IMPALA-2327: fix Parquet scanner exit conditions
IMPALA-2327: fix Parquet scanner exit conditions

Change-Id: I14969235702f5dd2edeb3feb332e03fbf2444c18
Reviewed-on: http://gerrit.cloudera.org:8080/1043
Reviewed-by: Skye Wanderman-Milne <6d4b168ab637b0a20cc9dbf96abb2537f372f946@cloudera.com>
Tested-by: Internal Jenkins

cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice