Hi, Robert.
> I'm a little worried that this will be noticeably slower when the
> number of partitions is small, like 4 or 8 or 16. In other places,
> we've found it necessary to support both a list-based strategy and a
> hash-based strategy to avoid regressing small cases (e.g.
> join_rel_list + join_rel_hash in PlannerInfo, ResourceArray in
> resowner.c, etc).
I've checked it [1]. Apparently in this particular case patches make code
faster on small amount of partitions as well.
[1] https://postgr.es/m/20170324132258.GB16830%40e733.localdomain
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Best regards,
Aleksander Alekseev
