Chamikara Madhusanka Jayalath created BEAM-11715:
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             Summary: Combiner packing creates an incorrect proto
                 Key: BEAM-11715
                 URL: https://issues.apache.org/jira/browse/BEAM-11715
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Chamikara Madhusanka Jayalath
            Assignee: Yifan Mai
             Fix For: 2.28.0


Seems like optimization creates a CombinePerKey transform that does not have 
any sub-transforms. We should fix this by preserving the old structure for 
CombinePerKey (GBK+CombineValues composite).



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