Re: Confused about CASE

["Adam Rich" <adam(dot)r(at)sbcglobal(dot)net>]

> "The data types of all the result expressions must be convertible to a
> single output type."

The type of the field pg_class.relkind appears to be "char" which is
described in the notes as:

The type "char" (note the quotes) is different from char(1) in that it 
only uses one byte of storage. It is internally used in the system catalogs 
as a poor-man's enumeration type.

http://www.postgresql.org/docs/8.3/interactive/datatype-character.html

But one would expect "char" to be "convertible" to text for the purposes
of CASE.  Both implicit and explicit cast to text seems to work fine.