Heejong Lee created BEAM-9048:
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             Summary: Matching compile-time and run-time type information in 
Java external transforms
                 Key: BEAM-9048
                 URL: https://issues.apache.org/jira/browse/BEAM-9048
             Project: Beam
          Issue Type: Improvement
          Components: java-fn-execution
            Reporter: Heejong Lee


Output type annotation by Java external transform API only checks compile-time 
type correctness. Expansion service is solely responsible for run-time type 
correctness. It would be great if we match both information at pipeline 
construction time so that preventing pipeline failing in runners after 10 hours.



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