merge

1 files changed, 9 insertions, 0 deletions

diff --git a/sql/item.h b/sql/item.h
index c6ef5bd349a..35180232592 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -894,6 +894,15 @@ public:
      (*traverser)(this, arg);
    }
 
+  /*
+    This is used to get the most recent version of any function in
+    an item tree. The version is the version where a MySQL function
+    was introduced in. So any function which is added should use
+    this function and set the int_arg to maximum of the input data
+    and their own version info.
+  */
+  virtual bool intro_version(uchar *int_arg) { return 0; }
+
   virtual bool remove_dependence_processor(uchar * arg) { return 0; }
   virtual bool remove_fixed(uchar * arg) { fixed= 0; return 0; }
   virtual bool cleanup_processor(uchar *arg);