@Override
public T runAggregateFunction(T value1, T value2) {
ValueExpression<T> ve1 = new ValueSpecification<T>(_wrapper, value1);
ValueExpression<T> ve2 = new ValueSpecification<T>(_wrapper, value2);
Addition<T> result = new Addition<T>(ve1, ve2);
return result.eval(null);
}
// actual operator implementation
@Override
public T runAggregateFunction(T value, List<String> tuple) {
ValueExpression<T> base = new ValueSpecification<T>(_wrapper, value);
Addition<T> result = new Addition<T>(base, _ve);
return result.eval(tuple);
}