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Partitionwise join proposes add a concept of child join relations, which will have the same relationship with join relations as "other member" relations do with base relations. These relations will need some but not all of the handling that we currently have for join relations, and some but not all of the handling that we currently have for appendrels, since they are a mix of the two. Refactor a little bit so that the necessary bits of logic are exposed as separate functions. Ashutosh Bapat, reviewed and tested by Rajkumar Raghuwanshi and by me. Discussion: http://postgr.es/m/CAFjFpRfqotRR6cM3sooBHMHEVdkFfAZ6PyYg4GRZsoMuW08HjQ@mail.gmail.com
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