The following bug has been logged on the website:

Bug reference:      7502
Logged by:          Tigran Mkrtchyan
Email address:      tigran.mkrtch...@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.



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