@Override
  public PlanNode clone() {
    throw new NotImplementedException("clone of load single TsFile is not implemented");
  }
only used for load locally.

@return local TRegionReplicaSet
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/load/LoadSingleTsFileNode.java