Re: pgsql/src/backend/optimizer/prep prepunion.c

Tom, thanks for fixing this.  I couldn't verify the bug because the test
case was so complex.

> CVSROOT:    /home/projects/pgsql/cvsroot
> Module name:    pgsql
> Changes by:    tgl@hub.org    01/08/14 13:12:57
>
> Modified files:
>     src/backend/optimizer/prep: prepunion.c
>
> Log message:
>     Fix brokenness of nested EXCEPT/INTERSECT queries.  prepunion was being
>     a tad sloppy about generating the targetlist for some nodes, by generating
>     a tlist entry that claimed to be a constant when the value wasn't actually
>     constant.  This caused setrefs.c to do the wrong thing later on.
>
>
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