john-bodley commented on a change in pull request #16950:
URL: https://github.com/apache/superset/pull/16950#discussion_r732263165



##########
File path: superset/connectors/sqla/models.py
##########
@@ -334,8 +334,7 @@ def dttm_sql_literal(
         ],
     ) -> str:
         """Convert datetime object to a SQL expression string"""
-        dttm_type = self.type or ("DATETIME" if self.is_dttm else None)
-        sql = self.db_engine_spec.convert_dttm(dttm_type, dttm) if dttm_type 
else None
+        sql = self.db_engine_spec.convert_dttm(self.type, dttm) if self.type 
else None

Review comment:
       @villebro the issue is any column which is flagged as being `is_dttm` 
without  a type is treated as a `DATETIME` type which could result in the wrong 
conversion.
   
   Again it seems like the fix was unnecessary as the actual solution/paved 
path workflow is merely to define the type of the calculated column. We likely 
should make this a required field and perform form validation.




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