Tianyang Hu created BEAM-7665:
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Summary: Support TypeDefinition options in beam.Combine()
Key: BEAM-7665
URL: https://issues.apache.org/jira/browse/BEAM-7665
Project: Beam
Issue Type: Improvement
Components: sdk-go
Reporter: Tianyang Hu
Assignee: Tianyang Hu
Today, CombineFn's output type must be either concrete or a generic type that
can be inferred from the input type. This doesn't work if the input type is
struct{U, V} while the output type is V (where U and V are generic types).
Similar to ParDo, we could add TypeDefinition options support to Combine. This
will bind generic types in the CombineFn to the specified concrete types at
pipeline construction time.
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