jedcunningham opened a new pull request #17452:
URL: https://github.com/apache/airflow/pull/17452


   snowflake-sqlalchemy 1.3 now depends on sqlalchemy 1.4+, so pin to a max of 
1.2.x.
   
   The webserver cannot start when we have sqlalchemy 1.4, throwing the 
following exceptions:
   
   ```airflow._vendor.connexion.exceptions.ResolverError: <ResolverError: 
columns>```
   
   and
   
   ```AttributeError: columns```
   
   A workaround for any users trying to install 
`apache-airflow-providers-snowflake`, simply also add 
`snowflake-sqlalchemy==1.2.5` (as of writing) to avoid pulling in the latest 
version of `snowflake-sqlalchemy`, and as a result, the latest `sqlalchemy`.


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