Inheritance diagram for Item_sum_hybrid:

Public Member Functions
	Item_sum_hybrid (Item *item_par, int sign)
	Item_sum_hybrid (THD thd, Item_sum_hybrid item)
bool	fix_fields (THD , Item *)
void	setup_hybrid (Item item, Item value_arg)
void	clear ()
double	val_real ()
longlong	val_int ()
longlong	val_time_temporal ()
longlong	val_date_temporal ()
my_decimal *	val_decimal (my_decimal *)
bool	get_date (MYSQL_TIME *ltime, uint fuzzydate)
bool	get_time (MYSQL_TIME *ltime)
void	reset_field ()
String *	val_str (String *)
bool	keep_field_type (void) const
enum Item_result	result_type () const
enum enum_field_types	field_type () const
void	update_field ()
void	min_max_update_str_field ()
void	min_max_update_temporal_field ()
void	min_max_update_real_field ()
void	min_max_update_int_field ()
void	min_max_update_decimal_field ()
void	cleanup ()
bool	any_value ()
void	no_rows_in_result ()
Field *	create_tmp_field (bool group, TABLE *table)
Protected Attributes
Item_cache *	value
Item_cache *	arg_cache
Arg_comparator *	cmp
Item_result	hybrid_type
enum_field_types	hybrid_field_type
int	cmp_sign
bool	was_values

Member Function Documentation

void Item_sum_hybrid::min_max_update_decimal_field ( )

Todo:: optimize: do not get result_field in case of args[0] is NULL

void Item_sum_hybrid::no_rows_in_result ( ) [virtual]

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.

void Item_sum_hybrid::setup_hybrid	(	Item *	item,
		Item *	value_arg
	)

MIN/MAX function setup.

Parameters:

item	argument of MIN/MAX function
value_arg	calculated value of MIN/MAX function

Setup cache/comparator of MIN/MAX functions. When called by the copy_or_same function value_arg parameter contains calculated value of the original MIN/MAX object and it is saved in this object's cache.

longlong Item_sum_hybrid::val_date_temporal ( ) [virtual]

Return date value of item in packed longlong format.

Reimplemented from Item.

longlong Item_sum_hybrid::val_time_temporal ( ) [virtual]

Return time value of item in packed longlong format.

Reimplemented from Item.

The documentation for this class was generated from the following files:

Public Member Functions

Protected Attributes

Member Function Documentation