code: public com.google.privacy.dlp.v2.BigQueryKey getBigQueryKey() {
      if (typeCase_ == 3) {
        return (com.google.privacy.dlp.v2.BigQueryKey) type_;
      }
      return com.google.privacy.dlp.v2.BigQueryKey.getDefaultInstance();
    }
docs: <code>.google.privacy.dlp.v2.BigQueryKey big_query_key = 3;</code>