Improve UniquePath logic to detect the case where the input is already

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

Commit: 5c74ce23db52ec862b9f35cfa5f6b327820dda47
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-01-05T18:04:39Z
Releases: 8.0.0
Improve UniquePath logic to detect the case where the input is already
known unique (eg, it is a SELECT DISTINCT ... subquery), and not do a
redundant unique-ification step.

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