BUG #4147: pg_constraint table data retrieval error

The following bug has been logged online:

Bug reference: 4147
Logged by: Arun J M
Email address: arun(dot)jaganathan(at)alliedgroups(dot)com
PostgreSQL version: 8.3
Operating system: Windows XP Pro SP2
Description: pg_constraint table data retrieval error
Details:

While we are retrieving the values from the Pg_constraint table using the
confkey column as mentioned below the query returns the null value, But it
should return the appropriate value from the small int array..

Executed Query:

select pg_constraint.confkey[1] from pg_catalog.pg_constraint

Expected Result:

{1}
{111}
{444}

Result Obtained:

Null values

This is not working on pgadmin/sql , psql , phpadmin/sql.

But the same query is working while executing from php code.