MAGETWO-70062: Product price filter in admin shows incorrect product amount

  - Don't use price index for product grid on backend
  - Add integration test

Author: igrybkov

app/code/Magento/Catalog/Ui/DataProvider/Product/Collection.php

@@ -13,17 +13,16 @@
 class Collection extends \Magento\Catalog\Model\ResourceModel\Product\Collection
 {
     /**
-     * Join Product Price Table using left-join
+     * Disables using of price index for grid rendering
      *
-     * Customizes how price index joined to product collection in order to show disabled products in the list.
-     * It's needed as price index by its nature contains only values for enabled products.
-     * However, product grid requires to show all available products without any implicit filtering.
+     * Admin area shouldn't use price index and should rely on actual product data instead.
      *
      * @codeCoverageIgnore
      * @return \Magento\Catalog\Model\ResourceModel\Product\Collection
      */
     protected function _productLimitationJoinPrice()
     {
+        $this->_productLimitationFilters->setUsePriceIndex(false);
         return $this->_productLimitationPrice(true);
     }
 }

dev/tests/integration/testsuite/Magento/Catalog/Ui/DataProvider/ProductTest.php

@@ -0,0 +1,59 @@
+<?php
+/**
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Data\Collection;
+
+/**
+ * @magentoAppArea adminhtml
+ */
+class ProductTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \Magento\Catalog\Ui\DataProvider\Product\ProductDataProvider
+     */
+    private $dataProvider;
+
+    protected function setUp()
+    {
+        $this->dataProvider = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
+            \Magento\Catalog\Ui\DataProvider\Product\ProductDataProvider::class,
+            [
+                'name'=> 'products',
+                'primaryFieldName' => 'entity_id',
+                'requestFieldName' => 'id',
+            ]
+        );
+    }
+
+    /**
+     * @dataProvider sortingFieldsDataProvider
+     * @magentoDataFixture Magento/Catalog/_files/multiple_products.php
+     *
+     * @param string $orderByField
+     * @param string $direction
+     */
+    public function testSortingNotAffectsCount($orderByField, $direction)
+    {
+        $this->dataProvider->addOrder($orderByField, $direction);
+        $result = $this->dataProvider->getData();
+        $this->assertEquals(3, $result['totalRecords']);
+    }
+
+    /**
+     * @return array
+     */
+    public function sortingFieldsDataProvider()
+    {
+        return [
+            'name ASC' => ['name', Collection::SORT_ORDER_ASC],
+            'name DESC' => ['name', Collection::SORT_ORDER_DESC],
+            'sku ASC' => ['sku', Collection::SORT_ORDER_ASC],
+            'sku DESC' => ['sku', Collection::SORT_ORDER_DESC],
+            'price ASC' => ['price', Collection::SORT_ORDER_ASC],
+            'price DESC' => ['price', Collection::SORT_ORDER_DESC],
+        ];
+    }
+}