Brian Hulette created BEAM-9477:
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             Summary: RowCoder should be hashable and picklable
                 Key: BEAM-9477
                 URL: https://issues.apache.org/jira/browse/BEAM-9477
             Project: Beam
          Issue Type: Improvement
          Components: sdk-py-core
            Reporter: Brian Hulette
            Assignee: Brian Hulette
             Fix For: 2.21.0


hashable - because it needs to be placed in PipelineContexts' obj_to_id map

picklable - sometimes coders get pickled (e.g. when the type they encode is 
used in beam.Create)



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