From 842c9b27057e8ecea02b816e3ec6c208779b3d39 Mon Sep 17 00:00:00 2001
From: Alexander Korotkov <akorotkov@postgresql.org>
Date: Tue, 30 Apr 2024 11:54:56 +0300
Subject: [PATCH] Document the way partition MERGE/SPLIT operations create new
 partitions

Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/ZilrByTp-pbz6Mvf%40pryzbyj2023
Reviewed-by: Justin Pryzby
---
 doc/src/sgml/ref/alter_table.sgml | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index fe36ff82e5..fc2dfffe49 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -1153,6 +1153,12 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       splitting we have a partition with the same name).
       Only simple, non-partitioned partition can be split.
      </para>
+     <para>
+      The new partitions will be created the same as tables created with the
+      SQL command <literal>CREATE TABLE <replaceable class="parameter">partition_nameN</replaceable> (LIKE <replaceable class="parameter">name</replaceable> INCLUDING ALL EXCLUDING INDEXES EXCLUDING IDENTITY)</literal>.
+      The indexes and identity are created later, after moving the data
+      into the new partitions.
+     </para>
      <note>
       <para>
        This command acquires an <literal>ACCESS EXCLUSIVE</literal> lock.
@@ -1213,6 +1219,12 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       can have the same name as one of the merged partitions.  Only simple,
       non-partitioned partitions can be merged.
      </para>
+     <para>
+      The new partition will be created the same as a table created with the
+      SQL command <literal>CREATE TABLE <replaceable class="parameter">partition_name</replaceable> (LIKE <replaceable class="parameter">name</replaceable> INCLUDING ALL EXCLUDING INDEXES EXCLUDING IDENTITY)</literal>.
+      The indexes and identity are created later, after moving the data
+      into the new partition.
+     </para>
      <note>
       <para>
        This command acquires an <literal>ACCESS EXCLUSIVE</literal> lock.