Document lock obtained during partition detach

On partition detach, we acquire a SHARE lock on all tables 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.

Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20210325180244.GA12738@alvherre.pgsql

diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 1b633812adb5afa22754660fcff204235057e25a..de80a1901b5da951178241b56e91d0243ab4a635 100644 (file)
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -925,6 +925,8 @@ 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>