Ensure we print the most importaint violating function

sql/item.cc

@@ -1413,9 +1413,12 @@ bool mark_unsupported_function(const char *where, uchar *store, uint result)
 {
   Item::vcol_func_processor_result *res=
     (Item::vcol_func_processor_result*) store;
+  uint old_errors= res->errors;
   mark_unsupported_func(where, "check_vcol_func_processor");
   res->errors|= result;  /* Store type of expression */
-  res->name= where ? where : "";
+  /* Store the name to the highest violation (normally VCOL_IMPOSSIBLE) */
+  if (res->errors > old_errors)
+    res->name= where ? where : "";
   return false;
 }
 

sql/item.h

@@ -34,10 +34,10 @@ C_MODE_END
 
 /* Bits for type of vcol expression */
 #define VCOL_DETERMINISTIC     0                /* Normal (no bit set) */
-#define VCOL_NON_DETERMINISTIC 1
-#define VCOL_TIME_FUNC         2
-#define VCOL_IMPOSSIBLE        4
-#define VCOL_UNKNOWN	       8  /* UDF used; Need fix_fields() to know */
+#define VCOL_UNKNOWN           1  /* UDF used; Need fix_fields() to know */
+#define VCOL_NON_DETERMINISTIC 2
+#define VCOL_TIME_FUNC         4
+#define VCOL_IMPOSSIBLE        8
 
 class Protocol;
 struct TABLE_LIST;