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Document lock obtained during partition detach

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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 f56f8f8da6.
Repair.  Backpatch to 12.

Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20210325180244.GA12738@alvherre.pgsql
This commit is contained in:
Alvaro Herrera 2021-03-25 16:30:22 -03:00
parent cc121d5596
commit 650d623530
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doc/src/sgml/ref/alter_table.sgml
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@ -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>