From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Michael Glaesemann <grzm(at)seespotcode(dot)net>, Michael Paesold <mpaesold(at)gmx(dot)at>, PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org> |
Subject: | Re: [HACKERS] Interval aggregate regression failure |
Date: | 2006-09-04 01:07:58 |
Message-ID: | 200609040107.k8417wq12601@momjian.us |
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Lists: | pgsql-patches |
Tom Lane wrote:
> Bruce Momjian <bruce(at)momjian(dot)us> writes:
> > Is this non-datetime integer only or both? I cannot reproduce the
> > failure here.
>
> On HPPA with float datetimes with today's code, Michael's case works
> but it took me less than two minutes to find one that doesn't:
>
> regression=# select interval '14 mon' * 8.2 as product_h;
> product_h
> ---------------------------------
> 9 years 6 mons 23 days 24:00:00
> (1 row)
>
> I reiterate my comment that this approach will never work; any small
> amount of experimentation will turn up cases that don't round correctly
> on one platform or another. Float arithmetic is inherently inexact.
Working on a new patch to round; will post.
--
Bruce Momjian bruce(at)momjian(dot)us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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