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If the Impala server has an older version that does not contain IMPALA-12048 then TExecProgress.total_fragment_instances will be None, leading to error when checking total_fragment_instances > 0. Note that this issue only comes with Python 3, in Python 2 None > 0 returns False. Testing: - Manually checked with a modified Impala that doesn't set total_fragment_instances. Only the scanner progress bar is shown in this case. Change-Id: Ic6562ff6c908bfebd09b7612bc5bcbd92623a8e6 Reviewed-on: http://gerrit.cloudera.org:8080/21256 Reviewed-by: Michael Smith <michael.smith@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Zihao Ye <eyizoha@163.com>