On 14 Dec 2013 15:40, "Tom Lane" <t...@sss.pgh.pa.us> wrote:
> David Rowley <dgrowle...@gmail.com> writes:
> > The attached patch is not quite finished yet, I've not yet fully covered
> > SUM and AVG for all types.
> I think you *can't* cover them for the float types; roundoff error
> would mean you don't get the same answers as before.

I was going to say the same thing. But then I started to wonder.... What's
so special about the answers we used to give? They are also subject to
round off and the results are already quite questionable in those cases.

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