BUG #12752: example SQL

Please find below some code that reproduces the bug.

In the report I was off by one: on my system the bug can be reproduced
on 9.0 or later, but not on 8.4. Sorry for the mistake!

Best wishes,
Dr. Gianni Ciolli - 2ndQuadrant Italia
PostgreSQL Training, Services and Support
gianni.ciolli@2ndquadrant.it | www.2ndquadrant.it

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gianni=# CREATE TABLE t(oldname int primary key);
CREATE TABLE

gianni=# ALTER TABLE t rename column oldname to newname;
ALTER TABLE

gianni=# \d t_pkey
     Index "public.t_pkey"
 Column  |  Type   | Definition
---------+---------+------------
 oldname | integer | newname
primary key, btree, for table "public.t"

gianni=# SELECT attname FROM pg_attribute WHERE attrelid = regclass 't_pkey';
 attname
---------
 oldname
(1 row)