@Override
    public Object parse(SourceData sourceData, int rowIndex, Context context) {
        Object stringObj = stringParser.parse(sourceData, rowIndex, context);
        if (stringObj == null) {
            return null;
        }
        String str = OperatorTools.parseString(stringObj);
        return new StringBuilder(str).reverse().toString();
    }
ReverseFunction  ->  reverse(str)
description:
- Return NULL if 'str' is a empty string or NULL
- Return the 'str' with the order of the characters reversed
inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/string/ReverseFunction.java