damccorm commented on code in PR #35952:
URL: https://github.com/apache/beam/pull/35952#discussion_r2304978111


##########
sdks/python/apache_beam/yaml/json_utils.py:
##########
@@ -287,8 +287,9 @@ def row_to_json(beam_type: schema_pb2.FieldType) -> 
Callable[[Any], Any]:
         for field in beam_type.row_type.schema.fields
     }
     return lambda row: {
-        name: convert(getattr(row, name))
+        name: converted
         for (name, convert) in converters.items()
+        if (converted := convert(getattr(row, name, None))) is not None

Review Comment:
   Ok.  I think this is fine - arguably both should error, but I think making 
all fields nullable is ok.
   
   Eventually it might be good to add a `optional: False` field so that we can 
validate null fields as errors



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