#include <sql_executor.h>

Inheritance diagram for QEP_operation:

Collaboration diagram for QEP_operation:

Public Types
enum	enum_op_type { OT_CACHE, OT_TMP_TABLE }

Public Member Functions
	QEP_operation (JOIN_TAB *tab)
virtual enum_op_type	type ()=0
virtual int	init ()
virtual enum_nested_loop_state	put_record ()=0
virtual enum_nested_loop_state	end_send ()=0
virtual void	free ()

Public Attributes
JOIN_TAB *	join_tab

Additional Inherited Members
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)

Detailed Description

QEP_operation is an interface class for operations in query execution plan.

Currently following operations are implemented: JOIN_CACHE - caches partial join result and joins with attached table QEP_tmp_table - materializes join result in attached table

An operation's life cycle is as follows: .) it is initialized on the init() call .) accumulates records one by one when put_record() is called. .) finalize record sending when end_send() is called. .) free all internal buffers on the free() call.

Each operation is attached to a join_tab, to which exactly depends on the operation type: JOIN_CACHE is attached to the table following the table being cached, QEP_tmp_buffer is attached to a tmp table.

Definition at line 176 of file sql_executor.h.