Fixed LP bug #1002157.

The class Item_func missed an implementation of the virtual 
function update_null_value.
Back-ported the fix for bug 62125 from mysql 5.6 code line.
The test case was also back-ported. 

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/item_func.h b/sql/item_func.h
index f91107c5445..cb9c1929d7d 100644
--- a/sql/item_func.h
+++ b/sql/item_func.h
@@ -1941,6 +1941,11 @@ public:
     return str;
   }
 
+  void update_null_value()
+  { 
+    execute();
+  }
+
   virtual bool change_context_processor(uchar *cntx)
     { context= (Name_resolution_context *)cntx; return FALSE; }
 
@@ -1955,6 +1960,7 @@ public:
   {
     return sp_result_field;
   }
+
   bool check_vcol_func_processor(uchar *int_arg) 
   {
     return trace_unsupported_by_check_vcol_func_processor(func_name());