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https://issues.apache.org/jira/browse/BEAM-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546508#comment-17546508
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Kenneth Knowles commented on BEAM-1982:
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This issue has been migrated to https://github.com/apache/beam/issues/18373
> Refactor PTransformOverrideFactories to remove code duplication
> ---------------------------------------------------------------
>
> Key: BEAM-1982
> URL: https://issues.apache.org/jira/browse/BEAM-1982
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Thomas Groh
> Priority: P3
> Labels: newbie, starter
>
> The majority of the factories take in a single PCollection as input and
> produce a single PCollection as output; the code to extract the single input
> can be invisible as part of the class hierarchy, rather than explicitly
> called in every override.
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