betodealmeida opened a new pull request #17275:
URL: https://github.com/apache/superset/pull/17275


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   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   
   The migration in https://github.com/apache/superset/pull/16756 is failing in 
MySQL 8. Renaming the column `dbs.allow_csv_upload` fails because there's a 
check constraint on it.
   
   This seems to be a known bug 
(https://github.com/sqlalchemy/alembic/issues/699), and from that thread 
dropping the constraint seems safe. The problem is that existing installations 
already have the constraint, so we can't add `create_constraint=False` to 
boolean columns in the model.
   
   This PR fixes the migration by explicitly dropping the check constraint if 
it exists, and renaming the column after.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   
   ### TESTING INSTRUCTIONS
   <!--- Required! What steps can be taken to manually verify the changes? -->
   
   Install Superset using a MySQL 8 database. The `superset db upgrade` step 
will fail on the migration `b92d69a6643c_rename_csv_to_file.py`.
   
   With this PR, the check constraint is dropped and the migration succeeds.
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Required feature flags:
   - [ ] 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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