Reading BigQuery Timestamps via python SDK returns error for dates < 1900

[Yatish Gupta]

Hey,

I am getting an exception when running beam on BigQuery rows that contain
Timestamps less than 1900. I get a similar error when using the
DirectRunner.

  File
"/usr/local/lib/python2.7/dist-packages/dataflow_worker/nativebigqueryavroio.py",
line 83, in _fix_field_value
    return dt.strftime('%Y-%m-%d %H:%M:%S.%f UTC')
ValueError: year=1851 is before 1900; the datetime strftime() methods
require year >= 1900

How do I read these rows without changing my schema?

Thanks!