| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Neil Conway <neilc(at)samurai(dot)com> |
| Cc: | Dennis Bjorklund <db(at)zigo(dot)dhs(dot)org>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: unsafe floats |
| Date: | 2004-03-10 22:56:18 |
| Message-ID: | 13696.1078959378@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Neil Conway <neilc(at)samurai(dot)com> writes:
> What number would you like 'Infinity'::float4 and 'Infinity'::float8
> to produce? Is this actually useful functionality?
On an IEEE-spec machine, it's highly useful functionality. +Infinity
and -Infinity are special values.
BTW the float4out and float8out routines already cope with NANs and
infinities, so ISTM the input routines should be able to reverse that.
(At the moment you might only be able to get an infinity inside the
system as the result of certain math functions.)
regards, tom lane
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