Vikas Kedigehalli created BEAM-1865:
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Summary: Input Coder of GroupByKey should be a KV Coder in the
Python SDK
Key: BEAM-1865
URL: https://issues.apache.org/jira/browse/BEAM-1865
Project: Beam
Issue Type: Bug
Components: sdk-py
Reporter: Vikas Kedigehalli
Assignee: Vikas Kedigehalli
`Any` type is consistent with `KV` in python. The coder for `Any` type is a
fallback coder or a `FastPrimitivesCoder`, but for a `GroupByKey` operation
this needs to be a `TupleCoder` to ensure that the generated pipeline
representation is runnable on a runner in a different language (in the Fn API
world)
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