diff options
Diffstat (limited to 'sql/item_subselect.h')
| -rw-r--r-- | sql/item_subselect.h | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/sql/item_subselect.h b/sql/item_subselect.h index 648a1885814..7e46af09e2a 100644 --- a/sql/item_subselect.h +++ b/sql/item_subselect.h @@ -42,6 +42,8 @@ protected: subselect_engine *engine; /* allowed number of columns (1 for single value subqueries) */ uint max_columns; + /* work with 'substitution' */ + bool have_to_be_excluded; public: Item_subselect(); @@ -65,7 +67,7 @@ public: select_subselect *result); ~Item_subselect(); - virtual void assign_null() + virtual void reset() { null_value= 1; } @@ -109,7 +111,7 @@ public: decimals= item->decimals; res_type= item->res_type; } - virtual void assign_null() + virtual void reset() { null_value= 1; int_value= 0; @@ -143,7 +145,7 @@ public: } Item_exists_subselect(): Item_subselect() {} - virtual void assign_null() + virtual void reset() { value= 0; } @@ -154,6 +156,7 @@ public: double val(); String *val_str(String*); void fix_length_and_dec(); + friend class select_exists_subselect; }; @@ -163,14 +166,26 @@ class Item_in_subselect :public Item_exists_subselect { protected: Item * left_expr; - + bool was_null; public: Item_in_subselect(THD *thd, Item * left_expr, st_select_lex *select_lex); Item_in_subselect(Item_in_subselect *item); Item_in_subselect(): Item_exists_subselect() {} + void reset() + { + value= 0; + null_value= 0; + was_null= 0; + } virtual void select_transformer(st_select_lex *select_lex); void single_value_transformer(st_select_lex *select_lex, Item *left_expr, compare_func_creator func); + longlong val_int(); + double val(); + String *val_str(String*); + + friend class Item_asterisk_remover; + friend class Item_ref_null_helper; }; /* ALL/ANY/SOME subselect */ |