[GitHub] [beam] lostluck opened a new issue, #22211: [Feature Request][Go SDK] Support Key Aware CombineFns

[GitBox <gi...@apache.org>]

lostluck opened a new issue, #22211:
URL: https://github.com/apache/beam/issues/22211

   ### What would you like to happen?
   
   It looks like that the CombineFns [documentation indicates that they should support being key aware.](https://pkg.go.dev/github.com/apache/beam/sdks/v2/go/pkg/beam#CombinePerKey)
   
   However, validation doesn't support this style of CombineFn despite the execution code being present to handle it.
   
   https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/exec/combine.go#L39
   
   That it broke and there are no examples or tests, means it's never truly been supported, so this should be treated as a new feature.
   
   Either the documentation and associated code should be cleared up to avoid future misunderstandings, or the feature should be properly implemented and integration tested.
   
   
   
   ### Issue Priority
   
   Priority: 2
   
   ### Issue Component
   
   Component: sdk-go


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