HIVE-4959 : Vectorized plan generation should be added as an optimization transform. (Jitendra Nath Pandey via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/vectorization@1519788 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5152 : Vector operators should inherit from non-vector operators for code re-use. (Jitendra Nath Pandey via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/vectorization@1519797 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5187 : Enhance explain to indicate vectorized execution of operators. (Jitendra Nath Pandey via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/vectorization@1519833 13f79535-47bb-0310-9956-ffa450edef68