HIVE-8448 : Union All might not work due to the type conversion issue (Yongzhi Chen via Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1632393 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6715 : Hive JDBC should include username into open session request for non-sasl connection (Prasad Mujumdar, reviewed by Vaibhav Gumashta, Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1632419 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8462 CBO duplicates column (Sergey Shelukhin, reviewed by Laljo John Pullokkaran)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1632441 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8390 : CBO produces annoying exception message and wraps exceptions too much (Sergey Shelukhin, reviewed by Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1632444 13f79535-47bb-0310-9956-ffa450edef68