HIVE-9215 : Some mapjoin queries broken with IdentityProjectRemover with PPD (Navis reviewed by Xuefu Zhang and Szehon Ho)
merged from trunk, r1648457

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1648469 13f79535-47bb-0310-9956-ffa450edef68