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Add first release note detail item.

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Bruce Momjian 2003-10-29 20:38:19 +00:00
parent a00d6b23eb
commit 1a2be80ee7
1 changed files with 10 additions and 1 deletions
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doc/src/sgml/release.sgml
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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.218 2003/10/27 02:51:39 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.219 2003/10/29 20:38:19 momjian Exp $
-->
<appendix id="release">
@ -15,6 +15,15 @@ $Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.218 2003/10/27 02:51:39 mo
<glossentry><glossterm> Performance</glossterm>
<glossdef><para> IN/NOT IN subqueries are now much more efficient
<footnote>
<para>
In previous releases, IN/NOT IN subqueries were joined to the
upper query by sequentially scanning the subquery looking for
a join. The 7.4 code uses the same sophisticated techniques
used by ordinary joins and so is much faster, and is now faster
than EXISTS subqueries.
</para>
</footnote>
</para>
<para> Improved GROUP BY processing by using hash buckets</para>