pgsql: Teach btree to handle ScalarArrayOpExpr quals natively.

Teach btree to handle ScalarArrayOpExpr quals natively.

This allows "indexedcol op ANY(ARRAY[...])" conditions to be used in plain
indexscans, and particularly in index-only scans.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/9e8da0f75731aaa7605cf4656c21ea09e84d2eb1

Modified Files
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doc/src/sgml/catalogs.sgml | 7 +
src/backend/access/nbtree/nbtree.c | 149 +++++++----
src/backend/access/nbtree/nbtutils.c | 457 ++++++++++++++++++++++++++++++++-
src/backend/executor/nodeIndexscan.c | 75 +++++-
src/backend/optimizer/path/costsize.c | 11 +-
src/backend/optimizer/path/indxpath.c | 49 +++--
src/backend/optimizer/util/plancat.c | 1 +
src/backend/utils/adt/selfuncs.c | 7 -
src/include/access/nbtree.h | 19 ++
src/include/access/skey.h | 23 ++-
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_am.h | 50 ++--
src/include/nodes/relation.h | 3 +-
13 files changed, 725 insertions(+), 128 deletions(-)