public AccessStrategy getAccessStrategy() {
    return accessStrategy;
  }
Used to specify the output data type of the UDTF. In other words, the data type you set here
determines the type of data that the PointCollector in {@link UDTF#transform(Row,
PointCollector)}, {@link UDTF#transform(RowWindow, PointCollector)} or {@link
UDTF#terminate(PointCollector)} can receive.

@param outputDataType the output data type of the UDTF
@return this
@see PointCollector
iotdb-api/udf-api/src/main/java/org/apache/iotdb/udf/api/customizer/config/UDTFConfigurations.java