@Override
    public int compareTo(CleanupTask that) {
      return Long.compare(this.scheduledTime, that.scheduledTime);
    }
It should be noted that all AlignedChunkData of the same partition split from a source file
should be guaranteed to be written to the same new file. Otherwise, for detached
BatchedAlignedChunkData, it may result in no data for the time column in the new file.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/load/LoadTsFileManager.java