From: Álvaro Herrera Date: Fri, 20 Mar 2026 13:38:50 +0000 (+0100) Subject: SET NOT NULL: Call object-alter hook only after the catalog change X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e7975f1c06b585dcda645c6047e6f37cdfacce84;p=thirdparty%2Fpostgresql.git SET NOT NULL: Call object-alter hook only after the catalog change ... otherwise, the function invoked by the hook might consult the catalog and not see that the new constraint exists. This relies on set_attnotnull doing CommandCounterIncrement() after successfully modifying the catalog. Oversight in commit 14e87ffa5c54. Author: Artur Zakirov Backpatch-through: 18 Discussion: https://postgr.es/m/CAKNkYnxUPCJk-3Xe0A3rmCC8B8V8kqVJbYMVN6ySGpjs_qd7dQ@mail.gmail.com --- diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 8d55acb64a2..219f604df7b 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -8137,12 +8137,12 @@ ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName, ccon = linitial(cooked); ObjectAddressSet(address, ConstraintRelationId, ccon->conoid); - InvokeObjectPostAlterHook(RelationRelationId, - RelationGetRelid(rel), attnum); - /* Mark pg_attribute.attnotnull for the column and queue validation */ set_attnotnull(wqueue, rel, attnum, true, true); + InvokeObjectPostAlterHook(RelationRelationId, + RelationGetRelid(rel), attnum); + /* * Recurse to propagate the constraint to children that don't have one. */