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This patch implement building exec summary table for ImpylaHS2Connection. It adds fetch_exec_summary argument in ImpalaConnection.execute(). If this argument is True, an exec summary table will be added into the returned result object. fetch_exec_summary is also implemented for BeeswaxConnection. Thus, BeeswaxConnection will not fetch exec summary by default all the time. Tests that validate exec summary table is updated to set fetch_exec_summary=True and migrated to test against hs2 protocol. Change TestExecutorGroup._set_query_options() to do query option setting through hs2_client iconfig instead of SET query. Some flake8 issues are addressed as well. Move build_exec_summary_table to separate exec_summary.py file. Tweak it a bit to return early if given TExecSummary is empty. Fixed bug in ImpalaBeeswaxClient.fetch_results() where fetch will not happen at all if discard_result argument is True. Testing: - Run and pass affected tests locally. Change-Id: I7d88f78e58eeda29ce21e7828884c7a129d7efe6 Reviewed-on: http://gerrit.cloudera.org:8080/22626 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>