micsbot opened a new pull request, #21417:
URL: https://github.com/apache/superset/pull/21417

   Previous code is not working. It is showing an error because the subquery is 
making a reference to the same table sl_columns. This code makes explicit the 
alias and join the tables NewColumn with the subquery. 
https://github.com/apache/superset/issues/20790 
   
   fix(superset db upgrade)
   ### SUMMARY
   Previous code is not working. It is showing an error because the subquery is 
making a reference to the same table sl_columns. This code makes explicit the 
alias and join the tables NewColumn with the subquery.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   ### TESTING INSTRUCTIONS
   run docker, and exec superset update db using a database with data from 
superset 1.x.x
   ### ADDITIONAL INFORMATION
   - [ X] Has associated issue: https://github.com/apache/superset/issues/20790
   


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