private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();

        defaultData = new ConcurrentHashMap<>(data.size());
        unrequestedParameters = Collections.newSetFromMap(new ConcurrentHashMap<>(data.size()));
    }
Merges two {@link ParameterTool}.

@param other Other {@link ParameterTool} object
@return The Merged {@link ParameterTool}
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/util/ParameterTool.java