message: fix: the calculated columns explicit type convert into date
diff: @@ -309,7 +309,8 @@ class TableColumn(Model, BaseColumn):
  ],
  ) -> str:
  """Convert datetime object to a SQL expression string"""
  - sql = self.db_engine_spec.convert_dttm(self.type, dttm) if self.type else None
  + 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
  if sql:
  return sql
  