public DataRegion getDataRegion() {
      return dataRegion;
    }
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