MAGETWO-65099: [Performance] Optimize validation of swatches attributes

Author: Valeriy Nayda

app/code/Magento/Swatches/Block/Product/Renderer/Configurable.php

@@ -224,6 +224,8 @@ protected function initIsProductHasSwatchAttribute()
     }
 
     /**
+     * Check that product has at least one swatch attribute
+     *
      * @return bool
      */
     protected function isProductHasSwatchAttribute()
@@ -413,7 +415,10 @@ protected function _toHtml()
     }
 
     /**
-     * @codeCoverageIgnore
+     * Return renderer template
+     *
+     * Template for product with swatches is different from product without swatches
+     *
      * @return string
      */
     protected function getRendererTemplate()

app/code/Magento/Swatches/Model/SwatchAttributeCodes.php

@@ -99,7 +99,7 @@ private function loadSwatchAttributeCodes()
                 ]
             )->where(
                 'a.attribute_id IN (?)',
-                new \Zend_Db_Expr(sprintf('(%s)', $this->getAttributeIdsSelect()))
+                (string)$this->getAttributeIdsSelect()
             );
         $result = $this->resourceConnection->getConnection()->fetchPairs($select);
         return $result;