Re: [HACKERS] case bug?

Tatsuo Ishii <t-ishii@sra.co.jp> writes:
> Following case statement is legal but fails in 6.5.1.
> select i,
>   case
>     when i < 0 then 'minus'
>     when i = 0 then 'zero'
>     when i > 0 then  'plus'
>     else null
>   end
> from t1;
> ERROR:  Unable to locate type oid 0 in catalog

Still there in current sources, too.  Looks like it's the "else null"
that triggers the problem --- probably the code that is resolving the
final output type of the CASE expression isn't coping with a null.

I think this is Lockhart's turf, but I can have a go at it if he hasn't
got time to work on it...
        regards, tom lane