Problems renaming referencing column - Mailing list pgsql-bugs

(sorry if it's a dup)

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