@Override
  public IInternalMNode<IMemMNode> getAsInternalMNode() {
    return this;
  }
MNodeContainer reference and basic occupation, 8 + 80B. DeviceInfo reference and size.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/mem/mnode/impl/BasicInternalMNode.java