public OrderSpecifier<T> asc() {
        if (asc == null) {
            asc = new OrderSpecifier<T>(Order.ASC, mixin);
        }
        return asc;
    }
Create an OrderSpecifier for ascending order of this expression

@return ascending order by this
querydsl-core/src/main/java/com/querydsl/core/types/dsl/ComparableExpressionBase.java