<p dir="ltr"><br /> On 14 Dec 2013 15:40, "Tom Lane" <<a href="mailto:tgl@sss.pgh.pa.us">tgl@sss.pgh.pa.us</a>>
wrote:<br/> ><br /> > David Rowley <<a href="mailto:dgrowleyml@gmail.com">dgrowleyml@gmail.com</a>>
writes:<br/> > > The attached patch is not quite finished yet, I've not yet fully covered<br /> > > SUM and
AVGfor all types.<br /> ><br /> > I think you *can't* cover them for the float types; roundoff error<br /> >
wouldmean you don't get the same answers as before.<br /><p dir="ltr">I was going to say the same thing. But then I
startedto wonder.... What's so special about the answers we used to give? They are also subject to round off and the
resultsare already quite questionable in those cases.