vcol flag rename VCOL_UNKNOWN -> VCOL_FIELD_REF

sql/field.h

@@ -575,7 +575,7 @@ inline bool is_temporal_type_with_time(enum_field_types type)
 }
 
 /* Bits for type of vcol expression */
-#define VCOL_UNKNOWN           1  /* UDF used; Need fix_fields() to know */
+#define VCOL_FIELD_REF         1
 #define VCOL_NON_DETERMINISTIC 2
 #define VCOL_SESSION_FUNC      4  /* uses session data, e.g. USER or DAYNAME */
 #define VCOL_TIME_FUNC         8

sql/item.h

@@ -2516,8 +2516,8 @@ class Item_field :public Item_ident
   bool update_table_bitmaps_processor(void *arg);
   bool switch_to_nullable_fields_processor(void *arg);
   bool check_vcol_func_processor(void *arg)
-  { // may be, a special flag VCOL_FIELD ?
-    return mark_unsupported_function(field_name, arg, VCOL_UNKNOWN);
+  {
+    return mark_unsupported_function(field_name, arg, VCOL_FIELD_REF);
   }
   void cleanup();
   Item_equal *get_item_equal() { return item_equal; }

sql/item_func.h

@@ -1470,7 +1470,7 @@ class Item_udf_func :public Item_func
   virtual void print(String *str, enum_query_type query_type);
   bool check_vcol_func_processor(void *arg)
   {
-    return mark_unsupported_function(func_name(), "()", arg, VCOL_UNKNOWN);
+    return mark_unsupported_function(func_name(), "()", arg, VCOL_NON_DETERMINISTIC);
   }
 };