From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
Cc: | pgsql-hackers(at)postgresql(dot)org, "Sergey E(dot) Koposov" <math(at)sai(dot)msu(dot)ru> |
Subject: | Re: Do we need multiple forms of the SQL2003 statistics |
Date: | 2006-07-29 23:30:42 |
Message-ID: | 20724.1154215842@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> ... From a mathematician's point of view, however, some of these
> functions normally produce irrational numbers anyway, so it seems
> unlikely that numeric will be useful. But looking at the definition
> of, say, regr_avgx(Y, X), if all the input values are integers, it
> might be useful if I could get an exact integer or rational number as
> output, instead of a float, that is.
The question is whether this is useful enough to justify adding a
thousand lines to numeric.c.
I believe also that the numeric forms of the aggregates will be
enormously slower than the float forms, at least on most modern
machines with decent floating-point performance. I don't have time
to do any performance testing though.
regards, tom lane
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