HIVE-6848 importing into an existing table fails (Harish Butani via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1585326 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6834 Dynamic partition optimization bails out after removing file sink operator (Prasanth J via Harish Butani)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1585332 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6840: Use Unordered Output for Bucket Map Joins on Tez (Siddharth Seth via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1585359 13f79535-47bb-0310-9956-ffa450edef68