diff options
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 56 |
1 files changed, 51 insertions, 5 deletions
diff --git a/sql/item.h b/sql/item.h index 84fd4b5ce24..5527ffd9ca1 100644 --- a/sql/item.h +++ b/sql/item.h @@ -822,6 +822,7 @@ public: class Field_enumerator) */ virtual table_map used_tables() const { return (table_map) 0L; } + virtual table_map all_used_tables() const { return used_tables(); } /* Return table map of tables that can't be NULL tables (tables that are used in a context where if they would contain a NULL row generated @@ -979,10 +980,13 @@ public: virtual bool reset_query_id_processor(uchar *query_id_arg) { return 0; } virtual bool is_expensive_processor(uchar *arg) { return 0; } virtual bool register_field_in_read_map(uchar *arg) { return 0; } + virtual bool register_field_in_write_map(uchar *arg) { return 0; } virtual bool enumerate_field_refs_processor(uchar *arg) { return 0; } virtual bool mark_as_eliminated_processor(uchar *arg) { return 0; } virtual bool eliminate_subselect_processor(uchar *arg) { return 0; } virtual bool set_fake_select_as_master_processor(uchar *arg) { return 0; } + virtual bool view_used_tables_processor(uchar *arg) { return 0; } + virtual bool eval_not_null_tables(uchar *opt_arg) { return 0; } /* To call bool function for all arguments */ struct bool_func_call_args @@ -998,6 +1002,7 @@ public: (this->*(info->bool_function))(); return FALSE; } + /* The next function differs from the previous one that a bitmap to be updated is passed as uchar *arg. @@ -1076,6 +1081,7 @@ public: *arg= NULL; return TRUE; } + /* @brief Processor used to check acceptability of an item in the defining @@ -1209,8 +1215,8 @@ public: { return Field::GEOM_GEOMETRY; }; String *check_well_formed_result(String *str, bool send_error= 0); bool eq_by_collation(Item *item, bool binary_cmp, CHARSET_INFO *cs); - Item* set_expr_cache(THD *thd, List<Item*> &depends_on); + virtual Item *get_cached_item() { return NULL; } virtual Item_equal *get_item_equal() { return NULL; } virtual void set_item_equal(Item_equal *item_eq) {}; @@ -1225,6 +1231,13 @@ public: join_tab_idx= join_tab_idx_arg; } virtual uint get_join_tab_idx() { return join_tab_idx; } + + table_map view_used_tables(TABLE_LIST *view) + { + view->view_used_tables= 0; + walk(&Item::view_used_tables_processor, 0, (uchar *) view); + return view->view_used_tables; + } }; @@ -1711,6 +1724,7 @@ public: int save_in_field(Field *field,bool no_conversions); void save_org_in_field(Field *field); table_map used_tables() const; + table_map all_used_tables() const; enum Item_result result_type () const { return field->result_type(); @@ -1740,6 +1754,7 @@ public: bool add_field_to_set_processor(uchar * arg); bool find_item_in_field_list_processor(uchar *arg); bool register_field_in_read_map(uchar *arg); + bool register_field_in_write_map(uchar *arg); bool register_field_in_bitmap(uchar *arg); bool check_partition_func_processor(uchar *int_arg) {return FALSE;} bool vcol_in_partition_func_processor(uchar *bool_arg); @@ -2515,7 +2530,7 @@ public: } void update_used_tables() { - if (!depended_from) + if (!depended_from) (*ref)->update_used_tables(); } bool const_item() const @@ -2806,12 +2821,14 @@ public: class Item_direct_view_ref :public Item_direct_ref { Item_equal *item_equal; + TABLE_LIST *view; public: Item_direct_view_ref(Name_resolution_context *context_arg, Item **item, - const char *table_name_arg, - const char *field_name_arg) + const char *table_name_arg, + const char *field_name_arg, + TABLE_LIST *view_arg) :Item_direct_ref(context_arg, item, table_name_arg, field_name_arg), - item_equal(0) {} + item_equal(0), view(view_arg) {} /* Constructor need to process subselect with temporary tables (see Item) */ Item_direct_view_ref(THD *thd, Item_direct_ref *item) :Item_direct_ref(thd, item), item_equal(0) {} @@ -2835,6 +2852,24 @@ public: bool subst_argument_checker(uchar **arg); Item *equal_fields_propagator(uchar *arg); Item *replace_equal_field(uchar *arg); + table_map used_tables() const + { + return depended_from ? + OUTER_REF_TABLE_BIT : + (view->merged ? (*ref)->used_tables() : view->table->map); + } + bool walk(Item_processor processor, bool walk_subquery, uchar *arg) + { + return (*ref)->walk(processor, walk_subquery, arg) || + (this->*processor)(arg); + } + bool view_used_tables_processor(uchar *arg) + { + TABLE_LIST *view_arg= (TABLE_LIST *) arg; + if (view_arg == view) + view_arg->view_used_tables|= (*ref)->used_tables(); + return 0; + } }; @@ -3191,6 +3226,17 @@ public: value. */ +/* + Cached_item_XXX objects are not exactly caches. They do the following: + + Each Cached_item_XXX object has + - its source item + - saved value of the source item + - cmp() method that compares the saved value with the current value of the + source item, and if they were not equal saves item's value into the saved + value. +*/ + class Cached_item :public Sql_alloc { public: |