I've submitted a PR for issue IOTDB-1473 [https://github.com/apache/iotdb/pull/3755]

[程建云]

Hi, there


I've submitted a PR for issue IOTDB-1473 
[https://github.com/apache/iotdb/pull/3755]. Please help review and any 
comments is welcomed!


Thanks
Jianyun Cheng