Log Message:
-----------
Fix the recently-added code that eliminates unnecessary SubqueryScan nodes
from a finished plan tree.  We have to copy the output column names
(resname fields) from the SubqueryScan down to its child plan node;
else, if this is the topmost level of the plan, the wrong column names
will be delivered to the client.  Per bug #2017 reported by Jolly Chen.

Modified Files:
--------------
    pgsql/src/backend/optimizer/plan:
        setrefs.c (r1.115 -> r1.116)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/setrefs.c.diff?r1=1.115&r2=1.116)

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Next:	From: Tom Lane	Date: 2005-11-03 17:45:30
	Subject: pgsql: Thinking further, it seems we had better also copy down
Previous:	From: Alvaro Herrera	Date: 2005-11-03 17:26:04
	Subject: Re: [COMMITTERS] pgsql: Rename the members of CommandDest enum so