diff options
Diffstat (limited to 'src/backend/commands/tablecmds.c')
| -rw-r--r-- | src/backend/commands/tablecmds.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 991bc946ffc..b8837f26cb4 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -15415,9 +15415,12 @@ ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode) /* * Re-parse the index and constraint definitions, and attach them to the * appropriate work queue entries. We do this before dropping because in - * the case of a FOREIGN KEY constraint, we might not yet have exclusive - * lock on the table the constraint is attached to, and we need to get - * that before reparsing/dropping. + * the case of a constraint on another table, we might not yet have + * exclusive lock on the table the constraint is attached to, and we need + * to get that before reparsing/dropping. (That's possible at least for + * FOREIGN KEY, CHECK, and EXCLUSION constraints; in non-FK cases it + * requires a dependency on the target table's composite type in the other + * table's constraint expressions.) * * We can't rely on the output of deparsing to tell us which relation to * operate on, because concurrent activity might have made the name @@ -15433,7 +15436,6 @@ ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode) Form_pg_constraint con; Oid relid; Oid confrelid; - char contype; bool conislocal; tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId)); @@ -15450,7 +15452,6 @@ ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode) elog(ERROR, "could not identify relation associated with constraint %u", oldId); } confrelid = con->confrelid; - contype = con->contype; conislocal = con->conislocal; ReleaseSysCache(tup); @@ -15468,12 +15469,12 @@ ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode) continue; /* - * When rebuilding an FK constraint that references the table we're - * modifying, we might not yet have any lock on the FK's table, so get - * one now. We'll need AccessExclusiveLock for the DROP CONSTRAINT - * step, so there's no value in asking for anything weaker. + * When rebuilding another table's constraint that references the + * table we're modifying, we might not yet have any lock on the other + * table, so get one now. We'll need AccessExclusiveLock for the DROP + * CONSTRAINT step, so there's no value in asking for anything weaker. */ - if (relid != tab->relid && contype == CONSTRAINT_FOREIGN) + if (relid != tab->relid) LockRelationOid(relid, AccessExclusiveLock); ATPostAlterTypeParse(oldId, relid, confrelid, |