HIVE-7636 : cbo fails when no projection is required from aggregate function (Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1616802 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7655: Reading of partitioned table stats slows down explain (Harish Butani via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1616879 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7662: CBO: changes to Cost Model (Harish Butani via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1616882 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7667: handle cast for long in get_aggr_stats() api for metastore for mysql (Ashutosh Chauhan via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1616910 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7670: CBO: predicates on partition columns get applied twice in cardinality estimates. (Harish Butani via Gunther Hagleinter)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1616912 13f79535-47bb-0310-9956-ffa450edef68