MAGETWO-63945: Add extension point to sales grid indexer

- Add constraints for sales_order_grid

Author: viktym

app/code/Magento/Sales/Model/ResourceModel/Provider/UpdatedIdListProvider.php

@@ -6,6 +6,7 @@
 namespace Magento\Sales\Model\ResourceModel\Provider;
 
 use Magento\Framework\App\ResourceConnection;
+use Magento\Framework\DB\Adapter\AdapterInterface;
 
 /**
  * Provides latest updated entities ids list
@@ -17,6 +18,11 @@ class UpdatedIdListProvider implements IdListProviderInterface
      */
     private $resourceConnection;
 
+    /**
+     * @var AdapterInterface
+     */
+    private $connection;
+
     /**
      * IdListProvider constructor.
      * @param ResourceConnection $resourceConnection
@@ -58,10 +64,16 @@ private function getLastUpdatedAtValue($gridTableName)
     }
 
     /**
-     * @return \Magento\Framework\DB\Adapter\AdapterInterface
+     * Returns connection.
+     *
+     * @return AdapterInterface
      */
     private function getConnection()
     {
-        return $this->resourceConnection->getConnection();
+        if (!$this->connection) {
+            $this->connection = $this->resourceConnection->getConnection('sales');
+        }
+
+        return $this->connection;
     }
 }

dev/tests/integration/testsuite/Magento/Sales/Model/ResourceModel/GridTest.php

@@ -32,6 +32,8 @@ protected function setUp()
     /**
      * Tests asynchronous insertion of the new entity into order grid.
      *
+     * @magentoDbIsolation enabled
+     * @magentoAppIsolation enabled
      * @magentoDataFixture Magento/Sales/_files/order_async.php
      */
     public function testRefreshByScheduleAsyncModeSuccess()