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doc PG 18 relnotes: adjust hash item

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Reported-by: David Rowley

Discussion: https://postgr.es/m/CAApHDvrNmGncNgZMh2oBG5K-+4d1LGJgzrz7180OcHRT1VFojw@mail.gmail.com
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Bruce Momjian 2025-05-05 12:30:35 -04:00
parent cf847d6340
commit 092e72a930
1 changed files with 17 additions and 1 deletions
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18
doc/src/sgml/release-18.sgml
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@ -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>