| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com> |
| Cc: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com>, tharakan(at)gmail(dot)com, pgsql-bugs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: BUG #17774: Assert triggered on brin_minmax_multi.c |
| Date: | 2023-02-08 16:05:16 |
| Message-ID: | 3492169.1675872316@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
Dmitry Dolgov <9erthalion6(at)gmail(dot)com> writes:
>> On Wed, Feb 08, 2023 at 10:03:01AM -0500, Tom Lane wrote:
>> I'd believe this argument more readily if the calculation weren't being
>> done in float arithmetic. Since it is, you're at the mercy of roundoff
>> error ... and that small negative delta could certainly pass for
>> roundoff error.
> Hmm...yeah, good point. In both the reproducer I've posted and the
> backtrace from the thread the delta is indeed rather small.
I bet also it only fails when dealing with IPv6 addresses.
With 32-bit IPv4 addresses, a float8 would have enough mantissa
bits that the calculation wouldn't become imprecise.
regards, tom lane
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