Inheritance diagram for Item_sum_avg:

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 Attributes
ulonglong	count
uint	prec_increment
uint	f_precision
uint	f_scale
uint	dec_bin_size

Member Function Documentation

void Item_sum_avg::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_sum.

void Item_sum_avg::update_field ( ) [virtual]

calc next value and merge it with field_value.

Reimplemented from Item_sum_sum.

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

Public Member Functions

Public Attributes

Member Function Documentation