Add support for side inputs in Spark portable streaming
Open
improvement
P3
portability
runners
spark
- Dominant language
- Java
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Description
The Spark portable runner for streaming jobs currently does not support side inputs to the executable stage, which limits the types of pipelines that can be run.
Imported from Jira [BEAM-10712](https://issues.apache.org/jira/browse/BEAM-10712). Original Jira may contain additional context.
Reported by: annaqin.
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