HIVE-6688 : Fix groupby_* qfile failures in hadoop-2 (Jason Dere via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1579333 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/trunk@1579403 13f79535-47bb-0310-9956-ffa450edef68