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authorBruce Momjian <bruce@momjian.us>2003-10-29 20:38:19 +0000
committerBruce Momjian <bruce@momjian.us>2003-10-29 20:38:19 +0000
commit1a2be80ee7e361da6887b03359135fb03e520550 (patch)
tree8db44c05f54c3c674ff6369fc7de0d7c019e0404 /doc/src
parenta00d6b23ebc27d66a090554e2e8c95fb0c26b9e6 (diff)
downloadpostgresql-1a2be80ee7e361da6887b03359135fb03e520550.tar.gz
postgresql-1a2be80ee7e361da6887b03359135fb03e520550.zip
Add first release note detail item.
Diffstat (limited to 'doc/src')
-rw-r--r--doc/src/sgml/release.sgml11
1 files changed, 10 insertions, 1 deletions
diff --git a/doc/src/sgml/release.sgml b/doc/src/sgml/release.sgml
index 91439c17f1e..afd5f8ffb3f 100644
--- a/doc/src/sgml/release.sgml
+++ b/doc/src/sgml/release.sgml
@@ -1,5 +1,5 @@
<!--
-$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>