BUG #7502: ALTER COLUMN TYPE processed even if column type matches

The following bug has been logged on the website:

Bug reference:      7502
Logged by:          Tigran Mkrtchyan
Email address:      tigran.mkrtchyan@desy.de
PostgreSQL version: 9.1.1
Operating system:   Linux
Description:        =


Hi,

we have notice that =


ALTER TABLE a_table ALTER COLUMN a_column TYPE varchar(36)

will be processed by postgres even if column types matches to the new one.
Technically, this is not an issue, except on big tables ( ~ 30M entries )
takes some time.

Tigran.