HIVE-7301 : Restore constants moved to HiveConf by HIVE-7211 (Navis review by Daniel Dai)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1606277 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7302: Allow Auto-reducer parallelism to be turned off by a logical optimizer (Gunther Hagleitner, reviewed by Gopal V and Vikram Dixit K)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1606401 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7063 : Optimize for the Top N within a Group use case (Harish Butani via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1606775 13f79535-47bb-0310-9956-ffa450edef68
HIVE-2597 : Repeated key in GROUP BY is erroneously displayed when using DISTINCT (Navis via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1606780 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7255 : Allow partial partition spec in analyze command (Ashutosh Chauhan via Szehon Ho)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1606928 13f79535-47bb-0310-9956-ffa450edef68
Merge latest trunk into branch. (Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1606964 13f79535-47bb-0310-9956-ffa450edef68