DInamic Cursor filter don't calculate the right minumum and maximun values

-- HikaShop version -- : 3.0.0
-- Joomla version -- : 3.6.5
-- PHP version -- : 7.0
-- Browser(s) name and version -- : firefox

I'have created some dinamyc cursor filter (ex Price, lenght, height) etc

I Use Joomlavi flatize template.

In the firs time i removed the comment in this line

$datas=$this->filterClass->getProductList($this, $filters);
As written in this topic: www.hikashop.com/forum/filters-search/88...existing-values.html

In this way the dinamic filter start to work, but calculate the extreme value only for main product, without consider the variants.

For example in a category i have variant from 430 to 2200 Euro, but the filter show me as extreme value 430 and 1800 Euro (and not 2200 tha is the real maximun value: 1800 is the maximum value for the main product, but variant has bigger price)!!!

Is it possible to filter the price, lenght, height considering even variant value?

Ok
But showing highest price in an ecommerce, is not the best choice!

I try to create a checkbox custom field so i can assign different lenght to my main product.

Now i try to filter using a checkbox or a single choiche, and this work good, but if i try to use cursor, it doesn't work. The number of query should be the same.. or not?