diff options
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 47 |
1 files changed, 34 insertions, 13 deletions
diff --git a/sql/item.h b/sql/item.h index 2cadfda6895..0f49145082f 100644 --- a/sql/item.h +++ b/sql/item.h @@ -697,9 +697,16 @@ public: Any new item which can be NULL must implement this call. */ virtual bool is_null() { return 0; } + /* - it is "top level" item of WHERE clause and we do not need correct NULL - handling + Inform the item that there will be no distinction between its result + being FALSE or NULL. + + NOTE + This function will be called for eg. Items that are top-level AND-parts + of the WHERE clause. Items implementing this function (currently + Item_cond_and and subquery-related item) enable special optimizations + when they are "top level". */ virtual void top_level_item() {} /* @@ -827,13 +834,6 @@ protected: public: LEX_STRING m_name; - /* - Buffer, pointing to the string value of the item. We need it to - protect internal buffer from changes. See comment to analogous - member in Item_param for more details. - */ - String str_value_ptr; - public: #ifndef DBUG_OFF /* @@ -1075,12 +1075,11 @@ public: }; bool agg_item_collations(DTCollation &c, const char *name, - Item **items, uint nitems, uint flags= 0); + Item **items, uint nitems, uint flags, int item_sep); bool agg_item_collations_for_comparison(DTCollation &c, const char *name, - Item **items, uint nitems, - uint flags= 0); + Item **items, uint nitems, uint flags); bool agg_item_charsets(DTCollation &c, const char *name, - Item **items, uint nitems, uint flags= 0); + Item **items, uint nitems, uint flags, int item_sep); class Item_num: public Item @@ -1142,6 +1141,28 @@ public: bool any_privileges); }; + +class Item_ident_for_show :public Item +{ +public: + Field *field; + const char *db_name; + const char *table_name; + + Item_ident_for_show(Field *par_field, const char *db_arg, + const char *table_name_arg) + :field(par_field), db_name(db_arg), table_name(table_name_arg) + {} + + enum Type type() const { return FIELD_ITEM; } + double val_real() { return field->val_real(); } + longlong val_int() { return field->val_int(); } + String *val_str(String *str) { return field->val_str(str); } + my_decimal *val_decimal(my_decimal *dec) { return field->val_decimal(dec); } + void make_field(Send_field *tmp_field); +}; + + class Item_equal; class COND_EQUAL; |