HIVE-3472 : add Date data type (Jason Dere via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1507713 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4929 : the type of all numeric constants is changed to double in the plan (Sergey Shelukhin via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1507724 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd