Pickling Generated NamedTuple instances drops custom members
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bug
core
P3
python
- Dominant language
- Java
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Description
We assign a custom `__reduce__` method and a `_beam_schema_id` member to generated NamedTuple instances, but these methods are dropped when the constructor is pickled and unpickled (as might happen when used in a closure with beam.Map or beam.FlatMap)
Imported from Jira [BEAM-10980](https://issues.apache.org/jira/browse/BEAM-10980). Original Jira may contain additional context.
Reported by: bhulette.
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