ENGCOM-4302: Backward compatibility fix.

Author: p-bystritsky

app/code/Magento/Reports/Model/ResourceModel/Order/Collection.php

@@ -769,7 +769,7 @@ public function addOrdersCount()
      */
     public function addRevenueToSelect($convertCurrency = false)
     {
-        $expr = $this->getTotalsExpression(
+        $expr = $this->getTotalsExpressionWithDiscountRefunded(
             !$convertCurrency,
             $this->getConnection()->getIfNullSql('main_table.base_subtotal_refunded', 0),
             $this->getConnection()->getIfNullSql('main_table.base_subtotal_canceled', 0),
@@ -792,7 +792,7 @@ public function addSumAvgTotals($storeId = 0)
         /**
          * calculate average and total amount
          */
-        $expr = $this->getTotalsExpression(
+        $expr = $this->getTotalsExpressionWithDiscountRefunded(
             $storeId,
             $this->getConnection()->getIfNullSql('main_table.base_subtotal_refunded', 0),
             $this->getConnection()->getIfNullSql('main_table.base_subtotal_canceled', 0),
@@ -810,16 +810,40 @@ public function addSumAvgTotals($storeId = 0)
     }
 
     /**
-     * Get SQL expression for totals
+     * Get SQL expression for totals.
      *
      * @param int $storeId
      * @param string $baseSubtotalRefunded
      * @param string $baseSubtotalCanceled
-     * @param string $baseDiscountRefunded
      * @param string $baseDiscountCanceled
      * @return string
+     * @deprecated
+     * @see getTotalsExpressionWithDiscountRefunded
      */
     protected function getTotalsExpression(
+        $storeId,
+        $baseSubtotalRefunded,
+        $baseSubtotalCanceled,
+        $baseDiscountCanceled
+    ) {
+        $template = ($storeId != 0)
+            ? '(main_table.base_subtotal - %2$s - %1$s - ABS(main_table.base_discount_amount) - %3$s)'
+            : '((main_table.base_subtotal - %1$s - %2$s - ABS(main_table.base_discount_amount) + %3$s) '
+            . ' * main_table.base_to_global_rate)';
+        return sprintf($template, $baseSubtotalRefunded, $baseSubtotalCanceled, $baseDiscountCanceled);
+    }
+
+    /**
+     * Get SQL expression for totals with discount refunded.
+     *
+     * @param int $storeId
+     * @param string $baseSubtotalRefunded
+     * @param string $baseSubtotalCanceled
+     * @param string $baseDiscountRefunded
+     * @param string $baseDiscountCanceled
+     * @return string
+     */
+    private function getTotalsExpressionWithDiscountRefunded(
         $storeId,
         $baseSubtotalRefunded,
         $baseSubtotalCanceled,