[Bug]: Portable translation or SDK harness appears to have a bug in GBK coders

[kennknowles]

What happened?

In the implementation of Redistribute as a simple composite with no special handling, the portable Java-based runners as well as the ULR have a common failure:

Error received from SDK harness for instruction 3: org.apache.beam.sdk.util.UserCodeException: java.lang.ClassCastException: org.apache.beam.sdk.util.WindowedValue$ValueInGlobalWindow cannot be cast to java.lang.String

See e.g.

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

Issue Components

• [X] Component: Python SDK
• [ ] Component: Java SDK
• [ ] Component: Go SDK
• [ ] Component: Typescript SDK
• [ ] Component: IO connector
• [ ] Component: Beam YAML
• [ ] Component: Beam examples
• [ ] Component: Beam playground
• [ ] Component: Beam katas
• [ ] Component: Website
• [X] Component: Spark Runner
• [X] Component: Flink Runner
• [X] Component: Samza Runner
• [ ] Component: Twister2 Runner
• [ ] Component: Hazelcast Jet Runner
• [ ] Component: Google Cloud Dataflow Runner

[github-actions[bot]]

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