| From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
|---|---|
| To: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Rounding to even for numeric data type |
| Date: | 2015-03-28 09:01:43 |
| Message-ID: | CAEZATCWUHcUmiwFBRKWUpgfeMmtPGUADDG4OouefUVum8=5P1Q@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 28 March 2015 at 05:16, Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> wrote:
>>>>>> "Tom" == Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
>
> Tom> I think the concern over backwards compatibility here is probably
> Tom> overblown; but if we're sufficiently worried about it, a possible
> Tom> compromise is to invent a numeric_rounding_mode GUC, so that
> Tom> people could get back the old behavior if they really care.
>
> I only see one issue with this, but it's a nasty one: do we really want
> to make all numeric operations that might do rounding stable rather than
> immutable?
>
Yeah, making all numeric functions non-immutable seems like a really bad idea.
Regards,
Dean
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