Fix ALTER TABLE error message

alvherre · alvherre · commit 931a1c023790 · 2025-03-04T20:07:30.000+01:00
This bogus error message was introduced in 2013 by commit f177cbf, because of misunderstanding the processCASbits() API; at the time, no test cases were added that would be affected by this change. Only in ca87c41 was one added (along with a couple of typos), with an XXX note that the error message was bogus. Fix the whole, add some test cases. Backpatch all the way back. Reviewed-by: Nathan Bossart <nathandbossart@gmail.com> Discussion: https://postgr.es/m/202503041822.aobpqke3igvb@alvherre.pgsql
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
@@ -2420,7 +2420,7 @@ alter_table_cmd:
 					n->def = (Node *) c;
 					c->contype = CONSTR_FOREIGN; /* others not supported, yet */
 					c->conname = $3;
-					processCASbits($4, @4, "ALTER CONSTRAINT statement",
+					processCASbits($4, @4, "FOREIGN KEY",
 									&c->deferrable,
 									&c->initdeferred,
 									NULL, NULL, yyscanner);
diff --git a/src/test/regress/expected/foreign_key.out b/src/test/regress/expected/foreign_key.out
@@ -1240,11 +1240,15 @@ DETAIL:  Key (fk)=(20) is not present in table "pktable".
 COMMIT;
 -- try additional syntax
 ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NOT DEFERRABLE;
--- illegal option
+-- illegal options
 ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NOT DEFERRABLE INITIALLY DEFERRED;
 ERROR:  constraint declared INITIALLY DEFERRED must be DEFERRABLE
 LINE 1: ...e ALTER CONSTRAINT fktable_fk_fkey NOT DEFERRABLE INITIALLY ...
                                                              ^
+ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NO INHERIT;
+ERROR:  FOREIGN KEY constraints cannot be marked NO INHERIT
+ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NOT VALID;
+ERROR:  FOREIGN KEY constraints cannot be marked NOT VALID
 -- test order of firing of FK triggers when several RI-induced changes need to
 -- be made to the same row.  This was broken by subtransaction-related
 -- changes in 8.0.
diff --git a/src/test/regress/sql/foreign_key.sql b/src/test/regress/sql/foreign_key.sql
@@ -943,8 +943,10 @@ COMMIT;
 
 -- try additional syntax
 ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NOT DEFERRABLE;
--- illegal option
+-- illegal options
 ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NOT DEFERRABLE INITIALLY DEFERRED;
+ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NO INHERIT;
+ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NOT VALID;
 
 -- test order of firing of FK triggers when several RI-induced changes need to
 -- be made to the same row.  This was broken by subtransaction-related
