From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | "Sebastian P(dot) Luque" <spluque(at)gmail(dot)com> |
Cc: | Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: custom average window function failure |
Date: | 2016-10-09 20:00:21 |
Message-ID: | 12651.1476043221@sss.pgh.pa.us |
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Lists: | pgsql-general |
"Sebastian P. Luque" <spluque(at)gmail(dot)com> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> On closer inspection, the error is only in the
>> aggregate-used-as-window-function case, not plain aggregation.
> Yes, I see the same phenomenon. Could someone suggest a workaround
> until this is fixed? I'm under the gun to submit output tables and the
> only thing I can think of is a crawling slow loop to step through each
> window twice: once using the plain aggregation and another without just
> get all rows. I highly doubt it will be worthwhile, given it's going to
> be about 1000 iterations, and each one would take about 30-45 min...
Are you in a position to apply patches? It's a one-line fix:
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=dca25c2562199ce1e7e26367613912a8eadbbde8
Alternatively, the problem doesn't manifest when the aggregate transtype
and output type are the same, so you could probably refactor your code
to use plain array_agg and apply the finalfunc separately in the SQL
query.
regards, tom lane
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