MAGETWO-93258: Optimize retrieving product attributes

Author: mslabko

app/code/Magento/Eav/Model/ResourceModel/UpdateHandler.php

@@ -123,6 +123,9 @@ public function execute($entityType, $entityData, $arguments = [])
             $attributeSetId = isset($entityData[AttributeLoader::ATTRIBUTE_SET_ID])
                 ? $entityData[AttributeLoader::ATTRIBUTE_SET_ID]
                 : null; // @todo verify is it normal to not have attribute_set_id
+            if (!isset($entityDataForSnapshot['attribute_set_id'])) {
+                $entityDataForSnapshot['attribute_set_id'] = $attributeSetId;
+            }
             $snapshot = $this->readSnapshot->execute($entityType, $entityDataForSnapshot);
             foreach ($this->getAttributes($entityType, $attributeSetId) as $attribute) {
                 $code = $attribute->getAttributeCode();