Item_sum_sum Class Reference

Inheritance diagram for Item_sum_sum:

List of all members.

Public Member Functions
	Item_sum_sum (Item *item_par, bool distinct)
	Item_sum_sum (THD *thd, Item_sum_sum *item)
enum Sumfunctype	sum_func () const
void	clear ()
bool	add ()
double	val_real ()
longlong	val_int ()
String *	val_str (String *str)
my_decimal *	val_decimal (my_decimal *)
enum Item_result	result_type () const
void	reset_field ()
void	update_field ()
void	no_rows_in_result ()
const char *	func_name () const
Item *	copy_or_same (THD *thd)
Protected Member Functions
void	fix_length_and_dec ()
Protected Attributes
Item_result	hybrid_type
double	sum
my_decimal	dec_buffs [2]
uint	curr_dec_buff

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Constructor & Destructor Documentation

Item_sum_sum::Item_sum_sum	(	THD *	thd,
		Item_sum_sum *	item
	)

Todo:

check if the following assignments are really needed

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Member Function Documentation

void Item_sum_sum::no_rows_in_result

(

)

[inline, 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.

Reimplemented in Item_sum_avg.

void Item_sum_sum::update_field

(

)

[virtual]

calc next value and merge it with field_value.

Implements Item_sum.

Reimplemented in Item_sum_avg.

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

• item_sum.h
• item_sum.cc