@Override
    public String format() {
        String targetStr = StringUtils
                .join(targets.stream().map(FunctionParam::format).collect(Collectors.toList()), ",");
        return String.format("%s %s %s (%s)", logicOperator.format(),
                source.format(), compareOperator.format(), targetStr);
    }
filter for filtering out data with multi-values
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/protocol/transformation/function/MultiValueFilterFunction.java