[COMMITTERS] pgsql: Refactor get_partition_for_tuple a bit.

Refactor get_partition_for_tuple a bit.

Pending patches for both default partitioning and hash partitioning
find the current coding pattern to be inconvenient.  Change it so that
we switch on the partitioning method first and then do whatever is
needed.

Amul Sul, reviewed by Jeevan Ladhe, with a few adjustments by me.

Discussion: http://postgr.es/m/CAAJ_b97mTb=dG2pv6+1ougxEVZFVnZJajW+0QHj46mEE7WsoOQ@mail.gmail.com
Discussion: http://postgr.es/m/CAOgcT0M37CAztEinpvjJc18EdHfm23fw0EG9-36Ya=+rEFUqaQ@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/f0a0c17c1b126882a37ec6bf42ab45a963794c3e

Modified Files
--------------
src/backend/catalog/partition.c | 100 +++++++++++++++++++++-------------------
1 file changed, 52 insertions(+), 48 deletions(-)


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