code: protected function prepareCount()
      {
          if (is_null($this->idsCount)) {
              $options = array(
                  SelectorSourceInterface::RESULT => SelectorSourceInterface::RESULT_COUNT,
                  SelectorSourceInterface::GROUPBY => $this->groupBy,
              );
              $this->idsCount = $this->source->loadIds(
                  $this->criterias,
                  array_merge($this->options, $options)
              );
          }
  
          return $this;
      }
docs: prepare count : there the criterias are fetched
  @throws Exception\NoDataException
  @return \Yucca\Component\Selector\SelectorAbstract