HIVE-7385 : Optimize for empty relation scans (Ashutosh Chauhan via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1611924 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7054 : Support ELT UDF in vectorized mode (Deepesh Khandelwal via Jitendra Nath Pandey)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1611926 13f79535-47bb-0310-9956-ffa450edef68