HIVE-6264 Unbalanced number of HiveParser msgs.push/msgs.pop calls when doing lookahead (Jason Dere via Harish Butani)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1562640 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6157: Fetching column stats slower than the 101 during rush hour (Sergey Shelukhin via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1562653 13f79535-47bb-0310-9956-ffa450edef68