ExecutableStage should be able to accept multiple input PCollection
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fn-execution
java
new feature
P3
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- Java
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Description
Current implementation of ExecutableStage only accepts one input PColletion: https://github.com/apache/beam/blob/5ee4cf4e4880782492ec26f2b454a6df9b25f1e2/model/pipeline/src/main/proto/beam_runner_api.proto#L1247. But it's possible that a ExecutableStage has multiple inputs.
Imported from Jira [BEAM-7626](https://issues.apache.org/jira/browse/BEAM-7626). Original Jira may contain additional context.
Reported by: boyuanz.
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