HIVE-7158: Use Tez auto-parallelism in Hive (Gunther Hagleitner, reviewed by Lefty, Vikram, Sid and Gopal)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1602327 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7183 : Size of partColumnGrants should be checked in ObjectStore#removeRole() (Suyeon Lee via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1602463 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7226 : Windowing Streaming mode causes NPE for empty partitions (Harish Butani via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1602499 13f79535-47bb-0310-9956-ffa450edef68