[GitHub] [iotdb] qiaojialin opened a new issue #2243: Do not return null in group by time query

[GitBox]

qiaojialin opened a new issue #2243:
URL: https://github.com/apache/iotdb/issues/2243


   If all points in one row are null, we'd better give users the choice not to 
return this row.
   
   在 group by time 查询中，让用户可选择，不返回空的行
   
   
![image](https://user-images.githubusercontent.com/7240743/101747809-b6f0a980-3b06-11eb-8b9a-34ec4c5f539f.png)
   


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