Fix comment about ressortgrouprefs being unique in setop plans.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 10a59925a378bd67aa3834c842dad19de9c5e4c0
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2023-11-28T12:15:14Z
Releases: 17.0
Fix comment about ressortgrouprefs being unique in setop plans.

Author: Richard Guo, Tom Lane
Discussion: https://www.postgresql.org/message-id/CAMbWs49rAfFS-yd7=QxtDUrZDFfRBGy4rGBJNyGDH7=CLipFPg@mail.gmail.com

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PathChange+/−
src/backend/optimizer/plan/setrefs.c modified +8 −1

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