robertwb commented on code in PR #23739:
URL: https://github.com/apache/beam/pull/23739#discussion_r999964603
##########
sdks/python/apache_beam/typehints/schemas.py:
##########
@@ -463,19 +463,20 @@ def named_tuple_from_schema(self, schema:
schema_pb2.Schema) -> type:
# Define a reduce function, otherwise these types can't be pickled
# (See BEAM-9574)
- def __reduce__(self):
- return (
- _hydrate_namedtuple_instance,
- (schema.SerializeToString(), tuple(self)))
-
- setattr(user_type, '__reduce__', __reduce__)
+ setattr(user_type, '__reduce__', _named_tuple_reduce)
Review Comment:
It's a little deeper than that. Cloud Pickle was trying to pickle the
`__reduce__` method of this custom type itself. (Another way to put it,
instances of this class pickled fine, but if you ever had a reference to the
class itself that caused issues.)
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