johnjcasey commented on a change in pull request #16923:
URL: https://github.com/apache/beam/pull/16923#discussion_r836745064



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File path: sdks/python/apache_beam/coders/coders.py
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@@ -584,6 +594,9 @@ def __hash__(self):
     return hash(type(self)) + hash(self._value_coder)
 
 
+Coder.register_structured_urn(common_urns.coders.NULLABLE.urn, NullableCoder)

Review comment:
       Yes. We have a yaml file that contains test cases that all three sdks 
read and validate. org/apache/beam/model/fnexecution/v1/standard_coders.yaml




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