Public Member Functions
void	init (JOIN_TAB *s, table_map remaining_tables, bool in_dups_producing_range, bool is_sjm_nest)
void	next_ref_key ()
void	add_keyuse (table_map remaining_tables, Key_use *keyuse)
bool	have_a_case ()
void	check_ref_access_part1 (JOIN_TAB s, uint key, Key_use start_key, key_part_map bound_keyparts)
void	check_ref_access_part2 (uint key, Key_use *start_key, double records, double read_time)
void	check_range_access (JOIN join, uint idx, QUICK_SELECT_I quick)
void	save_to_position (JOIN_TAB tab, POSITION pos)

Member Function Documentation

void Loose_scan_opt::check_ref_access_part1	(	JOIN_TAB *	s,
		uint	key,
		Key_use *	start_key,
		key_part_map	bound_keyparts
	)		`[inline]`

Check if an index can be used for LooseScan, part 1

Parameters:

s	The join_tab we are checking
key	The key being checked for the associated table
start_key	First applicable keyuse for this key.
bound_keyparts	The key columns determined for this index, ie. found in earlier tables in plan.

void Loose_scan_opt::check_ref_access_part2	(	uint	key,
		Key_use *	start_key,
		double	records,
		double	read_time
	)		`[inline]`

Check if ref access can be used for LooseScan, part 2

Record this LooseScan index if it is cheaper than the currently cheapest LooseScan index.

Note:: Actually ref access is not used by LooseScan: JOIN::set_access_methods() always sets up a index/range scan.

Parameters:

key	The key being checked for the associated table
start_key	First applicable keyuse for this key.
records	Row count estimate for this index access
read_time	Cost of access using this index

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

Public Member Functions