Yifan Mai created BEAM-10779:
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Summary: 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
Assignee: Yifan Mai
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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