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<h2>SQLite Release 3.25.1 On 2018-09-18</h2><p><b>Prior changes from version 3.25.0 (2018-09-15):</b></p>
<p><ol class='lessindent'>
<li value='1'> Add support for <a href="../windowfunctions.html">window functions</a>
<li> Enhancements the <a href="../lang_altertable.html">ALTER TABLE</a> command:
<ol type="a">
  <li> Add support for renaming columns within a table using
       ALTER TABLE <i>table</i> RENAME COLUMN <i>oldname</i> TO <i>newname</i>.
  <li> Fix table rename feature so that it also updates references
       to the renamed table in <a href="../lang_createtrigger.html">triggers</a> and <a href="../lang_createview.html">views</a>.
</ol>
<li> Query optimizer improvements:
<ol type="a">
  <li> Avoid unnecessary loads of columns in an aggregate query that
       are not within an aggregate function and that are not part
       of the GROUP BY clause.
  <li> The IN-early-out optimization: When doing a look-up on a
       multi-column index and an IN operator is used on a column
       other than the left-most column, then if no rows match against
       the first IN value, check to make sure there exist rows that
       match the columns to the right before continuing with the
       next IN value.
  <li> Use the transitive property to try to propagate constant
       values within the WHERE clause.  For example, convert
       "a=99 AND b=a" into "a=99 AND b=99".
</ol>
<li> Use a separate mutex on every inode in the unix <a href="../vfs.html">VFS</a>, rather than
     a single mutex shared among them all, for slightly better concurrency
     in multi-threaded environments.
<li> Enhance the <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> command for improved detection
     of problems on the page freelist.
<li> Output infinity as 1e999 in the ".dump" command of the
     <a href="../cli.html">command-line shell</a>.
<li> Added the <a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntldataversion">SQLITE_FCNTL_DATA_VERSION</a> file-control.
<li> Added the <a href="../geopoly.html">Geopoly module</a>
<p><b>Bug fixes:</b>
<li> The ORDER BY LIMIT optimization might have caused an infinite loop
     in the byte code of the prepared statement under very obscure
     circumstances,
     due to a confluence of minor defects in the query optimizer.
     Fix for ticket
     <a href="https://www.sqlite.org/src/info/9936b2fa443fec03ff25">9936b2fa443fec03ff25</a>
<li> On an UPSERT when the order of constraint checks is rearranged,
     ensure that the affinity transformations on the inserted content
     occur before any of the constraint checks. Fix for ticket
     <a href="https://www.sqlite.org/src/info/79cad5e4b2e219dd197242e9e">79cad5e4b2e219dd197242e9e</a>.
<li> Avoid using a prepared statement for ".stats on" command of the
     <a href="../cli.html">CLI</a> after it has been closed by the ".eqp full" logicc. Fix for ticket
     <a href="https://www.sqlite.org/src/info/7be932dfa60a8a6b3b26bcf76">7be932dfa60a8a6b3b26bcf76</a>.
<li> The LIKE optimization was generating incorrect byte-code and hence
     getting the wrong answer
     if the left-hand operand has numeric affinity and the right-hand-side
     pattern is '/%' or if the pattern begins with the ESCAPE character.
     Fix for ticket
     <a href="https://www.sqlite.org/src/info/c94369cae9b561b1f996d0054b">c94369cae9b561b1f996d0054b</a>
</ol>
<p><b>Changes in this specific patch release, version 3.25.1 (2018-09-18):</b></p>
<p><ol class='lessindent'>
<li value='13'> Extra sanity checking added to ALTER TABLE in the 3.25.0 release
     sometimes raises a false-positive
     when the table being modified has a trigger that
     updates a virtual table.  The false-positive caused the ALTER
     TABLE to rollback, thus leaving the schema unchanged.
     Ticket <a href="https://sqlite.org/src/info/b41031ea2b537237">b41031ea2b537237</a>.
<li> The fix in the 3.25.0 release for the endless-loop in the byte-code
     associated with the ORDER BY LIMIT optimization did not work for
     some queries involving window functions.  An additional correction
     is required.  Ticket
     <a href="https://sqlite.org/src/info/510cde277783b5fb">510cde277783b5fb</a>
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: "2018-09-18 20:20:44 2ac9003de44da7dafa3fbb1915ac5725a9275c86bf2f3b7aa19321bf1460b386"
<li>SHA3-256 for sqlite3.c: 1b2302e7a54cc99c84ff699a299f61f069a28e1ed090b89e4430ca80ae2aab06

</ol></p>

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