On Sep 1, 2010, at 10:12 AM, Tom Lane wrote:
> I think when that text was written, it was meant to imply "all the
> aggregates defined in SQL92". There seems to be a lot of confusion
> in this thread about whether "standard" means "defined by SQL spec"
> or "built-in in Postgres". Should we try to refine the wording to
> clarify that?
Yes please.
> Even more to the point, should we deliberately make this vaguer so that
> we aren't finding ourselves with obsolete text again and again? You can
> bet that people adding new aggregates in the future aren't going to
> think to update this sentence, any more than happened with array_agg.
Perhaps “consult the docs for each aggregate to determine how it handles NULLs.”
Best,
David
