HIVE-7595 : isKerberosMode() does a case sensitive comparison (Sravya Tirukkovalur via Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1615975 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7596 : Cleanup OperatorFactory, ReduceSinkOperator, and reportStats (Brock Noland via Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1615978 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7554 : Parquet Hive should resolve column names in case insensitive manner (Brock Noland via Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1615979 13f79535-47bb-0310-9956-ffa450edef68