[GitHub] [incubator-superset] vdovychenko opened a new issue #11185: Empty Line Chart when using "minute" time grain and Group by

[GitBox]

vdovychenko opened a new issue #11185:
URL: https://github.com/apache/incubator-superset/issues/11185


   ### Expected results
   
   Expect to see the graph on Line Chart.
   
   ### Actual results
   
   Superset doesn't show anything, but from screenshot you can see that data is 
there, as popup window shows numbers.
   
   #### Screenshots
   
   How it works with dimension of 1 value:
   <img width="1348" alt="Screenshot 2020-10-07 at 16 51 09" 
src="https://user-images.githubusercontent.com/4902849/95349378-4edfd600-08bf-11eb-81a5-3934b25a2d97.png";>
   
   This is error. How it works with dimension of 2 values:
   <img width="1338" alt="Screenshot 2020-10-07 at 16 53 38" 
src="https://user-images.githubusercontent.com/4902849/95349450-6323d300-08bf-11eb-9210-dfa5b6a8840a.png";>
   
   
   
   #### How to reproduce the bug
   
   Create Line Chart from source with around 5000 raw data.
   Set Time Grain to "minute"
   Set "Group by" to column with 2 values. In my case it's camera1 and camera2. 
(If number of dimension values = 2, everything works)
   
   ### Environment
   
   (please complete the following information):
   
   - superset version: 0.36 and above. Tried 0.36 and 0.37.2
   
   


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