@Override
  public Chunk loadChunk(ChunkMetadata chunkMetaData) {
    throw new UnsupportedOperationException();
  }
To read one aligned chunk from memory, and only used in iotdb server module.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/read/reader/chunk/MemAlignedChunkLoader.java