HIVE-7742: CBO: Predicate Push Down to Honor Hive Join Condition restrictions (Laljo John Pullokkaran via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1618290 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7750: CBO: PPD should Push Predicates on On clause if possible (Laljo John Pullokkaran via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1618308 13f79535-47bb-0310-9956-ffa450edef68