From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 5 May 2025 16:30:35 +0000 (-0400)
Subject: doc PG 18 relnotes:  adjust hash item
X-Git-Tag: REL_18_BETA1~3
X-Git-Url: http://git.postgresql.org/gitweb/?a=commitdiff_plain;h=092e72a93023fc9cea9cf673ab577ccd8537fb69;p=postgresql.git

doc PG 18 relnotes:  adjust hash item

Reported-by: David Rowley

Discussion: https://postgr.es/m/CAApHDvrNmGncNgZMh2oBG5K-+4d1LGJgzrz7180OcHRT1VFojw@mail.gmail.com
---

diff --git a/doc/src/sgml/release-18.sgml b/doc/src/sgml/release-18.sgml
index 86c4a231684..b281e210aae 100644
--- a/doc/src/sgml/release-18.sgml
+++ b/doc/src/sgml/release-18.sgml
@@ -363,12 +363,28 @@ Allow merge joins to use incremental sorts (Richard Guo)
 <!--
 Author: David Rowley <drowley@postgresql.org>
 2024-08-20 [adf97c156] Speed up Hash Join by making ExprStates support hashing
+Author: David Rowley <drowley@postgresql.org>
+2024-12-11 [0f5738202] Use ExprStates for hashing in GROUP BY and SubPlans
+Author: Jeff Davis <jdavis@postgresql.org>
+2025-03-24 [4d143509c] Create accessor functions for TupleHashEntry.
+Author: Jeff Davis <jdavis@postgresql.org>
+2025-03-24 [a0942f441] Add ExecCopySlotMinimalTupleExtra().
+Author: Jeff Davis <jdavis@postgresql.org>
+2025-03-24 [626df47ad] Remove 'additional' pointer from TupleHashEntryData.
 -->
 
 <listitem>
 <para>
-Improve the performance of hash joins (David Rowley)
+Improve the performance and reduce memory usage of hash joins and GROUP BY (David Rowley, Jeff Davis)
 <ulink url="&commit_baseurl;adf97c156">&sect;</ulink>
+<ulink url="&commit_baseurl;0f5738202">&sect;</ulink>
+<ulink url="&commit_baseurl;4d143509c">&sect;</ulink>
+<ulink url="&commit_baseurl;a0942f441">&sect;</ulink>
+<ulink url="&commit_baseurl;626df47ad">&sect;</ulink>
+</para>
+
+<para>
+This also improves hash set operations used by EXCEPT, and hash lookups of subplan values.
 </para>
 </listitem>