Protobuf supports recursive schemes - but note that each object is separate (it
is a tree, not a graph). For example, descriptor.proto includes the
self-referential "DescriptorProto" (which is a "message" in language terms)
// Describes a message type.
message DescriptorProto {
optional string name = 1;
repeated FieldDescriptorProto field = 2;
repeated FieldDescriptorProto extension = 6;
repeated DescriptorProto nested_type = 3;
repeated EnumDescriptorProto enum_type = 4;
message ExtensionRange {
optional int32 start = 1;
optional int32 end = 2;
}
repeated ExtensionRange extension_range = 5;
optional MessageOptions options = 7;
}
Marc
On 20 Jul 2013, at 00:41, pbjson <[email protected]> wrote:
>
> Hello,
>
> 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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