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https://issues.apache.org/jira/browse/BEAM-7236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547777#comment-17547777
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Kenneth Knowles commented on BEAM-7236:
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This issue has been migrated to https://github.com/apache/beam/issues/19504
> Support transcoding for Flatten in Spark Runner
> -----------------------------------------------
>
> Key: BEAM-7236
> URL: https://issues.apache.org/jira/browse/BEAM-7236
> Project: Beam
> Issue Type: New Feature
> Components: runner-spark
> Reporter: Kyle Weaver
> Priority: P3
>
> The Beam documentation mentions that Flatten does not require coders of all
> inputs to be of the same type, as long as the result type is the same.
> However, the current implementation in the Spark Runner requires all coders
> to match.
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