v2-0001-Add-doc-entry-for-the-new-GUC-paramenter-enable_g.patch

From f44436b9ebd3f63cdd4d1d3e1b46a8f660e5edac Mon Sep 17 00:00:00 2001
From: Alexander Korotkov <akorotkov@postgresql.org>
Date: Tue, 18 Jun 2024 15:08:17 +0300
Subject: [PATCH v2] Add doc entry for the new GUC paramenter
 enable_group_by_reordering

0452b461bc4 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
---
 doc/src/sgml/config.sgml | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 698169afdb6..d45cb02ad15 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -5327,6 +5327,24 @@ 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>
+        Enables or disables the reordering of keys in a
+        <literal>GROUP BY</literal> clause to match the ordering keys of a
+        child node of the plan, such as an index scan. When turned off, keys
+        in a <literal>GROUP BY</literal> clause are only reordered to match
+        the <literal>ORDER BY</literal> clause, if any. The default is
+        <literal>on</literal>.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-enable-gathermerge" xreflabel="enable_gathermerge">
       <term><varname>enable_gathermerge</varname> (<type>boolean</type>)
       <indexterm>
-- 
2.39.3 (Apple Git-145)