BUG #5514: no relation entry for relid X

The following bug has been logged online:

Bug reference: 5514
Logged by: Marcos Castedo
Email address: marcos.castedo@anachronics.com
PostgreSQL version: 8.4.4
Operating system: GNU/Linux
Description: no relation entry for relid X
Details:

Hi,

I'm getting an error in some kind of SQL expression (subquery referencing a
tuple from parent expression).
This error raise in 8.4.x version of postgres, but previous version (8.3.x)
execute the expression correctly.

Examples:

CREATE TABLE table_a
(
id integer primary key
);

CREATE VIEW view_a as select * FROM table_a;

SELECT (SELECT view_a) FROM view_a;

PostgreSQL 8.3.9 (works fine):

postgres=# SELECT (SELECT view_a) FROM view_a;
?column?
----------
(0 rows)

postgres=# INSERT INTO table_a VALUES (1);

postgres=# SELECT (SELECT view_a.*) FROM view_a;
?column?
----------
1

postgres=# SELECT (SELECT (view_a.*)::text) FROM view_a;
?column?
----------
(1)
(1 row)

PostgreSQL 8.4.4 (ERROR: no relation entry for relid x):

postgres=# SELECT (SELECT view_a) FROM view_a;
ERROR: no relation entry for relid 1

postgres=# INSERT INTO table_a VALUES (1);

postgres=# SELECT (SELECT (view_a.*)::text) FROM view_a;
ERROR: no relation entry for relid 1

postgres=# SELECT (SELECT view_a.*) FROM view_a;
?column?
----------
1

postgres=# SELECT (SELECT (a.*)::text) FROM view_a a;
ERROR: no relation entry for relid 1

Best regards