HIVE-7369: Support agg distinct function with GB (Laljo John Pullokkaran via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1609586 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7388: Remove non-ascii char from comments (Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1609620 13f79535-47bb-0310-9956-ffa450edef68