How does OrderBySqlFormula support prepared statement?

I find [`OrderBySqlFormula`](https://github.com/kaleidos/grails-postgresql-extensions/blob/master/src/main/groovy/net/kaleidos/hibernate/order/OrderBySqlFormula.groovy) class support `ORDER BY` native sql, but how to use prepared statement? I think it's useful.

E.g:

```groovy
criteria {
    order(OrderBySqlFormula.sqlFormula('? + ?', [args.one, args.two]))
}
```