@Override
    public void write(String s, DataOutputStream stream) throws IOException {
      ReadWriteIOUtils.write(s, stream);
    }
This PatternTreeMap is used to manage Modification. The append will merge of Modification that
intersect.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/datastructure/PatternTreeMapFactory.java