BUG #12752: Regression in ALTER TABLE RENAME COLUMN

The following bug has been logged on the website:

Bug reference:      12752
Logged by:          Gianni Ciolli
Email address:      gianni.ciolli@2ndquadrant.it
PostgreSQL version: 9.4.1
Operating system:   Debian GNU/Linux, testing
Description:

It appears that the bug discussed here has regressed since 9.1:

http://www.postgresql.org/message-id/200110121753.f9CHrnl10542@candle.pha.pa.us

Context information: the bug breaks Londiste, which uses
pg_attribute.attname to match columns on the primary key index with the
corrisponding columns on the table.

I found the bug after a customer reported Londiste issues on a table whose
primary key had been renamed.