Submitted by: Brock Noland Jonathon Chang	
Reviewed by: Edward Capriolo	
Approved by: Edward Capriolo	


git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1493292 13f79535-47bb-0310-9956-ffa450edef68
update comments
Merge remote-tracking branch 'upstream/trunk' into HIVE-2206-3671-Improvement