pgsql: If we expect a hash join to be performed in multiple batches,

Log Message:
-----------
If we expect a hash join to be performed in multiple batches, suppress
"physical tlist" optimization on the outer relation (ie, force a projection
step to occur in its scan). This avoids storing useless column values when
the outer relation's tuples are written to temporary batch files.

Modified version of a patch by Michael Henderson and Ramon Lawrence.

Modified Files:
--------------
pgsql/src/backend/nodes:
outfuncs.c (r1.355 -> r1.356)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c?r1=1.355&r2=1.356)
pgsql/src/backend/optimizer/path:
costsize.c (r1.205 -> r1.206)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/costsize.c?r1=1.205&r2=1.206)
pgsql/src/backend/optimizer/plan:
createplan.c (r1.256 -> r1.257)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c?r1=1.256&r2=1.257)
pgsql/src/backend/optimizer/util:
pathnode.c (r1.150 -> r1.151)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/pathnode.c?r1=1.150&r2=1.151)
pgsql/src/include/nodes:
relation.h (r1.170 -> r1.171)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/relation.h?r1=1.170&r2=1.171)