if stmt.Schema != nil {
			if field := stmt.Schema.LookUpField(field); field != nil {
				fileType := m.FullDataTypeOf(field)
				return m.DB.Exec(
					"ALTER TABLE ? ALTER COLUMN ? TYPE ?",
					m.CurrentTable(stmt), clause.Column{Name: field.DBName}, fileType,
				).Error

			}
		}
		return fmt.Errorf("failed to look up field with name: %s", field)
	})
}