diff options
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 90 |
1 files changed, 54 insertions, 36 deletions
diff --git a/sql/item.h b/sql/item.h index b3cf9aa6e4c..e1c380a2a55 100644 --- a/sql/item.h +++ b/sql/item.h @@ -113,7 +113,6 @@ public: } }; - /*************************************************************************/ /* A framework to easily handle different return types for hybrid items @@ -769,20 +768,24 @@ public: */ virtual bool const_during_execution() const { return (used_tables() & ~PARAM_TABLE_BIT) == 0; } - /* - This is an essential method for correct functioning of VIEWS. - To save a view in an .frm file we need its unequivocal - definition in SQL that takes into account sql_mode and - environmental settings. Currently such definition is restored - by traversing through the parsed tree of a view and - print()'ing SQL syntax of every node to a String buffer. This - method is used to print the SQL definition of an item. The - second use of this method is for EXPLAIN EXTENDED, to print - the SQL of a query after all optimizations of the parsed tree - have been done. - */ - virtual void print(String *str_arg) { str_arg->append(full_name()); } - void print_item_w_name(String *); + + /** + This method is used for to: + - to generate a view definition query (SELECT-statement); + - to generate a SQL-query for EXPLAIN EXTENDED; + - to generate a SQL-query to be shown in INFORMATION_SCHEMA; + - debug. + + For more information about view definition query, INFORMATION_SCHEMA + query and why they should be generated from the Item-tree, @see + mysql_register_view(). + */ + virtual inline void print(String *str, enum_query_type query_type) + { + str->append(full_name()); + } + + void print_item_w_name(String *, enum_query_type query_type); virtual void update_used_tables() {} virtual void split_sum_func(THD *thd, Item **ref_pointer_array, List<Item> &fields) {} @@ -1134,7 +1137,7 @@ public: const Item *this_item() const; Item **this_item_addr(THD *thd, Item **); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); public: inline const LEX_STRING *my_name() const; @@ -1203,7 +1206,7 @@ public: Item_case_expr can not occur in views, so here it is only for debug purposes. */ - void print(String *str); + virtual void print(String *str, enum_query_type query_type); private: uint m_case_expr_id; @@ -1261,7 +1264,7 @@ public: String *val_str(String *sp); my_decimal *val_decimal(my_decimal *); bool is_null(); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); Item_result result_type() const { @@ -1343,7 +1346,7 @@ public: const char *full_name() const; void cleanup(); bool remove_dependence_processor(uchar * arg); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); virtual bool change_context_processor(uchar *cntx) { context= (Name_resolution_context *)cntx; return FALSE; } friend bool insert_fields(THD *thd, Name_resolution_context *context, @@ -1473,7 +1476,7 @@ public: Item *safe_charset_converter(CHARSET_INFO *tocs); int fix_outer_field(THD *thd, Field **field, Item **reference); virtual Item *update_value_transformer(uchar *select_arg); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); Field::geometry_type get_geometry_type() const { DBUG_ASSERT(field_type() == MYSQL_TYPE_GEOMETRY); @@ -1511,7 +1514,12 @@ public: bool basic_const_item() const { return 1; } Item *clone_item() { return new Item_null(name); } bool is_null() { return 1; } - void print(String *str) { str->append(STRING_WITH_LEN("NULL")); } + + virtual inline void print(String *str, enum_query_type query_type) + { + str->append(STRING_WITH_LEN("NULL")); + } + Item *safe_charset_converter(CHARSET_INFO *tocs); bool check_partition_func_processor(uchar *int_arg) {return FALSE;} }; @@ -1645,7 +1653,7 @@ public: */ virtual table_map used_tables() const { return state != NO_VALUE ? (table_map)0 : PARAM_TABLE_BIT; } - void print(String *str); + virtual void print(String *str, enum_query_type query_type); bool is_null() { DBUG_ASSERT(state != NO_VALUE); return state == NULL_VALUE; } bool basic_const_item() const; @@ -1703,7 +1711,7 @@ public: Item *clone_item() { return new Item_int(name,value,max_length); } // to prevent drop fixed flag (no need parent cleanup call) void cleanup() {} - void print(String *str); + virtual void print(String *str, enum_query_type query_type); Item_num *neg() { value= -value; return this; } uint decimal_precision() const { return (uint)(max_length - test(value < 0)); } @@ -1723,7 +1731,7 @@ public: String *val_str(String*); Item *clone_item() { return new Item_uint(name, value, max_length); } int save_in_field(Field *field, bool no_conversions); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); Item_num *neg (); uint decimal_precision() const { return max_length; } bool check_partition_func_processor(uchar *bool_arg) { return FALSE;} @@ -1759,7 +1767,7 @@ public: } // to prevent drop fixed flag (no need parent cleanup call) void cleanup() {} - void print(String *str); + virtual void print(String *str, enum_query_type query_type); Item_num *neg() { my_decimal_neg(&decimal_value); @@ -1818,7 +1826,7 @@ public: Item *clone_item() { return new Item_float(name, value, decimals, max_length); } Item_num *neg() { value= -value; return this; } - void print(String *str); + virtual void print(String *str, enum_query_type query_type); bool eq(const Item *, bool binary_cmp) const; }; @@ -1831,7 +1839,12 @@ public: uint length) :Item_float(NullS, val_arg, decimal_par, length), func_name(str) {} - void print(String *str) { str->append(func_name); } + + virtual inline void print(String *str, enum_query_type query_type) + { + str->append(func_name); + } + Item *safe_charset_converter(CHARSET_INFO *tocs); }; @@ -1922,7 +1935,7 @@ public: str_value.append(str, length); max_length= str_value.numchars() * collation.collation->mbmaxlen; } - void print(String *str); + virtual void print(String *str, enum_query_type query_type); // to prevent drop fixed flag (no need parent cleanup call) void cleanup() {} bool check_partition_func_processor(uchar *int_arg) {return FALSE;} @@ -1981,7 +1994,12 @@ public: :Item_string(NullS, str, length, cs, dv), func_name(name_par) {} Item *safe_charset_converter(CHARSET_INFO *tocs); - void print(String *str) { str->append(func_name); } + + virtual inline void print(String *str, enum_query_type query_type) + { + str->append(func_name); + } + bool check_partition_func_processor(uchar *int_arg) {return TRUE;} }; @@ -2071,7 +2089,7 @@ public: enum_field_types field_type() const { return MYSQL_TYPE_VARCHAR; } // to prevent drop fixed flag (no need parent cleanup call) void cleanup() {} - void print(String *str); + virtual void print(String *str, enum_query_type query_type); bool eq(const Item *item, bool binary_cmp) const; virtual Item *safe_charset_converter(CHARSET_INFO *tocs); bool check_partition_func_processor(uchar *int_arg) {return FALSE;} @@ -2192,7 +2210,7 @@ public: } bool walk(Item_processor processor, bool walk_subquery, uchar *arg) { return (*ref)->walk(processor, walk_subquery, arg); } - void print(String *str); + virtual void print(String *str, enum_query_type query_type); bool result_as_longlong() { return (*ref)->result_as_longlong(); @@ -2339,7 +2357,7 @@ public: my_decimal *val_decimal(my_decimal *); bool val_bool(); bool get_date(MYSQL_TIME *ltime, uint fuzzydate); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); /* we add RAND_TABLE_BIT to prevent moving this item from HAVING to WHERE */ @@ -2514,7 +2532,7 @@ public: enum Type type() const { return DEFAULT_VALUE_ITEM; } bool eq(const Item *item, bool binary_cmp) const; bool fix_fields(THD *, Item **); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); int save_in_field(Field *field_arg, bool no_conversions); table_map used_tables() const { return (table_map)0L; } @@ -2547,7 +2565,7 @@ public: arg(a) {} bool eq(const Item *item, bool binary_cmp) const; bool fix_fields(THD *, Item **); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); int save_in_field(Field *field_arg, bool no_conversions) { return Item_field::save_in_field(field_arg, no_conversions); @@ -2618,7 +2636,7 @@ public: enum Type type() const { return TRIGGER_FIELD_ITEM; } bool eq(const Item *item, bool binary_cmp) const; bool fix_fields(THD *, Item **); - void print(String *str); + virtual void print(String *str, enum_query_type query_type); table_map used_tables() const { return (table_map)0L; } Field *get_tmp_table_field() { return 0; } Item *copy_or_same(THD *thd) { return this; } @@ -2711,7 +2729,7 @@ public: virtual void keep_array() {} // to prevent drop fixed flag (no need parent cleanup call) void cleanup() {} - void print(String *str); + virtual void print(String *str, enum_query_type query_type); bool eq_def(Field *field) { return cached_field ? cached_field->eq_def (field) : FALSE; |