Fix problem with whole-row Vars referencing sub-select outputs, per

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

Commit: 599e225c114d74eaf4b5d24190abbb4962948073
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-12-14T16:28:49Z
Releases: 8.1.2
Fix problem with whole-row Vars referencing sub-select outputs, per
example from Jim Dew.  Add some simple regression tests, since this is
an area we seem to break regularly :-(

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