private static int getStreamingFetchSize(SQLMetadataConnector connector) {
    if (connector instanceof MySQLConnector) {
      return Integer.MIN_VALUE;
    }
    return DEFAULT_STREAMING_RESULT_SIZE;
  }
@param connector SQL DBI connector.
@return streaming fetch size.
druid-handler/src/java/org/apache/hadoop/hive/druid/DruidStorageHandlerUtils.java