| From: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Russell Foster <russell(dot)foster(dot)coding(at)gmail(dot)com>, Ranier Vilela <ranier(dot)vf(at)gmail(dot)com>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Windows regress fails (latest HEAD) |
| Date: | 2020-11-10 18:52:48 |
| Message-ID: | 85508ddd-613c-dd26-cff1-845f6175ff61@enterprisedb.com |
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| Lists: | pgsql-hackers |
On 11/10/20 7:15 PM, Tom Lane wrote:
> Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> writes:
>> That's unlikely, I think. The regression tests are constructed so that
>> the estimates are stable. It's more likely this is some difference in
>> rounding behavior, for example.
>
> The reported delta is in the actual row count, not an estimate.
> How could that be subject to roundoff issues? And there's no
> delta in the Append's inputs, so this seems like it's a flat-out
> miss of a row count in EXPLAIN ANALYZE.
>
My bad. I've not noticed it's EXPLAIN ANALYZE (COSTS OFF) so I thought
it's estimates. You're right this can't be a roundoff error.
>> I wonder which msvc builds are used on the machines that fail/pass
>> the tests, and if the compiler flags are the same.
>
> Yeah, this might be a fruitful way to figure out "what's different
> from the buildfarm".
>
Yeah. Also Russell claims to have two "same" machines out of which one
works and the other one fails.
regards
--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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