Merge pull request #2451 from magento-performance/MAGETWO-90575

[PERFORMANCE] Use price index to calculate price for configurable products

Author: duhon

app/code/Magento/ConfigurableProduct/Model/ResourceModel/Product/LinkedProductSelectBuilderComposite.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\ConfigurableProduct\Model\ResourceModel\Product;
+
+use Magento\Catalog\Model\ResourceModel\Product\LinkedProductSelectBuilderInterface;
+
+/**
+ * Used in Magento\ConfigurableProduct\Pricing\Price\LowestPriceOptionsProvider
+ * to provide queries to select configurable product option with lowest price
+ *
+ * @see app/code/Magento/ConfigurableProduct/etc/di.xml
+ */
+class LinkedProductSelectBuilderComposite implements LinkedProductSelectBuilderInterface
+{
+    /**
+     * @var LinkedProductSelectBuilderInterface[]
+     */
+    private $linkedProductSelectBuilder;
+
+    /**
+     * @param LinkedProductSelectBuilderInterface[] $linkedProductSelectBuilder
+     */
+    public function __construct($linkedProductSelectBuilder)
+    {
+        $this->linkedProductSelectBuilder = $linkedProductSelectBuilder;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function build($productId)
+    {
+        $selects = [];
+        foreach ($this->linkedProductSelectBuilder as $productSelectBuilder) {
+            $selects = array_merge($selects, $productSelectBuilder->build($productId));
+        }
+
+        return $selects;
+    }
+}

app/code/Magento/ConfigurableProduct/etc/di.xml

@@ -189,6 +189,13 @@
             <argument name="productIndexer" xsi:type="object">Magento\Catalog\Model\Indexer\Product\Full</argument>
         </arguments>
     </type>
+    <virtualType name="LinkedProductSelectBuilderByIndexMinPrice" type="Magento\ConfigurableProduct\Model\ResourceModel\Product\LinkedProductSelectBuilderComposite">
+        <arguments>
+            <argument name="linkedProductSelectBuilder" xsi:type="array">
+                <item name="indexPrice" xsi:type="object">Magento\Catalog\Model\ResourceModel\Product\Indexer\LinkedProductSelectBuilderByIndexPrice</item>
+            </argument>
+        </arguments>
+    </virtualType>
     <type name="Magento\ConfigurableProduct\Pricing\Price\LowestPriceOptionsProvider">
         <arguments>
             <argument name="linkedProductSelectBuilder" xsi:type="object">Magento\ConfigurableProduct\Model\ResourceModel\Product\LinkedProductSelectBuilder</argument>
@@ -197,6 +204,7 @@
     <type name="Magento\ConfigurableProduct\Model\ResourceModel\Product\LinkedProductSelectBuilder">
         <arguments>
             <argument name="baseSelectProcessor" xsi:type="object">Magento\ConfigurableProduct\Model\ResourceModel\Product\StockStatusBaseSelectProcessor</argument>
+            <argument name="linkedProductSelectBuilder" xsi:type="object">LinkedProductSelectBuilderByIndexMinPrice</argument>
         </arguments>
     </type>
     <type name="Magento\Catalog\Model\Product\Pricing\Renderer\SalableResolver">