kmjung commented on a change in pull request #15185:
URL: https://github.com/apache/beam/pull/15185#discussion_r683710565
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File path: sdks/python/apache_beam/io/gcp/bigquery.py
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@@ -2116,19 +2116,20 @@ class ReadFromBigQuery(PTransform):
on GCS, and then reads from each produced file. File format is Avro by
default.
+ .. warning::
+ DATETIME columns are not supported. They are currently parsed as strings
Review comment:
I believe the issue is that `DATETIME` columns aren't translated to
native Python types, not that they aren't supported at all (they are converted
to strings rather than to native Python datetime types). This is the same as
with Avro file-based exports from BigQuery today:
https://cloud.google.com/bigquery/docs/exporting-data#avro_export_details
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