In 7.4.3, if I rename a column which references another table,
constraint trigger fails on update or delete from main table.
There are a couple of similar (and about rename table itself) reports
for 7.0, 7.1 (as Tom Lane said, rename table is fixed in 7.2), but I
see no more reports since 2001.
Here's a simple reproducible example:
fduch@~=# CREATE TABLE master (k integer NOT NULL PRIMARY KEY) WITHOUT OIDS;
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "master_pkey" for table "master"
CREATE TABLE
fduch@~=# CREATE TABLE slave (ref integer REFERENCES master (k)) WITHOUT OIDS;
CREATE TABLE
fduch@~=# INSERT INTO master VALUES (1);
INSERT 0 1
fduch@~=# INSERT INTO master VALUES (2);
INSERT 0 1
fduch@~=# DELETE FROM master WHERE k = 1;
DELETE 1
fduch@~=# ALTER TABLE slave RENAME ref TO k;
ALTER TABLE
fduch@~=# UPDATE master SET k = 2 where k = 2;
ERROR: table "slave" does not have column "ref" referenced by constraint "$1"
fduch@~=# DELETE FROM master WHERE k = 2;
ERROR: table "slave" does not have column "ref" referenced by constraint "$1"
However triggers themselves look good after rename:
fduch@~=# \d slave
Table "public.slave"
Column | Type | Modifiers
--------+---------+-----------
k | integer |
Foreign-key constraints:
"$1" FOREIGN KEY (k) REFERENCES master(k)
fduch@~=# SELECT * from pg_trigger WHERE tgrelid = (SELECT oid FROM pg_class WHERE relname = 'slave');
tgrelid | tgname | tgfoid | tgtype | tgenabled | tgisconstraint | tgconstrname | tgconstrrelid |
tgdeferrable| tginitdeferred | tgnargs | tgattr | tgargs
---------+----------------------------+--------+--------+-----------+----------------+--------------+---------------+--------------+----------------+---------+--------+----------------------------------------------------
77304 | RI_ConstraintTrigger_77307 | 1644 | 21 | t | t | $1 | 77300 | f
| f | 6 | | $1\000slave\000master\000UNSPECIFIED\000k\000k\000
(1 row)
fduch@~=# SELECT * from pg_trigger WHERE tgrelid = (SELECT oid FROM pg_class WHERE relname = 'master');
tgrelid | tgname | tgfoid | tgtype | tgenabled | tgisconstraint | tgconstrname | tgconstrrelid |
tgdeferrable| tginitdeferred | tgnargs | tgattr | tgargs
---------+----------------------------+--------+--------+-----------+----------------+--------------+---------------+--------------+----------------+---------+--------+----------------------------------------------------
77300 | RI_ConstraintTrigger_77309 | 1655 | 17 | t | t | $1 | 77304 | f
| f | 6 | | $1\000slave\000master\000UNSPECIFIED\000k\000k\000
77300 | RI_ConstraintTrigger_77308 | 1654 | 9 | t | t | $1 | 77304 | f
| f | 6 | | $1\000slave\000master\000UNSPECIFIED\000k\000k\000
(2 rows)
The problem goes away after re-creating the foreign key:
fduch@~=# ALTER TABLE slave DROP CONSTRAINT "$1";
ALTER TABLE
fduch@~=# ALTER TABLE slave ADD CONSTRAINT "$1" FOREIGN KEY (k) REFERENCES master(k);
ALTER TABLE
fduch@~=# DELETE FROM master WHERE k = 2;
DELETE 1
--
Fduch M. Pravking
