Fix wrong data of Import status with Add/Update method in Advanced Prices in CSV #21192

Author: DenisSaltanahmedov

app/code/Magento/AdvancedPricingImportExport/Model/Import/AdvancedPricing.php

@@ -408,6 +408,7 @@ protected function saveAndReplaceAdvancedPrices()
             } elseif (\Magento\ImportExport\Model\Import::BEHAVIOR_APPEND == $behavior) {
                 $this->processCountExistingPrices($tierPrices, self::TABLE_TIER_PRICE)
                     ->processCountNewPrices($tierPrices);
+
                 $this->saveProductPrices($tierPrices, self::TABLE_TIER_PRICE);
                 if ($listSku) {
                     $this->setUpdatedAt($listSku);
@@ -562,11 +563,14 @@ protected function processCountExistingPrices($prices, $table)
 
         $tableName = $this->_resourceFactory->create()->getTable($table);
         $productEntityLinkField = $this->getProductEntityLinkField();
-        $existingPrices = $this->_connection->fetchAssoc(
+        $existingPrices = $this->_connection->fetchAll(
             $this->_connection->select()->from(
                 $tableName,
-                ['value_id', $productEntityLinkField, 'all_groups', 'customer_group_id']
-            )->where($productEntityLinkField . ' IN (?)', $existProductIds)
+                [$productEntityLinkField, 'all_groups', 'customer_group_id', 'qty']
+            )->where(
+                $productEntityLinkField . ' IN (?)',
+                $existProductIds
+            )
         );
         foreach ($existingPrices as $existingPrice) {
             foreach ($prices as $sku => $skuPrices) {
@@ -591,8 +595,10 @@ protected function incrementCounterUpdated($prices, $existingPrice)
         foreach ($prices as $price) {
             if ($existingPrice['all_groups'] == $price['all_groups']
                 && $existingPrice['customer_group_id'] == $price['customer_group_id']
+                && (int) $existingPrice['qty'] == (int) $price['qty']
             ) {
                 $this->countItemsUpdated++;
+                continue;
             }
         }
     }

app/code/Magento/AdvancedPricingImportExport/Test/Unit/Model/Import/AdvancedPricingTest.php

@@ -921,7 +921,7 @@ public function testProcessCountExistingPrices(
         );
         $dbSelectMock = $this->createMock(\Magento\Framework\DB\Select::class);
         $this->connection->expects($this->once())
-            ->method('fetchAssoc')
+            ->method('fetchAll')
             ->willReturn($existingPrices);
         $this->connection->expects($this->once())
             ->method('select')
@@ -930,7 +930,7 @@ public function testProcessCountExistingPrices(
             ->method('from')
             ->with(
                 self::TABLE_NAME,
-                ['value_id', self::LINK_FIELD, 'all_groups', 'customer_group_id']
+                [self::LINK_FIELD, 'all_groups', 'customer_group_id', 'qty']
             )->willReturnSelf();
         $this->advancedPricing->expects($this->once())
             ->method('retrieveOldSkus')