Kenneth Knowles created BEAM-1198:
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Summary: ViewFn: explicitly decouple runner materialization of
side inputs from SDK-specific mapping
Key: BEAM-1198
URL: https://issues.apache.org/jira/browse/BEAM-1198
Project: Beam
Issue Type: New Feature
Components: beam-model-fn-api, beam-model-runner-api
Reporter: Kenneth Knowles
For side inputs, the field {{PCollectionView.fromIterableInternal}} implies an
"iterable" materialization of the contents of a PCollection, which is adapted
to the desired user-facing type within a UDF (today the PCollectionView "is"
the UDF)
In practice, runners get adequate performance by special casing just a couple
of types of PCollectionView in a rather cumbersome manner.
The design to improve this is https://s.apache.org/beam-side-inputs-1-pager and
this makes the de facto standard approach the actual model.
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