From 98c0fe1d22333ea4ec27256f9c4dda98b1166b65 Mon Sep 17 00:00:00 2001
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Thu, 25 Mar 2021 14:53:21 -0300
Subject: [PATCH] Document lock obtained during partition detach

We acquire a SHARE lock all table that reference the partitioned table
that we're detaching a partition from, but failed to document this fact.
My oversight in commit f56f8f8da6af.  Repair.  Backpatch to 12.
---
 doc/src/sgml/ref/alter_table.sgml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 0bd0c1a503..cd56d6a17e 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -962,6 +962,8 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       ties to the table from which it was detached.  Any indexes that were
       attached to the target table's indexes are detached.  Any triggers that
       were created as clones of those in the target table are removed.
+      <literal>SHARE</literal> lock is obtained on any tables that reference
+      this partitioned table in foreign key constraints.
      </para>
     </listitem>
    </varlistentry>
-- 
2.20.1