diff options
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sql/item.h b/sql/item.h index fb6bed75d51..5eeaa22a2a2 100644 --- a/sql/item.h +++ b/sql/item.h @@ -20,10 +20,11 @@ #endif struct st_table_list; -void item_init(void); /* Init item functions */ +void item_init(void); /* Init item functions */ class Item { - Item(const Item &); /* Prevent use of these */ + uint loop_id; /* Used to find selfrefering loops */ + Item(const Item &); /* Prevent use of these */ void operator=(Item &); public: static void *operator new(size_t size) {return (void*) sql_alloc((uint) size); } @@ -88,6 +89,8 @@ public: virtual CHARSET_INFO *charset() const { return str_value.charset(); }; virtual bool binary() const { return str_value.charset()->state & MY_CS_BINSORT ? 1 : 0 ; } virtual void set_charset(CHARSET_INFO *cs) { str_value.set_charset(cs); } + virtual bool check_loop(uint id); + virtual void top_level_item() {} }; @@ -434,6 +437,7 @@ public: void save_org_in_field(Field *field) { (*ref)->save_org_in_field(field); } enum Item_result result_type () const { return (*ref)->result_type(); } table_map used_tables() const { return (*ref)->used_tables(); } + bool check_loop(uint id); }; |