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Doc: add information about partition locking

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The documentation around locking of partitions for the executor startup
phase of run-time partition pruning wasn't clear about which partitions
were being locked.  Fix that.

Reviewed-by: Tender Wang <tndrwang@gmail.com>
Discussion: https://postgr.es/m/CAApHDvp738G75HfkKcfXaf3a8s%3D6mmtOLh46tMD0D2hAo1UCzA%40mail.gmail.com
Backpatch-through: 13
This commit is contained in:
David Rowley 2025-04-02 14:03:48 +13:00
parent 5672a83997
commit e962d6d12b
1 changed files with 3 additions and 1 deletions
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doc/src/sgml/ddl.sgml
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@ -4986,7 +4986,9 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate &gt;= DATE '2008-01-01';
It is possible to determine the number of partitions which were
removed during this phase by observing the
<quote>Subplans Removed</quote> property in the
<command>EXPLAIN</command> output.
<command>EXPLAIN</command> output. It's important to note that any
partitions removed by the partition pruning done at this stage are
still locked at the beginning of execution.
</para>
</listitem>