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Re: [PATCH] Negative Transition Aggregate Functions (WIP) - Mailing list pgsql-hackers

From Greg Stark
Subject Re: [PATCH] Negative Transition Aggregate Functions (WIP)
Date
Msg-id CAM-w4HNdTRBViZWH=VJAdvt5NYgQH6Nc=GyMBBkZwQH19Au8Ag@mail.gmail.com
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In response to Re: [PATCH] Negative Transition Aggregate Functions (WIP)  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: [PATCH] Negative Transition Aggregate Functions (WIP)
Re: [PATCH] Negative Transition Aggregate Functions (WIP)
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<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.

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