Has anyone seen the following structure in protobuffer?

message KeyValue{

 required string key=1;
 optional string  value=2;
 optional KeyValue key_value=10;


this is a circular reference and how would you resolve this if you have 
convert this to a flat structure of primitives for eg: to be converted to a 
hive schema.

eg: keyvalue<key:string,value string, key_value:string>

Has anyone come across such a situation and any better way to do this?

Thanks in advance.

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