public SimpleExpression<A> as(String alias) {
        return Expressions.operation(getType(), Ops.ALIAS, this, ExpressionUtils.path(getType(), alias));
    }
{@code WindowFunction} is a builder for window function expressions

@param <A> expression type

@author tiwe
querydsl-sql/src/main/java/com/querydsl/sql/WindowFunction.java