Set ecxt_scantuple correctly for tuple routing.

Robert Haas <rhaas@postgresql.org>

Commit: 132488bfee687865375b5410f18a78fb55bd7015
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-01-24T20:34:39Z
Releases: 10.0
Set ecxt_scantuple correctly for tuple routing.

In 2ac3ef7a01df859c62d0a02333b646d65eaec5ff, we changed things so that
it's possible for a different TupleTableSlot to be used for partitioned
tables at successively lower levels.  If we do end up changing the slot
from the original, we must update ecxt_scantuple to point to the new one
for partition key of the tuple to be computed correctly.

Reported by Rajkumar Raghuwanshi.  Patch by Amit Langote.

Discussion: http://postgr.es/m/CAKcux6%3Dm1qyqB2k6cjniuMMrYXb75O-MB4qGQMu8zg-iGGLjDw%40mail.gmail.com

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