proposal for 8.4: PL/pgSQL - statement CASE

Hello

I found so PL/SQL support CASE statement
http://download-east.oracle.com/docs/cd/B10500_01/appdev.920/a96624/04_struc.htm#484

I propose add this statement to PL/pgSQL too.

Reasons:

a) it's useful construct,
b) this statement is defined in SQL/PSM - better conformance with ANSI

Implementation:
This statement is implemented in PL/pgPSM, so implementation will be
backported to PL/pgSQL.

Any ideas?

Regards
Pavel Stehule