EBoisseauSierra opened a new pull request #13852:
URL: https://github.com/apache/superset/pull/13852


   ### SUMMARY
   Prophet is heavily dependent on Pystan: 
https://facebook.github.io/prophet/docs/installation.html
   
   Pystan has recently (2021-03-25) release its v3.0.0.
   
   This release is not backward compatible and breaks fbprophet: 
https://github.com/facebook/prophet/issues/1856
   
   (Indeed, fbprophet 0.6 specifies `pystan>=2.14` — but doesn't restrict 
upgrading to next major release: 
https://github.com/facebook/prophet/blob/0.6/python/requirements.txt#L3)
   
   So we need to pin pystan to the lastest non 3.x release, while fbprophet 
fixes the dependency on their side.
   
   ### TEST PLAN
   `pip install '.[prophet]'`?
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [x] Has associated issue: Fixes #13851
   - [ ] Changes UI
   - [ ] Requires DB Migration.
   - [ ] Confirm DB Migration upgrade and downgrade tested.
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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