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981643dcdb
This case didn't work because columns merged by FULL JOIN USING are represented in the parse tree by COALESCE expressions, and the logic for recognizing a partitionable join failed to match upper-level join clauses to such expressions. To fix, synthesize suitable COALESCE expressions and add them to the nullable_partexprs lists. This is pretty ugly and brute-force, but it gets the job done. (I have ambitions of rethinking the way outer-join output Vars are represented, so maybe that will provide a cleaner solution someday. For now, do this.) Amit Langote, reviewed by Justin Pryzby, Richard Guo, and myself Discussion: https://postgr.es/m/CA+HiwqG2WVUGmLJqtR0tPFhniO=H=9qQ+Z3L_ZC+Y3-EVQHFGg@mail.gmail.com