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 -- Best regards, Aleksander Alekseev
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