MAGETWO-94671: Product Export fails

Author: vzabaznov

app/code/Magento/CatalogImportExport/Model/Export/Product.php

@@ -546,14 +546,14 @@ protected function getMediaGallery(array $productIds)
                 'mgv.store_id',
             ]
         )->where(
-            "mgvte.{$this->getProductEntityLinkField()} IN (?)",
+            "mgvte.$productEntityJoinField IN (?)",
             $productIds
         );
 
         $rowMediaGallery = [];
         $stmt = $this->_connection->query($select);
         while ($mediaRow = $stmt->fetch()) {
-            $rowMediaGallery[$mediaRow[$this->getProductEntityLinkField()]][] = [
+            $rowMediaGallery[$mediaRow[$productEntityJoinField]][] = [
                 '_media_attribute_id' => $mediaRow['attribute_id'],
                 '_media_image' => $mediaRow['filename'],
                 '_media_label' => $mediaRow['label'],