This patch also does some clean up on agg-fn-evaluator to support this case. Change-Id: If7e5c8663c7d371b2666acaab2966a2cd7bdccf9 Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4256 Tested-by: jenkins Reviewed-by: Nong Li <nong@cloudera.com>