st_table_ref Struct Reference

Inheritance diagram for st_table_ref:

List of all members.

Public Member Functions
bool	impossible_null_ref () const
bool	has_guarded_conds () const
Public Attributes
bool	key_err
bool	has_record
uint	key_parts
	num of ...
uint	key_length
	length of key_buff
int	key
	key no
uchar *	key_buff
	value to look for with key
uchar *	key_buff2
	key_buff+key_length
store_key **	key_copy
Item **	items
	val()'s for each keypart
bool **	cond_guards
key_part_map	null_rejecting
table_map	depend_map
	Table depends on these tables.
uchar *	null_ref_key
ha_rows	use_count
bool	disable_cache

---

Member Function Documentation

bool st_table_ref::has_guarded_conds

(

)

const [inline]

Check if there are triggered/guarded conditions that might be 'switched off' by the subquery code when executing 'Full scan on NULL key' subqueries.

Returns:

true if there are guarded conditions, false otherwise

bool st_table_ref::impossible_null_ref

(

)

const [inline]

Returns:

whether the reference contains NULL values which could never give a match.

---

Member Data Documentation

bool st_table_ref::has_record

True if something was read into buffer in join_read_key.

store_key** st_table_ref::key_copy

Used to store the value from each keypart field. These values are used for ref access. If key_copy[key_part] == NULL it means that the value is constant and does not need to be reevaluated

key_part_map st_table_ref::null_rejecting

(null_rejecting & (1<<i)) means the condition is '=' and no matching rows will be produced if items[i] IS NULL (see add_not_null_conds())

---

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

• sql_select.h