pgsql: Extend abbreviated key infrastructure to datum tuplesorts.

Extend abbreviated key infrastructure to datum tuplesorts.

Andrew Gierth, reviewed by Peter Geoghegan and by me.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/78efd5c1edb59017f06ef96773e64e6539bfbc86

Modified Files
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src/backend/executor/nodeAgg.c         |    4 -
src/backend/utils/adt/orderedsetaggs.c |    4 -
src/backend/utils/sort/tuplesort.c     |  134 ++++++++++++++++++++++++--------
3 files changed, 101 insertions(+), 41 deletions(-)