default void beforeStart(FunctionArguments arguments) throws UDFException {
    // do nothing
  }
This method is called after the ScalarFunction is instantiated and before the beginning of the
transformation process. This method is mainly used to initialize the resources used in
ScalarFunction.

@param arguments used to parse the input arguments entered by the user
@throws UDFException the user can throw errors if necessary
iotdb-api/udf-api/src/main/java/org/apache/iotdb/udf/api/relational/ScalarFunction.java