HIVE-7509: Fast stripe level merging for ORC (Prasanth J, reviewed by Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1614793 13f79535-47bb-0310-9956-ffa450edef68
Removed files from HIVE-7509 (.5 patch)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1614795 13f79535-47bb-0310-9956-ffa450edef68