Class for accumulating join result in a tmp table, grouping them if necessary, and sending further. More...

#include <sql_executor.h>

Inheritance diagram for QEP_tmp_table:

Collaboration diagram for QEP_tmp_table:

Public Member Functions
	QEP_tmp_table (JOIN_TAB *tab)
enum_op_type	type ()
enum_nested_loop_state	put_record ()
enum_nested_loop_state	end_send ()
	Finish rnd/index scan after accumulating records, switch ref_array, and send accumulated records further.
void	set_write_func (Next_select_func new_write_func)
Public Member Functions inherited from QEP_operation
	QEP_operation (JOIN_TAB *tab)
virtual int	init ()
virtual void	free ()

Additional Inherited Members
Public Types inherited from QEP_operation
enum	enum_op_type { OT_CACHE, OT_TMP_TABLE }
Static Public Member Functions inherited from Sql_alloc
static void *	operator new (size_t size) throw ()
static void *	operator new[] (size_t size) throw ()
static void *	operator new[] (size_t size, MEM_ROOT *mem_root) throw ()
static void *	operator new (size_t size, MEM_ROOT *mem_root) throw ()
static void	operator delete (void *ptr, size_t size)
static void	operator delete (void ptr, MEM_ROOT mem_root)
static void	operator delete[] (void ptr, MEM_ROOT mem_root)
static void	operator delete[] (void *ptr, size_t size)
Public Attributes inherited from QEP_operation
JOIN_TAB *	join_tab

Detailed Description

Class for accumulating join result in a tmp table, grouping them if necessary, and sending further.

Join result records are accumulated on the put_record() call. The accumulation process is determined by the write_func, it could be: end_write Simply store all records in tmp table. end_write_group Perform grouping using join->group_fields, records are expected to be sorted. end_update Perform grouping using the key generated on tmp table. Input records aren't expected to be sorted. Tmp table uses the heap engine end_update_unique Same as above, but the engine is myisam.

Lazy table initialization is used - the table will be instantiated and rnd/index scan started on the first put_record() call.

Definition at line 234 of file sql_executor.h.