8000 doc PG 18 relnotes: mv. hash joins and GROUP BY item to General · postgres/postgres@99ddf86 · GitHub
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doc PG 18 relnotes: mv. hash joins and GROUP BY item to General
Reported-by: David Rowley Discussion: https://postgr.es/m/CAApHDvqJz+Zf7a6abisqoTGottDSRD+YPx=aQSgCsCKD476vGA@mail.gmail.com
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‎doc/src/sgml/release-18.sgml‎

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@@ -376,34 +376,6 @@ Allow merge joins to use incremental sorts (Richard Guo)
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</para>
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<!--
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Author: David Rowley <drowley@postgresql.org>
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2024-08-20 [adf97c156] Speed up Hash Join by making ExprStates support hashing
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Author: David Rowley <drowley@postgresql.org>
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2024-12-11 [0f5738202] Use ExprStates for hashing in GROUP BY and SubPlans
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Author: Jeff Davis <jdavis@postgresql.org>
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2025-03-24 [4d143509c] Create accessor functions for TupleHashEntry.
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Author: Jeff Davis <jdavis@postgresql.org>
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2025-03-24 [a0942f441] Add ExecCopySlotMinimalTupleExtra().
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Author: Jeff Davis <jdavis@postgresql.org>
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2025-03-24 [626df47ad] Remove 'additional' pointer from TupleHashEntryData.
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-->
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<listitem>
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<para>
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Improve the performance and reduce memory usage of hash joins and GROUP BY (David Rowley, Jeff Davis)
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<ulink url="&commit_baseurl;adf97c156">&sect;</ulink>
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<ulink url="&commit_baseurl;0f5738202">&sect;</ulink>
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<ulink url="&commit_baseurl;4d143509c">&sect;</ulink>
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<ulink url="&commit_baseurl;a0942f441">&sect;</ulink>
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<ulink url="&commit_baseurl;626df47ad">&sect;</ulink>
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</para>
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This also improves hash set operations used by EXCEPT, and hash lookups of subplan values.
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<!--
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Author: Amit Langote <amitlan@postgresql.org>
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2025-04-04 [88f55bc97] Make derived clause lookup in EquivalenceClass more effi
@@ -637,6 +609,34 @@ Avoid the locking of pruned partitions during execution (Amit Langote)
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</para>
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</listitem>
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<!--
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Author: David Rowley <drowley@postgresql.org>
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2024-08-20 [adf97c156] Speed up Hash Join by making ExprStates support hashing
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Author: David Rowley <drowley@postgresql.org>
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2024-12-11 [0f5738202] Use ExprStates for hashing in GROUP BY and SubPlans
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Author: Jeff Davis <jdavis@postgresql.org>
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2025-03-24 [4d143509c] Create accessor functions for TupleHashEntry.
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Author: Jeff Davis <jdavis@postgresql.org>
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2025-03-24 [a0942f441] Add ExecCopySlotMinimalTupleExtra().
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Author: Jeff Davis <jdavis@postgresql.org>
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2025-03-24 [626df47ad] Remove 'additional' pointer from TupleHashEntryData.
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-->
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<listitem>
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<para>
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Improve the performance and reduce memory usage of hash joins and GROUP BY (David Rowley, Jeff Davis)
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<ulink url="&commit_baseurl;adf97c156">&sect;</ulink>
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<ulink url="&commit_baseurl;0f5738202">&sect;</ulink>
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<ulink url="&commit_baseurl;4d143509c">&sect;</ulink>
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<ulink url="&commit_baseurl;a0942f441">&sect;</ulink>
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<ulink url="&commit_baseurl;626df47ad">&sect;</ulink>
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</para>
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<para>
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This also improves hash set operations used by EXCEPT, and hash lookups of subplan values.
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</para>
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</listitem>
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<!--
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Author: Melanie Plageman <melanieplageman@gmail.com>
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2025-02-11 [052026c9b] Eagerly scan all-visible pages to amortize aggressive va

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