Marc Lavergne <mlavergne-pub(at)richlava(dot)com> writes:
> If you're asking about whether a custom function can have vararg
> parameters, the answer appears to depend on the CREATE FUNCTION
> syntax.
Can't do it, though you could imagine creating a family of functions
of the same name and different numbers of parameters. Trying to
emulate DECODE this way would have a much worse problem: what's the
datatype of the parameters? (Or the result?)
Use CASE; it does more than DECODE *and* is ANSI-standard.
regards, tom lane