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Add doc entry for the new GUC paramenter enable_group_by_reordering

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0452b461bc adds alternative orderings of group-by keys during the query
optimization. This new feature is controlled by the new GUC parameter
enable_group_by_reordering, which accidentally came without the documentation.
This commit adds the missing documentation for that GUC.

Reported-by: Bruce Momjian
Discussion: https://postgr.es/m/ZnDx2FYlba_OafQd%40momjian.us
Author: Andrei Lepikhov
Reviewed-by: Pavel Borisov, Alexander Korotkov
This commit is contained in:
Alexander Korotkov 2024-06-21 15:39:13 +03:00
parent fd49e8f323
commit 82e79ee46b
1 changed files with 19 additions and 0 deletions
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19
doc/src/sgml/config.sgml
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@ -5341,6 +5341,25 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
</listitem>
</varlistentry>
<varlistentry id="guc-enable-groupby-reordering" xreflabel="enable_group_by_reordering">
<term><varname>enable_group_by_reordering</varname> (<type>boolean</type>)
<indexterm>
<primary><varname>enable_group_by_reordering</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Controls if the query planner will produce a plan which will provide
<literal>GROUP BY</literal> keys sorted in the order of keys of
a child node of the plan, such as an index scan. When disabled, the
query planner will produce a plan with <literal>GROUP BY</literal>
keys only sorted to match the <literal>ORDER BY</literal> clause,
if any. When enabled, the planner will try to produce a more
efficient plan. The default value is <literal>on</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-enable-hashagg" xreflabel="enable_hashagg">
<term><varname>enable_hashagg</varname> (<type>boolean</type>)
<indexterm>