Re: custom average window function failure

"Sebastian P. Luque" <spluque@gmail.com> writes:
> Tom Lane <tgl@sss.pgh.pa.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