pgsql: Sup****t ha****ng for duplicate-elimination in INTERSECT and EXCEPT

Log Message:
-----------
Sup****t ha****ng for duplicate-elimination in INTERSECT and EXCEPT queries.
This completes my project of improving usage of ha****ng for duplicate
elimination (aggregate functions with DISTINCT remain undone, but that's
for some other day).

As with the previous patches, this means we can INTERSECT/EXCEPT on
datatypes
that can hash but not sort, and it means that INTERSECT/EXCEPT without
ORDER
BY are no longer certain to produce sorted output.

Modified Files:
--------------
    pgsql/src/backend/commands:
        explain.c (r1.175 -> r1.176)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/explain.c?r1=1.175&r2=1.176)
    pgsql/src/backend/executor:
        nodeSetOp.c (r1.25 -> r1.26)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeSetOp.c?r1=1.25&r2=1.26)
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.397 -> r1.398)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c?r1=1.397&r2=1.398)
        outfuncs.c (r1.331 -> r1.332)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c?r1=1.331&r2=1.332)
    pgsql/src/backend/optimizer/plan:
        createplan.c (r1.242 -> r1.243)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c?r1=1.242&r2=1.243)
    pgsql/src/backend/optimizer/prep:
        prepunion.c (r1.150 -> r1.151)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepunion.c?r1=1.150&r2=1.151)
    pgsql/src/include/nodes:
        execnodes.h (r1.185 -> r1.186)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/execnodes.h?r1=1.185&r2=1.186)
        plannodes.h (r1.100 -> r1.101)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/plannodes.h?r1=1.100&r2=1.101)
    pgsql/src/include/optimizer:
        planmain.h (r1.108 -> r1.109)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/planmain.h?r1=1.108&r2=1.109)
    pgsql/src/test/regress/expected:
        union.out (r1.12 -> r1.13)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/union.out?r1=1.12&r2=1.13)
    pgsql/src/test/regress/sql:
        union.sql (r1.7 -> r1.8)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/union.sql?r1=1.7&r2=1.8)

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