public MultiTsFileNonAlignedMeasurementMetadataListIterator
      iterateNotAlignedSeriesAndChunkMetadataListOfCurrentDevice() throws IOException {
    return new MultiTsFileNonAlignedMeasurementMetadataListIterator();
  }
return MultiTsFileNonAlignedMeasurementMetadataListIterator, who iterates the measurements of
not aligned device

@return measurement iterator of not aligned device
@throws IOException if io errors occurred
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/compaction/execute/utils/MultiTsFileDeviceIterator.java