Josh Wills created CRUNCH-328:
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             Summary: Add support for ExtensionRegistry with PTypes.protos
                 Key: CRUNCH-328
                 URL: https://issues.apache.org/jira/browse/CRUNCH-328
             Project: Crunch
          Issue Type: Bug
          Components: Core
            Reporter: Josh Wills
            Assignee: Josh Wills


Came across a use case where it would be great to be able to have support for 
deserializing protobufs using an ExtensionRegistry for some custom message 
extensions. ExtensionRegistry isn't serializable and there isn't a good way to 
serialize it using the current protobuf libraries, so I also created a 
Serializable extension of Guava's Supplier interface to handle cases where we 
need to specify how to construct an object for use in a DoFn as an external 
argument, which seemed fairly useful.



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