Original coding of 'returning' regression test inadvertently chose a

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

Commit: d2ccc707af4d0eb45b907383f6b274060d1f6e16
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-08-13T17:58:49Z
Releases: 8.2.0
Original coding of 'returning' regression test inadvertently chose a
nonunique join value, leading to plan-choice-dependent results ... and
it seems some platforms will choose a different plan.  Tweak the test
so that it has well-defined results.  Per report from Olivier Prenant.

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