diff options
Diffstat (limited to 'src/backend/utils/adt/ri_triggers.c')
| -rw-r--r-- | src/backend/utils/adt/ri_triggers.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/backend/utils/adt/ri_triggers.c b/src/backend/utils/adt/ri_triggers.c index 7bc1ab1e812..5ef1563d1c9 100644 --- a/src/backend/utils/adt/ri_triggers.c +++ b/src/backend/utils/adt/ri_triggers.c @@ -2608,8 +2608,11 @@ RI_FKey_keyequal_upd_fk(Trigger *trigger, Relation fk_rel, * This is not a trigger procedure, but is called during ALTER TABLE * ADD FOREIGN KEY to validate the initial table contents. * - * We expect that a ShareRowExclusiveLock or higher has been taken on rel and pkrel; - * hence, we do not need to lock individual rows for the check. + * We expect that the caller has made provision to prevent any problems + * caused by concurrent actions. This could be either by locking rel and + * pkrel at ShareRowExclusiveLock or higher, or by otherwise ensuring + * that triggers implementing the checks are already active. + * Hence, we do not need to lock individual rows for the check. * * If the check fails because the current user doesn't have permissions * to read both tables, return false to let our caller know that they will |