zhugw opened a new issue, #21120:
URL: https://github.com/apache/superset/issues/21120

   
   
   Upload csv, default is text type, and if text type and 
`mysql+mysqlconnector://`, in chart 2020-04 ==> b'2020-04' 
   So I have to modify table 
   ```
   alter table t modify column  `dt` varchar(20) ;
   ```
   but if user upload csv again, and select `Replace (drop and recreate 
table)`, I have to execute modify sql again.


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