Fix a number of places that made faulty assumptions about

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

Commit: dec354ca9769d21a526867ad7636a078dd6ff386
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 1999-02-15T01:06:59Z
Releases: 7.1.1
Fix a number of places that made faulty assumptions about
what is_opclause will accept.

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