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MySQL 5.6.14 Source Code Document
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MySQL 5.6.14 Source Code Document
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#include <item.h>
Public Member Functions | |
| Item_null_result (enum_field_types fld_type, Item_result res_type) | |
| bool | is_result_field () |
| void | save_in_result_field (bool no_conversions) |
| bool | check_partition_func_processor (uchar *int_arg) |
| enum_field_types | field_type () const |
| Item_result | result_type () const |
 Public Member Functions inherited from Item_null | |
| Item_null (const Name_string &name_par) | |
| enum Type | type () const |
| bool | eq (const Item *item, bool binary_cmp) const |
| double | val_real () |
| longlong | val_int () |
| longlong | val_time_temporal () |
| longlong | val_date_temporal () |
| String * | val_str (String *str) |
| my_decimal * | val_decimal (my_decimal *) |
| bool | get_date (MYSQL_TIME *ltime, uint fuzzydate) |
| bool | get_time (MYSQL_TIME *ltime) |
| type_conversion_status | save_in_field (Field *field, bool no_conversions) |
| type_conversion_status | save_safe_in_field (Field *field) |
| bool | send (Protocol *protocol, String *str) |
| bool | basic_const_item () const |
| Item * | clone_item () |
| bool | is_null () |
| virtual void | print (String *str, enum_query_type query_type) |
| Item * | safe_charset_converter (const CHARSET_INFO *tocs) |
| Public Member Functions inherited from Item_basic_constant | |
| void | set_used_tables (table_map map) |
| table_map | used_tables () const |
| void | cleanup () |
| Public Member Functions inherited from Item | |
| Item (THD *thd, Item *item) | |
| void | rename (char *new_name) |
| void | init_make_field (Send_field *tmp_field, enum enum_field_types type) |
| virtual void | make_field (Send_field *field) |
| virtual Field * | make_string_field (TABLE *table) |
| virtual bool | fix_fields (THD *, Item **) |
| virtual void | fix_after_pullout (st_select_lex *parent_select, st_select_lex *removed_select) |
| void | quick_fix_field () |
| type_conversion_status | save_in_field_no_warnings (Field *field, bool no_conversions) |
| virtual void | save_org_in_field (Field *field) |
| virtual enum Item_result | numeric_context_result_type () const |
| enum Item_result | temporal_with_date_as_number_result_type () const |
| virtual Item_result | cast_to_int_type () const |
| virtual enum_field_types | string_field_type () const |
| virtual enum_monotonicity_info | get_monotonicity_info () const |
| virtual longlong | val_int_endpoint (bool left_endp, bool *incl_endp) |
| longlong | val_temporal_by_field_type () |
| longlong | val_temporal_with_round (enum_field_types type, uint8 dec) |
| ulonglong | val_uint () |
| virtual String * | val_str_ascii (String *str) |
| virtual bool | val_bool () |
| virtual String * | val_nodeset (String *) |
| type_conversion_status | save_time_in_field (Field *field) |
| type_conversion_status | save_date_in_field (Field *field) |
| type_conversion_status | save_str_value_in_field (Field *field, String *result) |
| virtual Field * | get_tmp_table_field () |
| virtual Field * | tmp_table_field (TABLE *t_arg) |
| virtual const char * | full_name () const |
| virtual double | val_result () |
| virtual longlong | val_int_result () |
| virtual longlong | val_time_temporal_result () |
| virtual longlong | val_date_temporal_result () |
| virtual String * | str_result (String *tmp) |
| virtual my_decimal * | val_decimal_result (my_decimal *val) |
| virtual bool | val_bool_result () |
| virtual bool | is_null_result () |
| virtual table_map | resolved_used_tables () const |
| virtual table_map | not_null_tables () const |
| virtual cond_result | eq_cmp_result () const |
| uint | float_length (uint decimals_par) const |
| virtual uint | decimal_precision () const |
| int | decimal_int_part () const |
| virtual uint | time_precision () |
| virtual uint | datetime_precision () |
| virtual bool | const_item () const |
| virtual bool | const_during_execution () const |
| void | print_item_w_name (String *, enum_query_type query_type) |
| void | print_for_order (String *str, enum_query_type query_type, bool used_alias) |
| virtual void | update_used_tables () |
| virtual void | split_sum_func (THD *thd, Ref_ptr_array ref_pointer_array, List< Item > &fields) |
| void | split_sum_func2 (THD *thd, Ref_ptr_array ref_pointer_array, List< Item > &fields, Item **ref, bool skip_registered) |
| virtual bool | get_timeval (struct timeval *tm, int *warnings) |
| virtual bool | get_date_result (MYSQL_TIME *ltime, uint fuzzydate) |
| virtual void | update_null_value () |
| virtual void | top_level_item () |
| virtual void | set_result_field (Field *field) |
| virtual bool | is_bool_func () |
| virtual void | no_rows_in_result () |
| virtual Item * | copy_or_same (THD *thd) |
| virtual Item * | copy_andor_structure (THD *thd, bool real_items=false) |
| virtual Item * | real_item () |
| virtual Item * | get_tmp_table_item (THD *thd) |
| virtual const CHARSET_INFO * | compare_collation () |
| virtual const CHARSET_INFO * | charset_for_protocol (void) const |
| virtual bool | walk (Item_processor processor, bool walk_subquery, uchar *arg) |
| virtual Item * | transform (Item_transformer transformer, uchar *arg) |
| virtual Item * | compile (Item_analyzer analyzer, uchar **arg_p, Item_transformer transformer, uchar *arg_t) |
| virtual void | traverse_cond (Cond_traverser traverser, void *arg, traverse_order order) |
| virtual bool | intro_version (uchar *int_arg) |
| virtual bool | remove_dependence_processor (uchar *arg) |
| virtual bool | remove_fixed (uchar *arg) |
| virtual bool | cleanup_processor (uchar *arg) |
| virtual bool | collect_item_field_processor (uchar *arg) |
| virtual bool | add_field_to_set_processor (uchar *arg) |
| virtual bool | remove_column_from_bitmap (uchar *arg) |
| virtual bool | find_item_in_field_list_processor (uchar *arg) |
| virtual bool | change_context_processor (uchar *context) |
| virtual bool | reset_query_id_processor (uchar *query_id_arg) |
| virtual bool | find_item_processor (uchar *arg) |
| virtual bool | register_field_in_read_map (uchar *arg) |
| virtual bool | inform_item_in_cond_of_tab (uchar *join_tab_index) |
| virtual bool | clean_up_after_removal (uchar *arg) |
| virtual bool | cache_const_expr_analyzer (uchar **arg) |
| virtual Item * | cache_const_expr_transformer (uchar *arg) |
| virtual bool | item_field_by_name_analyzer (uchar **arg) |
| virtual Item * | item_field_by_name_transformer (uchar *arg) |
| virtual bool | equality_substitution_analyzer (uchar **arg) |
| virtual Item * | equality_substitution_transformer (uchar *arg) |
| virtual bool | subst_argument_checker (uchar **arg) |
| virtual bool | explain_subquery_checker (uchar **arg) |
| virtual Item * | explain_subquery_propagator (uchar *arg) |
| virtual Item * | equal_fields_propagator (uchar *arg) |
| virtual bool | set_no_const_sub (uchar *arg) |
| virtual Item * | replace_equal_field (uchar *arg) |
| virtual bool | check_valid_arguments_processor (uchar *bool_arg) |
| virtual bool | find_function_processor (uchar *arg) |
| virtual Item * | this_item () |
| virtual const Item * | this_item () const |
| virtual Item ** | this_item_addr (THD *thd, Item **addr_arg) |
| virtual uint | cols () |
| virtual Item * | element_index (uint i) |
| virtual Item ** | addr (uint i) |
| virtual bool | check_cols (uint c) |
| virtual bool | null_inside () |
| virtual void | bring_value () |
| Field * | tmp_table_field_from_field_type (TABLE *table, bool fixed_length) |
| virtual Item_field * | field_for_view_update () |
| virtual Item * | neg_transformer (THD *thd) |
| virtual Item * | update_value_transformer (uchar *select_arg) |
| void | delete_self () |
| virtual bool | is_splocal () |
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virtual Settable_routine_parameter * | get_settable_routine_parameter () |
| bool | is_temporal_with_date () const |
| bool | is_temporal_with_date_and_time () const |
| bool | is_temporal_with_time () const |
| bool | is_temporal () const |
| bool | has_compatible_context (Item *item) const |
| virtual Field::geometry_type | get_geometry_type () const |
| String * | check_well_formed_result (String *str, bool send_error=0) |
| bool | eq_by_collation (Item *item, bool binary_cmp, const CHARSET_INFO *cs) |
| virtual bool | is_expensive () |
| virtual bool | can_be_evaluated_now () const |
| uint32 | max_char_length () const |
| void | fix_length_and_charset (uint32 max_char_length_arg, const CHARSET_INFO *cs) |
| void | fix_char_length (uint32 max_char_length_arg) |
| void | fix_char_length_ulonglong (ulonglong max_char_length_arg) |
| void | fix_length_and_charset_datetime (uint32 max_char_length_arg) |
| void | fix_length_and_dec_and_charset_datetime (uint32 max_char_length_arg, uint8 dec_arg) |
| virtual bool | is_outer_field () const |
| bool | is_blob_field () const |
| virtual bool | has_subquery () const |
| virtual bool | has_stored_program () const |
| virtual bool | created_by_in2exists () const |
| Whether this Item was created by the IN->EXISTS subquery transformation. | |
Public Attributes | |
| Field * | result_field |
Additional Inherited Members | |
| Public Types inherited from Item | |
| enum | Type { FIELD_ITEM = 0, FUNC_ITEM, SUM_FUNC_ITEM, STRING_ITEM, INT_ITEM, REAL_ITEM, NULL_ITEM, VARBIN_ITEM, COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_VALUE_ITEM, PROC_ITEM, COND_ITEM, REF_ITEM, FIELD_STD_ITEM, FIELD_VARIANCE_ITEM, INSERT_VALUE_ITEM, SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM, TYPE_HOLDER, PARAM_ITEM, TRIGGER_FIELD_ITEM, DECIMAL_ITEM, XPATH_NODESET, XPATH_NODESET_CMP, VIEW_FIXER_ITEM } |
| enum | cond_result { COND_UNDEF, COND_OK, COND_TRUE, COND_FALSE } |
| enum | traverse_order { POSTFIX, PREFIX } |
| Static Public Member Functions inherited from Item | |
| static void * | operator new (size_t size) throw () |
| static void * | operator new (size_t size, MEM_ROOT *mem_root) throw () |
| static void | operator delete (void *ptr, size_t size) |
| static void | operator delete (void *ptr, MEM_ROOT *mem_root) |
| static const CHARSET_INFO * | default_charset () |
| Protected Member Functions inherited from Item | |
| String * | val_string_from_real (String *str) |
| String * | val_string_from_int (String *str) |
| String * | val_string_from_decimal (String *str) |
| String * | val_string_from_date (String *str) |
| String * | val_string_from_datetime (String *str) |
| String * | val_string_from_time (String *str) |
| my_decimal * | val_decimal_from_real (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_int (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_string (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_date (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_time (my_decimal *decimal_value) |
| longlong | val_int_from_decimal () |
| longlong | val_int_from_date () |
| longlong | val_int_from_time () |
| longlong | val_int_from_datetime () |
| double | val_real_from_decimal () |
| bool | get_date_from_string (MYSQL_TIME *ltime, uint flags) |
| bool | get_date_from_real (MYSQL_TIME *ltime, uint flags) |
| bool | get_date_from_decimal (MYSQL_TIME *ltime, uint flags) |
| bool | get_date_from_int (MYSQL_TIME *ltime, uint flags) |
| bool | get_date_from_time (MYSQL_TIME *ltime) |
| bool | get_date_from_numeric (MYSQL_TIME *ltime, uint fuzzydate) |
| bool | get_date_from_non_temporal (MYSQL_TIME *ltime, uint fuzzydate) |
| bool | get_time_from_string (MYSQL_TIME *ltime) |
| bool | get_time_from_real (MYSQL_TIME *ltime) |
| bool | get_time_from_decimal (MYSQL_TIME *ltime) |
| bool | get_time_from_int (MYSQL_TIME *ltime) |
| bool | get_time_from_date (MYSQL_TIME *ltime) |
| bool | get_time_from_datetime (MYSQL_TIME *ltime) |
| bool | get_time_from_numeric (MYSQL_TIME *ltime) |
| bool | get_time_from_non_temporal (MYSQL_TIME *ltime) |
| Protected Attributes inherited from Item | |
| my_bool | with_subselect |
| my_bool | with_stored_program |
| bool | tables_locked_cache |
An item representing NULL values for use with ROLLUP.
When grouping WITH ROLLUP, Item_null_result items are created to represent NULL values in the grouping columns of the ROLLUP rows. To avoid type problems during execution, these objects are created with the same field and result types as the fields of the columns they belong to.
1.8.1.2 
