Reconsider mechanism for marking sub-selects that are at top level of

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

Commit: 56e1aab286ac841ac9404fc6b1c4f112259b6302
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-01-13T18:10:53Z
Releases: 7.4.1
Reconsider mechanism for marking sub-selects that are at top level of
a qualification clause (and hence can get away with being sloppy about
distinguishing FALSE from UNKNOWN).  We need to know this in subselect.c;
marking the subplans in setrefs.c is too late.

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