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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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Public Member Functions | |
| Item_sum_avg (Item *item_par, bool distinct) | |
| Item_sum_avg (THD *thd, Item_sum_avg *item) | |
| void | fix_length_and_dec () |
| enum Sumfunctype | sum_func () const |
| void | clear () |
| bool | add () |
| double | val_real () |
| longlong | val_int () |
| my_decimal * | val_decimal (my_decimal *) |
| String * | val_str (String *str) |
| void | reset_field () |
| void | update_field () |
| Item * | result_item (Field *field) |
| void | no_rows_in_result () |
| const char * | func_name () const |
| Item * | copy_or_same (THD *thd) |
| Field * | create_tmp_field (bool group, TABLE *table) |
| void | cleanup () |
 Public Member Functions inherited from Item_sum_sum | |
| Item_sum_sum (Item *item_par, bool distinct) | |
| Item_sum_sum (THD *thd, Item_sum_sum *item) | |
| enum Item_result | result_type () const |
| Public Member Functions inherited from Item_sum_num | |
| Item_sum_num (Item *item_par) | |
| Item_sum_num (Item *a, Item *b) | |
| Item_sum_num (List< Item > &list) | |
| Item_sum_num (THD *thd, Item_sum_num *item) | |
| bool | fix_fields (THD *, Item **) |
| bool | get_date (MYSQL_TIME *ltime, uint fuzzydate) |
| bool | get_time (MYSQL_TIME *ltime) |
| Public Member Functions inherited from Item_sum | |
| bool | has_force_copy_fields () const |
| bool | has_with_distinct () const |
| void | mark_as_sum_func () |
| Item_sum (Item *a) | |
| Item_sum (Item *a, Item *b) | |
| Item_sum (List< Item > &list) | |
| Item_sum (THD *thd, Item_sum *item) | |
| enum Type | type () const |
| bool | reset_and_add () |
| virtual bool | keep_field_type (void) const |
| table_map | used_tables () const |
| void | update_used_tables () |
| bool | is_null () |
| void | make_const () |
| virtual bool | const_item () const |
| virtual bool | const_during_execution () const |
| virtual void | print (String *str, enum_query_type query_type) |
| void | fix_num_length_and_dec () |
| virtual void | make_unique () |
| Item * | get_tmp_table_item (THD *thd) |
| bool | walk (Item_processor processor, bool walk_subquery, uchar *argument) |
| virtual bool | clean_up_after_removal (uchar *arg) |
| bool | init_sum_func_check (THD *thd) |
| bool | check_sum_func (THD *thd, Item **ref) |
| bool | register_sum_func (THD *thd, Item **ref) |
| st_select_lex * | depended_from () |
| Item * | get_arg (uint i) |
| Item * | set_arg (uint i, THD *thd, Item *new_val) |
| uint | get_arg_count () |
| void | init_aggregator () |
| bool | aggregator_setup (THD *thd) |
| void | aggregator_clear () |
| bool | aggregator_add () |
| void | set_distinct (bool distinct) |
| int | set_aggregator (Aggregator::Aggregator_type aggregator) |
| virtual bool | setup (THD *thd) |
| Public Member Functions inherited from Item_result_field | |
| Item_result_field (THD *thd, Item_result_field *item) | |
| Field * | get_tmp_table_field () |
| Field * | tmp_table_field (TABLE *t_arg) |
| void | set_result_field (Field *field) |
| bool | is_result_field () |
| void | save_in_result_field (bool no_conversions) |
| 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 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 type_conversion_status | save_in_field (Field *field, bool no_conversions) |
| virtual void | save_org_in_field (Field *field) |
| virtual type_conversion_status | save_safe_in_field (Field *field) |
| virtual bool | send (Protocol *protocol, String *str) |
| virtual bool | eq (const Item *, bool binary_cmp) const |
| 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_field_types | field_type () const |
| virtual enum_monotonicity_info | get_monotonicity_info () const |
| virtual longlong | val_int_endpoint (bool left_endp, bool *incl_endp) |
| virtual longlong | val_date_temporal () |
| virtual longlong | val_time_temporal () |
| 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 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 bool | basic_const_item () const |
| virtual Item * | clone_item () |
| 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 () |
| 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 | 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 bool | is_bool_func () |
| virtual Item * | copy_andor_structure (THD *thd, bool real_items=false) |
| virtual Item * | real_item () |
| virtual const CHARSET_INFO * | compare_collation () |
| virtual const CHARSET_INFO * | charset_for_protocol (void) const |
| 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 | 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 | check_partition_func_processor (uchar *bool_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) |
| virtual Item * | safe_charset_converter (const CHARSET_INFO *tocs) |
| 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 | |
| ulonglong | count |
| uint | prec_increment |
| uint | f_precision |
| uint | f_scale |
| uint | dec_bin_size |
Additional Inherited Members | |
| Public Types inherited from Item_sum | |
| enum | Sumfunctype { COUNT_FUNC, COUNT_DISTINCT_FUNC, SUM_FUNC, SUM_DISTINCT_FUNC, AVG_FUNC, AVG_DISTINCT_FUNC, MIN_FUNC, MAX_FUNC, STD_FUNC, VARIANCE_FUNC, SUM_BIT_FUNC, UDF_SUM_FUNC, GROUP_CONCAT_FUNC } |
| 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) |
| Static Protected Member Functions inherited from Item_sum | |
| static ulonglong | ram_limitation (THD *thd) |
| Protected Attributes inherited from Item_sum_sum | |
| Item_result | hybrid_type |
| double | sum |
| my_decimal | dec_buffs [2] |
| uint | curr_dec_buff |
Definition at line 853 of file item_sum.h.
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inlinevirtual |
Mark an aggregate as having no rows.
This function is called by the execution engine to assign 'NO ROWS FOUND' value to an aggregate item, when the underlying result set has no rows. Such value, in a general case, may be different from the default value of the item after 'clear()': e.g. a numeric item may be initialized to 0 by clear() and to NULL by no_rows_in_result().
Reimplemented from Item_sum_sum.
Definition at line 882 of file item_sum.h.
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virtual |
calc next value and merge it with field_value.
Reimplemented from Item_sum_sum.
Definition at line 2403 of file item_sum.cc.
1.8.1.2 
