junlincc opened a new issue #11908:
URL: https://github.com/apache/incubator-superset/issues/11908


   
![ezgif-2-6a3b3f1f0f71](https://user-images.githubusercontent.com/67837651/100953278-1a575780-34c7-11eb-906f-310b50c0b320.gif)
   
   sample datasource `wb_health_population` has over 300 columns, when user 
click `View samples` from Explore, page crashes 
   
   to reproduce:
   - selecte `wb_health_population` as datasource
   - make any chart
   - go to top right hamburger button and click View samples
   - blank page


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