Robert Burke created BEAM-6255:
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Summary: Support emit func output in the Go SDK's CombineFn
ExtractOutput
Key: BEAM-6255
URL: https://issues.apache.org/jira/browse/BEAM-6255
Project: Beam
Issue Type: New Feature
Components: sdk-go
Reporter: Robert Burke
Assignee: Robert Burke
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.
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