pitrou commented on issue #39094:
URL: https://github.com/apache/arrow/issues/39094#issuecomment-1845619410

   The way we would do it is like in IPC: serialize the extension name and the 
extension serialized form.
   Then on deserialization (in C++):
   1. first get the extension type from its name using `GetExtensionType`
   2. then deserialize the actual instance using `ExtensionType::Deserialize`
   


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