HIVE-4848 : std, stddev and stddev_pop aggregates on double/float fail to vectorize (Remus Rusanu via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/vectorization@1504216 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4859 : String column comparison classes should be renamed. (Jitendra Nath Pandey via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/vectorization@1504228 13f79535-47bb-0310-9956-ffa450edef68