From 02c0192816f5247a5fc71a5ad59f28306fb56080 Mon Sep 17 00:00:00 2001 From: David Rowley Date: Mon, 31 Mar 2025 12:02:55 +1300 Subject: [PATCH v17] Doc: add information about partition locking 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 Discussion: https://postgr.es/m/CAApHDvp738G75HfkKcfXaf3a8s%3D6mmtOLh46tMD0D2hAo1UCzA%40mail.gmail.com Backpatch-through: 12 --- doc/src/sgml/ddl.sgml | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml index c150dd217f9..bef12758711 100644 --- a/doc/src/sgml/ddl.sgml +++ b/doc/src/sgml/ddl.sgml @@ -4986,7 +4986,9 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2008-01-01'; It is possible to determine the number of partitions which were removed during this phase by observing the Subplans Removed property in the - EXPLAIN output. + EXPLAIN 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. -- 2.40.1.windows.1