Support emit func output in the Go SDK's CombineFn ExtractOutput
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go
new feature
P3
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- Java
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Description
When taking a sample or other filter, it consider supporting emitting values with an emit func from the accumulator rather than extract a single value. Otherwise general accumulators tend to go through awkward reflective code to construct the slice.
Either the single value return or an emitted return should be supported.
Imported from Jira [BEAM-6255](https://issues.apache.org/jira/browse/BEAM-6255). Original Jira may contain additional context.
Reported by: lostluck.
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