@Override
  public long getCurrentEndTime(long time1, long time2) {
    return Math.max(time1, time2);
  }
return if order by time desc, return true if time >= endTime, otherwise false.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/process/join/merge/DescTimeComparator.java