Fix ExecMakeTableFunctionResult() to work with generic expressions as

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

Commit: 02f8c9a38297459c2664044ea6d98d91678a4d79
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-12-01T20:27:32Z
Releases: 7.4.1
Fix ExecMakeTableFunctionResult() to work with generic expressions as
well as function calls.  This is needed for cases where the planner has
constant-folded or inlined the original function call.  Possibly we should
back-patch this change into 7.3 branch as well.

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