On Tue, May 14, 2019 at 12:24 AM Amit Langote
<Langote_Amit_f8@lab.ntt.co.jp> wrote:
> He did mention that cases where the nullable side is provably empty can be
> handled by simply returning the path of the non-nullable side with
> suitable projection path added on top to emit NULLs for the columns of the
> nullable-side. If we teach populate_joinrel_with_paths() and underlings
> about that, then we can allow partitionwise join even in the case where
> the nullable side has some partitions missing.
Yes, I think that would be a good approach to pursue.
--
Robert Haas
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