@Override
    public Object parse(SourceData sourceData, int rowIndex, Context context) {
        Object stringObject = stringParser.parse(sourceData, rowIndex, context);
        if (stringObject == null) {
            return null;
        }
        String str = OperatorTools.parseString(stringObject);
        return str.length();
    }
CharLengthFunction  ->  char_length(string)
Description:
- Return NULL if the string is NULL
- Return the character length of the string
inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/string/CharLengthFunction.java