villebro opened a new pull request #14095:
URL: https://github.com/apache/superset/pull/14095


   ### SUMMARY
   The recent PR #13739 caused a regression causing mutated column aliases to 
be returned from the SQLAlchemy model in the resulting `DataFrame`. By setting 
the `key` parameter to the expected column name 
(https://docs.sqlalchemy.org/en/13/core/metadata.html#sqlalchemy.schema.Column.params.key),
 and later referencing that when renaming columns in the `DataFrame`, we can 
ensure that column names are mutated back prior to returning.
   
   ### BEFORE
   Currently column names containing restricted characters are returned. See 
the failed query and the column `COUNT_DISTINCT(str)` called 
`COUNT_DISTINCT__93439` in the Results tab):
   
![image](https://user-images.githubusercontent.com/33317356/114532901-f9152d80-9c55-11eb-9062-7cd0e8525627.png)
   
   ### AFTER
   After the change, the chart renders and the column names in the Results tab 
show the expected labels:
   
![image](https://user-images.githubusercontent.com/33317356/114532989-1813bf80-9c56-11eb-8138-845cb2e46055.png)
   
   ### TEST PLAN
   CI + new test
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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