HIVE-8309 : CBO: Fix OB by removing constraining DT, Use external names for col Aliases, Remove unnecessary Selects, Make DT Name counter query specific (John Pullokkaran via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1628748 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8236: VectorHashKeyWrapper allocates too many zero sized arrays (Gopal V, reviewed by Prasanth J)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1628767 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8271: Relocate jackson within hive-exec.jar for hadoop-2.4 compat (Gopal V, reviewed by Vikram Dixit)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1628772 13f79535-47bb-0310-9956-ffa450edef68