xchwan commented on PR #55500:
URL: https://github.com/apache/airflow/pull/55500#issuecomment-3283332081

   > would be great if we could add some description :) also would love to know 
why are we removing them
   
   Most people is ok because they use mysqlclient as driver following official 
doc. But, some people use PyMySQL to be a mysql driver. In this migration file, 
both will go to ```conn.dialect.name == "mysql"```. When use PyMySQL, it will 
fail due to prepare statement which the original sql contains. PyMySQL is not 
support prepare statement and currently still open issue. So I rewrite the sql 
remove prepare statement. To help PyMySQL user can also accept the sql 
statement.


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