@Override
  public int estimateSize() {
    return 8 + 80 + super.estimateSize() + 8 + (deviceInfo == null ? 0 : deviceInfo.estimateSize());
  }
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