MAGETWO-52124: Simple product special price lost if use it in grouped product

Author: kandy

app/code/Magento/GroupedProduct/Setup/UpgradeData.php

@@ -0,0 +1,58 @@
+<?php
+/**
+ * Copyright © 2016 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\GroupedProduct\Setup;
+
+use Magento\Catalog\Model\ResourceModel\Product\Relation;
+use Magento\Framework\DB\Adapter\AdapterInterface;
+use Magento\Framework\Setup\ModuleContextInterface;
+use Magento\Framework\Setup\ModuleDataSetupInterface;
+use Magento\Framework\Setup\UpgradeDataInterface;
+use Magento\GroupedProduct\Model\ResourceModel\Product\Link;
+
+class UpgradeData implements UpgradeDataInterface
+{
+    /**
+     * @var Relation
+     */
+    private $relationProcessor;
+
+    /**
+     * UpgradeData constructor
+     * @param Relation $relationProcessor
+     */
+    public function __construct(Relation $relationProcessor)
+    {
+        $this->relationProcessor = $relationProcessor;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
+    {
+        $setup->startSetup();
+
+        if (version_compare($context->getVersion(), '2.0.1', '<')) {
+            $connection = $setup->getConnection();
+            $select = $connection->select()
+                ->from(
+                    $this->relationProcessor->getTable('catalog_product_link'),
+                    ['product_id', 'linked_product_id']
+                )
+                ->where('link_type_id = ?', Link::LINK_TYPE_GROUPED);
+
+            $connection->query(
+                $connection->insertFromSelect(
+                    $select, $this->relationProcessor->getMainTable(),
+                    ['parent_id', 'child_id'],
+                    AdapterInterface::INSERT_IGNORE
+                )
+            );
+        }
+
+        $setup->endSetup();
+    }
+}

app/code/Magento/GroupedProduct/etc/module.xml

@@ -6,7 +6,7 @@
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
-    <module name="Magento_GroupedProduct" setup_version="2.0.0">
+    <module name="Magento_GroupedProduct" setup_version="2.0.1">
         <sequence>
             <module name="Magento_Catalog"/>
             <module name="Magento_CatalogInventory"/>