Increase the mem limit for one of the spilling queries.

Change-Id: I9b52582b2ded82821ecc446762f07d7702dedabf
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4555
Reviewed-by: Nong Li <nong@cloudera.com>
Tested-by: Nong Li <nong@cloudera.com>