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https://issues.apache.org/jira/browse/BEAM-13061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17549629#comment-17549629
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Danny McCormick commented on BEAM-13061:
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This issue has been migrated to https://github.com/apache/beam/issues/21204
> Introduce Union type coder
> --------------------------
>
> Key: BEAM-13061
> URL: https://issues.apache.org/jira/browse/BEAM-13061
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Ihor Indyk
> Priority: P3
> Labels: types
>
> Union[...] type hint seems to be encoded as Any at this moment, introducing
> UnionCoder may yield encoding/decoding performance gains
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