Robert Burke created BEAM-6738:
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             Summary: Reduce Combine overhead
                 Key: BEAM-6738
                 URL: https://issues.apache.org/jira/browse/BEAM-6738
             Project: Beam
          Issue Type: Sub-task
          Components: sdk-go
            Reporter: Robert Burke
            Assignee: Robert Burke


Sibling to BEAM-4726 for ParDos, this should be to add the invoker caching to 
the exec/combine.go units, since for example AddInput would be done for every 
single element, and for large key spaces, the same applies for the other 
CombineFn components.



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