HIVE-6658 : Modify Alter_numbuckets* test to reflect hadoop2 changes(Laljo John Pullokkaran via Jason Dere)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1579273 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6690 : NPE in tez session state (Sergey Shelukhin, reviewed by Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1579296 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6688 : Fix groupby_* qfile failures in hadoop-2 (Jason Dere via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1579334 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6613: Control when spcific Inputs / Outputs are started (Siddharth Seth via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1579408 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6645 : to_date()/to_unix_timestamp() fail with NPE if input is null (Jason Dere via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1579501 13f79535-47bb-0310-9956-ffa450edef68