public boolean hasSystemAttribute(String attributeKey) {
    return systemAttributes.containsKey(attributeKey);
  }
Check if the system attribute exists.

@param attributeKey the key of the system attribute
@return true if the system attribute exists, false otherwise
iotdb-api/udf-api/src/main/java/org/apache/iotdb/udf/api/customizer/parameter/FunctionArguments.java