@Override
    public Object parse(SourceData sourceData, int rowIndex, Context context) {
        Object stringObj = stringParser.parse(sourceData, rowIndex, context);
        if (stringObj == null) {
            return null;
        }
        return OperatorTools.parseString(stringObj).trim();
    }
TrimFunction  ->  trim(str) or btrim(string)
description:
- Return NULL if 'str' is NULL;
- Return the result of deleting spaces before and after the 'str'.
inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/string/TrimFunction.java