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test_show_create_table_with_stats is flaky due to inconsistent metadata is not handled/retried correctly in coordinator side. This patch deflake it by retrying if InconsistentMetadataFetchException is caught. This patch also fix some flake8 warnings in test_show_create_table.py, including unused 'vector' parameter in several tests. Testing: Loop and pass test_show_create_table_with_stats 10 times. Change-Id: I397b9502d92bfd756929be8e851661fd9246dd5e Reviewed-on: http://gerrit.cloudera.org:8080/23728 Reviewed-by: Quanlong Huang <huangquanlong@gmail.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>