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

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

Commit: 426292663acb30bdd8381eae4058e8ffcbf12162
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-12-14T16:28:32Z
Releases: 8.2.0
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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