udim commented on a change in pull request #12654:
URL: https://github.com/apache/beam/pull/12654#discussion_r474766773
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File path: sdks/python/apache_beam/transforms/external.py
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@@ -127,17 +127,21 @@ def _get_named_tuple_instance(self):
for key, value in self._values.items() if value is not None
}
+ # In python 2 named_fields_to_schema will not accept str because its
+ # ambiguous. This converts str hints to ByteString recursively so its clear
+ # we intend to use BYTES.
# TODO(BEAM-7372): Remove coercion to ByteString
def coerce_str_to_bytes(typ):
if typ == str:
return ByteString
elif hasattr(typ, '__args__'):
Review comment:
Probably should also check if `hasattr(typ, '__origin__')` to be safe.
In native_type_compatibility we also check `getattr(typ, '__module__', None)
!= 'typing'` to exclude stuff that's not from the typing module.
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