test_big_query_write_without_schema might be flaky?

This failed in py 3.6 post commit test: https://builds.apache.org/job/beam_PostCommit_Python36/434/console

18:14:58 ======================================================================
18:14:58 FAIL: test_big_query_write_without_schema (apache_beam.io.gcp.bigquery_write_it_test.BigQueryWriteIntegrationTests)
18:14:58 ----------------------------------------------------------------------
18:14:58 Traceback (most recent call last):
18:14:58 File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python36/src/sdks/python/apache_beam/io/gcp/bigquery_write_it_test.py", line 269, in test_big_query_write_without_schema
18:14:58 write_disposition=beam.io.BigQueryDisposition.WRITE_APPEND))
18:14:58 File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python36/src/sdks/python/apache_beam/pipeline.py", line 427, in _exit_
18:14:58 self.run().wait_until_finish()
18:14:58 File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python36/src/sdks/python/apache_beam/pipeline.py", line 407, in run
18:14:58 self._options).run(False)
18:14:58 File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python36/src/sdks/python/apache_beam/pipeline.py", line 420, in run
18:14:58 return self.runner.run_pipeline(self, self._options)
18:14:58 File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python36/src/sdks/python/apache_beam/runners/direct/test_direct_runner.py", line 51, in run_pipeline
18:14:58 hc_assert_that(self.result, pickler.loads(on_success_matcher))
18:14:58 AssertionError:
18:14:58 Expected: (Expected data is [(b'xyw', datetime.date(2011, 1, 1), datetime.time(23, 59, 59, 999999)), (b'abc', datetime.date(2000, 1, 1), datetime.time(0, 0)), (b'\xe4\xbd\xa0\xe5\xa5\xbd', datetime.date(3000, 12, 31), datetime.time(23, 59, 59)), (b'\xab\xac\xad', datetime.date(2000, 1, 1), datetime.time(0, 0))])
18:14:58 but: Expected data is [(b'xyw', datetime.date(2011, 1, 1), datetime.time(23, 59, 59, 999999)), (b'abc', datetime.date(2000, 1, 1), datetime.time(0, 0)), (b'\xe4\xbd\xa0\xe5\xa5\xbd',