On Fri, May 26, 2006 at 14:06:29 -0500, "Jim C. Nasby" <jnasby@pervasive.com> wrote:
>
> But if aggregate(*) just gets turned into aggregate(1) by the backend,
> why not just tell people to use aggregate(1) for their custom
> aggregates? Or am I misunderstanding how aggregate(*) is actually
> handled?
>
> My concern is that it's not inconceiveable to typo max(field) into
> max(*), which could make for a rather frustrating error. Not to mention
> this being something that could trip newbies up. If nothing else I'd say
> it warrants a %TODO just so it doesn't end up on the PostgreSQL gotcha's
> page. :)
Tom's suggestion that (*) map to () which would refer to a zero argument
aggregate would cover this case, since there wouldn't be a zero argument
version of max.