Hive-2608 Do not require AS a,b,c part in LATERAL VIEW (Navis Ryu via egc)

Submitted by: Navis Ryu	
Reviewed by: Edward Capriolo	


git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1514119 13f79535-47bb-0310-9956-ffa450edef68