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Fix ALTER TABLE error message

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This bogus error message was introduced in 2013 by commit f177cbfe676d,
because of misunderstanding the processCASbits() API; at the time, no
test cases were added that would be affected by this change.  Only in
ca87c415e2fc 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
This commit is contained in:
Álvaro Herrera 2025-03-04 20:07:30 +01:00
parent bacbc4863b
commit 7bbc46213d
No known key found for this signature in database
GPG Key ID: 1C20ACB9D5C564AE
5 changed files with 17 additions and 9 deletions
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2
src/backend/parser/gram.y
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@ -2663,7 +2663,7 @@ alter_table_cmd:
n->def = (Node *) c;
c->conname = $3;
c->alterDeferrability = true;
processCASbits($4, @4, "ALTER CONSTRAINT statement",
processCASbits($4, @4, "FOREIGN KEY",
&c->deferrable,
&c->initdeferred,
NULL, NULL, NULL, yyscanner);

7
src/test/regress/expected/constraints.out
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@ -735,7 +735,7 @@ SELECT * FROM unique_tbl;
3 | threex
(5 rows)
-- enforcibility cannot be specified or set for unique constrain
-- enforceability cannot be specified or set for unique constraint
CREATE TABLE UNIQUE_EN_TBL(i int UNIQUE ENFORCED);
ERROR: misplaced ENFORCED clause
LINE 1: CREATE TABLE UNIQUE_EN_TBL(i int UNIQUE ENFORCED);
@ -744,13 +744,12 @@ CREATE TABLE UNIQUE_NOTEN_TBL(i int UNIQUE NOT ENFORCED);
ERROR: misplaced NOT ENFORCED clause
LINE 1: CREATE TABLE UNIQUE_NOTEN_TBL(i int UNIQUE NOT ENFORCED);
^
-- XXX: error message is misleading here
ALTER TABLE unique_tbl ALTER CONSTRAINT unique_tbl_i_key ENFORCED;
ERROR: ALTER CONSTRAINT statement constraints cannot be marked ENFORCED
ERROR: FOREIGN KEY constraints cannot be marked ENFORCED
LINE 1: ...TABLE unique_tbl ALTER CONSTRAINT unique_tbl_i_key ENFORCED;
^
ALTER TABLE unique_tbl ALTER CONSTRAINT unique_tbl_i_key NOT ENFORCED;
ERROR: ALTER CONSTRAINT statement constraints cannot be marked NOT ENFORCED
ERROR: FOREIGN KEY constraints cannot be marked NOT ENFORCED
LINE 1: ...ABLE unique_tbl ALTER CONSTRAINT unique_tbl_i_key NOT ENFORC...
^
DROP TABLE unique_tbl;

10
src/test/regress/expected/foreign_key.out
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@ -1278,11 +1278,19 @@ 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
LINE 1: ...ER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NO INHERIT...
^
ALTER TABLE fktable ALTER CONSTRAINT fktable_fk_fkey NOT VALID;
ERROR: FOREIGN KEY constraints cannot be marked NOT VALID
LINE 1: ...ER 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
-- changes in 8.0.

3
src/test/regress/sql/constraints.sql
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@ -531,10 +531,9 @@ COMMIT;
SELECT * FROM unique_tbl;
-- enforcibility cannot be specified or set for unique constrain
-- enforceability cannot be specified or set for unique constraint
CREATE TABLE UNIQUE_EN_TBL(i int UNIQUE ENFORCED);
CREATE TABLE UNIQUE_NOTEN_TBL(i int UNIQUE NOT ENFORCED);
-- XXX: error message is misleading here
ALTER TABLE unique_tbl ALTER CONSTRAINT unique_tbl_i_key ENFORCED;
ALTER TABLE unique_tbl ALTER CONSTRAINT unique_tbl_i_key NOT ENFORCED;

4
src/test/regress/sql/foreign_key.sql
View File

@ -970,8 +970,10 @@ 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