etr2460 opened a new pull request #13802:
URL: https://github.com/apache/superset/pull/13802


   ### SUMMARY
   When debugging a performance issue today, I ran into a situation where a 
stacked bar chart had about 20k series, but all of them except 1 were filled 
with 0s and Nones. This took ~1 minute to render in a dashboard and froze 
chrome.
   
   This PR removes empty time series from time series visualizations. I'm not 
sure what the consequences of this might be, so would appreciate feedback from 
folks. If this seems reasonable, then I'll follow up by adding some tests.
   
   ### TEST PLAN
   CI
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Changes UI
   - [ ] Requires DB Migration.
   - [ ] Confirm DB Migration upgrade and downgrade tested.
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   
   
   to: @graceguo-supercat @ktmud @villebro @mistercrunch 


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