Fix ExecReScanGatherMerge.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: de1ca6919ff8f50e09122a1001eee1420b047199
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-08-17T17:49:31Z
Releases: 10.0
Fix ExecReScanGatherMerge.

Not surprisingly, since it'd never ever been tested, ExecReScanGatherMerge
didn't work.  Fix it, and add a regression test case to exercise it.

Amit Kapila

Discussion: https://postgr.es/m/CAA4eK1JkByysFJNh9M349u_nNjqETuEnY_y1VUc_kJiU0bxtaQ@mail.gmail.com

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