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https://issues.apache.org/jira/browse/BEAM-4782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861610#comment-16861610
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Udi Meiri commented on BEAM-4782:
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Could https://github.com/apache/beam/pull/8654 be a solution to this?
> Enforce KV coders for MultiMap side inputs
> ------------------------------------------
>
> Key: BEAM-4782
> URL: https://issues.apache.org/jira/browse/BEAM-4782
> Project: Beam
> Issue Type: Task
> Components: sdk-py-harness
> Reporter: Robert Bradshaw
> Assignee: Robert Bradshaw
> Priority: Major
>
> Non-Python runners don't understand that the (default) FastPrimitivesCoder
> may be a KV coder.
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