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b718dafc70
Commit 7358abcc60 taught the planner to
store information about Append node consolidation in the final plan,
but it forgot that child_append_relid_sets needs to be adjusted
at setrefs.c time just like every other place where we store RTIs
in a plan tree. Fix that.
Although this can cause incorrect plan advice to be emitted in cases
involving multi-level partitioning, it seems more appropriate to put
the test case for it in pg_overexplain, so this commit does that.
Backpatch-through: 19
Discussion: http://postgr.es/m/CA+TgmoYYHC4i-Gpzc9-JYHqih6pOK+6LTYFiNR-PioXG1nKkOQ@mail.gmail.com