private List<T> convert(Number... numbers) {
        List<T> list = new ArrayList<T>(numbers.length);
        for (Number number : numbers) {
            list.add(MathUtils.cast(number, getType()));
        }
        return list;
    }
Create a {@code sum(this)} expression

<p>Get the sum of this expression (aggregation)</p>

@return sum(this)
querydsl-core/src/main/java/com/querydsl/core/types/dsl/NumberExpression.java