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https://issues.apache.org/jira/browse/BEAM-10980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548944#comment-17548944
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Danny McCormick commented on BEAM-10980:
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This issue has been migrated to https://github.com/apache/beam/issues/20554
> Pickling Generated NamedTuple instances drops custom members
> ------------------------------------------------------------
>
> Key: BEAM-10980
> URL: https://issues.apache.org/jira/browse/BEAM-10980
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Brian Hulette
> Priority: P3
>
> 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)
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