HIVE-4302 : Fix how RowSchema and RowResolver are set on ReduceSinkOp that precedes PTFOp (Harish Butani via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1465408 13f79535-47bb-0310-9956-ffa450edef68