[COMMITTERS] pgsql: Set partitioned_rels appropriately when UNION ALL is used.

Set partitioned_rels appropriately when UNION ALL is used.

In most cases, this omission won't matter, because the appropriate
locks will have been acquired during parse/plan or by AcquireExecutorLocks.
But it's a bug all the same.

Report by Ashutosh Bapat.  Patch by me, reviewed by Amit Langote.

Discussion: http://postgr.es/m/CAFjFpRdHb_ZnoDTuBXqrudWXh3H1ibLkr6nHsCFT96fSK4DXtA@mail.gmail.com

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/448aa36e8b969da257bb58a6fe3db6498d48d4e8

Modified Files
--------------
src/backend/optimizer/path/allpaths.c | 42 +++++++++++++++++++++++++++++++----
src/backend/optimizer/plan/planner.c  |  6 ++---
2 files changed, 40 insertions(+), 8 deletions(-)


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