melin commented on issue #9687:
URL: https://github.com/apache/dubbo/issues/9687#issuecomment-1041050502


   3.15 之后是支持的
   
https://stackoverflow.com/questions/42622015/how-to-define-an-optional-field-in-protobuf-3/62566052#62566052
   [image: image.png]
   
   earthchen ***@***.***> 于2022年2月16日周三 10:23写道:
   
   > 标准的 proto3 似乎就是不支持 optional,在不填的时候就是会填充默认值
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