN operators, in cases where this is a valid transformation
          and seems likely to improve performance.
     <li> Allow UNION ALL sub-queries to be <a href="../optoverview.html#flattening">flattened</a> even if the parent query is a join.
     <li> Use an index, if appropriate, on IS NOT NULL expressions in the WHERE clause,
          even if STAT4 is disabled.
     <li> Expressions of the form "x IS NULL" or "x IS NOT NULL" might be converted to simply
          FALSE or TRUE, if "x" is a column that has a "NOT NULL" constraint and is not
          involved in an outer join.
     <li> Avoid checking foreign key constraints on an UPDATE statement if the UPDATE does
          not modify any columns associated with the foreign key.
     <li> Allow WHERE terms to be <a href="../optoverview.html#pushdown">pushed down</a> into sub-queries
          that contain window functions,
          as long as the WHERE term is made up of entirely of constants and copies of expressions
          found in the PARTITION BY clauses of all window functions in the sub-query.
     </ol>
<li> <a href="../cli.html">CLI</a> enhancements:
     <ol type="a">
     <li> Enhance the ".stats" command to accept new arguments "stmt" and
          "vmstep", causing prepare statement statistics and only the
          virtual-machine step count to be shown, respectively.
     <li> Add the ".filectrl data_version" command.
     <li> Enhance the ".once" and ".output" commands so that if the destination argument
          begins with "|" (indicating that output is redirected into a pipe) then the
          argument does not need to be quoted.
     </ol>
<li> Bug fixes:
     <ol type="a">
     <li> Fix a potential NULL pointer dereference when processing a
          syntactically incorrect SELECT statement with a correlated WHERE
          clause and a "HAVING 0" clause.  (Also fixed in the 3.34.1 patch release.)
     <li> Fix a <a href="https://www.sqlite.org/src/info/ee51301f316c09e9">bug in the IN-operator optimization</a>
          of version 3.33.0 that can cause an incorrect answer.
     <li> Fix incorrect answers from the <a href="../lang_expr.html#like">LIKE operator</a> if the pattern ends with "%" and there
          is an "ESCAPE '_'" clause.
     </ol>
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: 2021-03-12 15:10:09 acd63062eb06748bfe9e4886639e4f2b54ea6a496a83f10716abbaba4115500b
<li>SHA3-256 for sqlite3.c: 73a740d881735bef9de7f7bce8c9e6b9e57fe3e77fa7d76a6e8fc5c262fbaedf

</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>