case with distinct - Mailing list pgsql-bugs

This works:
    select
            orgid,
            case when status = 'y' then '1' else '0' end
            from vend


This doesn't:
     select distinct
            orgid,
            case when status = 'y' then '1' else '0' end
            from vend

The only difference is the absence of distinct clause.
bug?