@Override
    public Object parse(SourceData sourceData, int rowIndex, Context context) {
        StringBuilder builder = new StringBuilder();
        for (ValueParser node : nodeList) {
            builder.append(node.parse(sourceData, rowIndex, context));
        }
        return builder.toString();
    }
ConcatFunction  ->  concat(string1, string2, ...)
description:
- Return NULL If any parameter is NULL
- Return the string of the connection (string1, string2,...)
inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/string/ConcatFunction.java