Inheritance diagram for Item_singlerow_subselect:

Public Member Functions
	Item_singlerow_subselect (st_select_lex *select_lex)
virtual void	cleanup ()
subs_type	substype ()
virtual void	reset ()
trans_res	select_transformer (JOIN *join)
void	store (uint i, Item *item)
double	val_real ()
longlong	val_int ()
String *	val_str (String *)
my_decimal *	val_decimal (my_decimal *)
bool	get_date (MYSQL_TIME *ltime, uint fuzzydate)
bool	get_time (MYSQL_TIME *ltime)
bool	val_bool ()
enum Item_result	result_type () const
enum_field_types	field_type () const
void	fix_length_and_dec ()
virtual void	no_rows_in_result ()
uint	cols ()
Item *	element_index (uint i)
Item **	addr (uint i)
bool	check_cols (uint c)
bool	null_inside ()
void	bring_value ()
st_select_lex *	invalidate_and_restore_select_lex ()
Protected Attributes
Item_cache *	value
Item_cache **	row
bool	no_rows
	`no_rows_in_result`
Friends
class	select_singlerow_subselect

Member Function Documentation

st_select_lex * Item_singlerow_subselect::invalidate_and_restore_select_lex ( )

This method is used to implement a special case of semantic tree rewriting, mandated by a SQL:2003 exception in the specification. The only caller of this method is handle_sql2003_note184_exception(), see the code there for more details. Note that this method breaks the object internal integrity, by removing it's association with the corresponding SELECT_LEX, making this object orphan from the parse tree. No other method, beside the destructor, should be called on this object, as it is now invalid.

Returns:: the SELECT_LEX structure that was given in the constructor.

Item_subselect::trans_res Item_singlerow_subselect::select_transformer ( JOIN * join ) [virtual]

Todo:

We cant change name of Item_field or Item_ref, because it will prevent it's correct resolving, but we should save name of removed item => we do not make optimization if top item of list is field or reference.
switch off this optimization for prepare statement, because we do not rollback this changes. Make rollback for it, or special name resolving mode in 5.0.

Reimplemented from Item_subselect.

bool Item_singlerow_subselect::val_bool ( ) [virtual]

Todo:: Make this functions class dependent

Reimplemented from Item.

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

Public Member Functions

Protected Attributes

Friends

Member Function Documentation