On 11/10/20 7:15 PM, Tom Lane wrote:
> Tomas Vondra <tomas.vondra@enterprisedb.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
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