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https://issues.apache.org/jira/browse/BEAM-10779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17215961#comment-17215961
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Beam JIRA Bot commented on BEAM-10779:
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> Support multiple main inputs and side inputs for PTransformOverride
> -------------------------------------------------------------------
>
> Key: BEAM-10779
> URL: https://issues.apache.org/jira/browse/BEAM-10779
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Yifan Mai
> Priority: P2
> Time Spent: 8.5h
> Remaining Estimate: 0h
>
> Currently, {{PTransformOverride}} only supports overriding {{PTransform}} s
> that have a [single
> input|https://github.com/apache/beam/blob/cfa448d121297398312d09c531258a72b413488b/sdks/python/apache_beam/pipeline.py#L311-L317].
> It would be useful to support multiple main inputs and side inputs as well.
> Proposal:
> * Introduce a new method {{PTransformOverride.get_replacement_inputs(self,
> applied_ptransform)}} that can be overridden by end users. This method will
> be called to get the inputs for the replacement PTransform.
> * The default implementation will return a tuple of all the main inputs in
> order, concatenated with the all the side inputs {{PValue}} s in order.
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