public Integer getSystemInt(String key) {
    String value = systemAttributes.get(key);
    return value == null ? null : Integer.parseInt(value);
  }
Used in {@link UDTF#beforeStart(UDFParameters, UDTFConfigurations)}.

<p>This class is used to parse the parameters in the UDF entered by the user.

<p>The input parameters of UDF have two parts. The first part is the paths (measurements) of the
time series that the UDF needs to process, and the second part is the key-value pair attributes
for customization. Only the second part can be empty.

<p>Note that the user must enter the paths (measurements) part before entering the attributes
part.
iotdb-api/udf-api/src/main/java/org/apache/iotdb/udf/api/customizer/parameter/UDFParameters.java