Add expected tuple descriptor to ReturnSetInfo information for table

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

Commit: 7bacf2befaa5e708ad924dfc7f37844a0013e06f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-08-30T23:59:46Z
Releases: 7.3.1
Add expected tuple descriptor to ReturnSetInfo information for table
functions, per suggestion from John Gray and Joe Conway.  Also, fix
plpgsql RETURN NEXT to verify that returned values match the expected
tupdesc.

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