Inheritance diagram for subselect_union_engine:

Collaboration diagram for subselect_union_engine:

Public Member Functions
	subselect_union_engine (st_select_lex_unit u, select_result_interceptor result, Item_subselect *item)
virtual void	cleanup ()
virtual bool	prepare ()
virtual void	fix_length_and_dec (Item_cache **row)
virtual bool	exec ()
virtual uint	cols () const
virtual uint8	uncacheable () const
virtual void	exclude ()
virtual table_map	upper_select_const_tables () const
virtual void	print (String *str, enum_query_type query_type)
virtual bool	change_result (Item_subselect si, select_result_interceptor result)
virtual bool	no_tables () const
virtual bool	is_executed () const
virtual enum_engine_type	engine_type () const
Public Member Functions inherited from subselect_engine
	subselect_engine (Item_subselect si, select_result_interceptor res)
void	set_thd_for_result ()
	Sets "thd" for 'result'. Should be called before prepare()
virtual enum Item_result	type () const
virtual enum_field_types	field_type () const
virtual bool	may_be_null () const
const Item_subselect *	get_item () const

Additional Inherited Members
Public Types inherited from subselect_engine
enum	enum_engine_type { ABSTRACT_ENGINE, SINGLE_SELECT_ENGINE, UNION_ENGINE, UNIQUESUBQUERY_ENGINE, INDEXSUBQUERY_ENGINE, HASH_SJ_ENGINE }
Static Public Member Functions inherited from subselect_engine
static table_map	calc_const_tables (TABLE_LIST *)
Protected Member Functions inherited from subselect_engine
void	set_row (List< Item > &item_list, Item_cache **row)
Protected Attributes inherited from subselect_engine
select_result_interceptor *	result
Item_subselect *	item
enum Item_result	res_type
enum_field_types	res_field_type
bool	maybe_null

Detailed Description

Definition at line 619 of file item_subselect.h.

Member Function Documentation

bool subselect_union_engine::change_result	(	Item_subselect *	si,
		select_result_interceptor *	res
	)

virtual

change select_result object of engine.

Parameters

si	new subselect Item
res	new select_result object

Return values

FALSE	OK
TRUE	error

Definition at line 3370 of file item_subselect.cc.

void subselect_union_engine::cleanup ( )

virtual

Cleanup engine after complete query execution, free all resources.

Definition at line 2568 of file item_subselect.cc.

bool subselect_union_engine::no_tables ( ) const

virtual

Report about presence of tables in subquery.

Return values

TRUE	there are not tables used in subquery
FALSE	there are some tables in subquery

Definition at line 3438 of file item_subselect.cc.

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