From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-patches(at)postgresql(dot)org |
Subject: | Re: Numeric 508 datatype |
Date: | 2005-12-02 18:42:40 |
Message-ID: | 200512021842.jB2Igeh00374@candle.pha.pa.us |
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Lists: | pgsql-general pgsql-hackers pgsql-patches |
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > I am confused by your use of the term "dynamic" range. From what you
> > say above that we are just moving from 1000 to 508 for storage, and that
> > computational range would still be 4096?
>
> No, computational range would still be on the order of 10^16G ... in the
> computational format, the weight is an int. The restriction to 1000
> digits was never anything but an artificial limit. (Of course, you
> might not have the patience to actually do any arithmetic with that many
> digits, but the point is there was a whole lot of headroom before, and
> now there won't be.)
Sorry, I am confused. If our computational range is that high, why does
SELECT factorial(4000) and SELECT factorial(6000) produce the same
number of digits on my screen.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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