Method UnregisterType

cpp/src/arrow/extension_type.cc:118–126

  }

  Status UnregisterType(const std::string& type_name) override {
    std::lock_guard<std::mutex> lock(lock_);
    auto it = name_to_type_.find(type_name);
    if (it == name_to_type_.end()) {
      return Status::KeyError("No type extension with name ", type_name, " found");
    }
    name_to_type_.erase(it);
    return Status::OK();
  }

  std::shared_ptr<ExtensionType> GetType(const std::string& type_name) override {
    std::lock_guard<std::mutex> lock(lock_);