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kotlinlang

I think it's not possible at the moment, but you can use something like that:
```fun &lt;T:Any&gt; wrapAsExpression(query: Query) = object : Expression&lt;T&gt;() {
    override fun toSQL(queryBuilder: QueryBuilder): String = "(" + query.prepareSQL(queryBuilder) + ")"
}```
You have to write for your query:
``` val rating = wrapWithExpression(RaitingsTable.slice(listOf(RatingsTable.rating.max())).select { RatingsTable.id eq ItemsTable.id }).alias("rating)
ItemsTable.slice(ItemsTable.col1, rating).selectAll().orderBy(rating)
```