/**
  * Get report for some interval
  *
  * @param int $fromDate
  * @param int $toDate
  * @return \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
  */
 protected function _getReport($fromDate, $toDate)
 {
     if ($this->_reportCollection === null) {
         return [];
     }
     $reportResource = $this->_collectionFactory->create($this->_reportCollection);
     $reportResource->setDateRange($fromDate, $toDate)->setStoreIds($this->getStoreIds());
     return $reportResource;
 }
 /**
  * @return array
  */
 public function getSubTotals()
 {
     $filterData = $this->getFilterData();
     $subTotalsCollection = $this->_resourceFactory->create($this->getResourceCollectionName())->setPeriod($filterData->getData('period_type'))->setDateRange($filterData->getData('from', null), $filterData->getData('to', null))->addStoreFilter($this->_getStoreIds())->setAggregatedColumns($this->_getAggregatedColumns())->setIsSubTotals(true);
     $this->_addOrderStatusFilter($subTotalsCollection, $filterData);
     $this->_addCustomFilter($subTotalsCollection, $filterData);
     $this->setSubTotals($subTotalsCollection->getItems());
     return parent::getSubTotals();
 }