| From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Lætitia Avrot <laetitia(dot)avrot(at)gmail(dot)com> |
| Subject: | Re: pgsql: Add support for hyperbolic functions, as well as log10(). |
| Date: | 2019-03-14 08:28:16 |
| Message-ID: | CAEZATCVOhaAjPwmBideyiu-W7QUH=W1j2UAVmTP0fJqKDbLpWQ@mail.gmail.com |
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On Thu, 14 Mar 2019 at 04:41, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
> > I'm amazed that jacana's asinh() returned -0 for an input of +0.
>
> Even more amusingly, it returns NaN for acosh('infinity'), cf
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=jacana&dt=2019-03-14%2003%3A00%3A34
>
> Presumably that means they calculated "infinity - infinity" at some
> point, but why?
>
Given the -0 result, I don't find that particularly surprising. I
suspect lots of formulae would end up doing that without proper
special-case handling upfront.
It looks like that's the only platform that isn't POSIX compliant
though, so maybe it's not worth worrying about.
Regards,
Dean
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