@Override
  protected void serializeAttributes(DataOutputStream stream) throws IOException {
    PlanNodeType.INSERT_MULTI_TABLET.serialize(stream);

    ReadWriteIOUtils.write(insertTabletNodeList.size(), stream);

    for (InsertTabletNode node : insertTabletNodeList) {
      node.subSerialize(stream);
    }
    for (Integer index : parentInsertTabletNodeIndexList) {
      ReadWriteIOUtils.write(index, stream);
    }
  }
record the result of insert tablets
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/write/InsertMultiTabletsNode.java