1 files changed, 5 insertions, 0 deletions
diff --git a/sql/item.h b/sql/item.h
index e7086a5cbb3..6f22c05b308 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -4816,6 +4816,11 @@ public:
   virtual double val_real() = 0;
   virtual longlong val_int() = 0;
   virtual int save_in_field(Field *field, bool no_conversions) = 0;
+  bool walk(Item_processor processor, bool walk_subquery, void *args)
+  {
+    return (item->walk(processor, walk_subquery, args)) ||
+      (this->*processor)(args);
+  }
 };
 
 /**