Move folder

sources/Core/AttributeDefinition/iAttributeNoGroupBy.php

@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * Attributes implementing this interface won't be accepted as `group by` field
+ *
+ * @since 2.7.4 N°3473
+ */
+interface iAttributeNoGroupBy
+{
+    //no method, just a contract on implement
+}