HIVE-4214 : OVER accepts general expression instead of just function (Ashutosh Chauhan Reviewed by Harish Butani)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1516180 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4588 : Support session level hooks for HiveServer2 (Prasad Mujumdar via Navis)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1517107 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4963 : Support in memory PTF partitions (Harish Butani via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1517236 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk', remote-tracking branch 'upstream/trunk' into trunk