MySQL 8.4.3
Source Code Documentation
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Structure used for index-based lookups. More...
#include <sql_opt_exec_shared.h>
Public Member Functions | |
Index_lookup () | |
bool | impossible_null_ref () const |
bool | has_guarded_conds () const |
Check if there are triggered/guarded conditions that might be 'switched off' by the subquery code when executing 'Full scan on NULL key' subqueries. More... | |
Public Attributes | |
bool | key_err |
uint | key_parts |
num of ... More... | |
uint | key_length |
length of key_buff More... | |
int | key |
key no More... | |
uchar * | key_buff |
value to look for with key More... | |
uchar * | key_buff2 |
key_buff+key_length More... | |
store_key ** | key_copy |
Used to store the value from each keypart field. More... | |
Item ** | items |
val()'s for each keypart More... | |
bool ** | cond_guards |
key_part_map | null_rejecting |
table_map | depend_map |
Table depends on these tables. More... | |
uchar * | null_ref_key |
ha_rows | use_count |
bool | disable_cache |
ulonglong * | keypart_hash = nullptr |
Structure used for index-based lookups.
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inline |
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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.
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inline |
bool** Index_lookup::cond_guards |
table_map Index_lookup::depend_map |
Table depends on these tables.
bool Index_lookup::disable_cache |
Item** Index_lookup::items |
val()'s for each keypart
int Index_lookup::key |
key no
uchar* Index_lookup::key_buff |
value to look for with key
uchar* Index_lookup::key_buff2 |
key_buff+key_length
store_key** Index_lookup::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
bool Index_lookup::key_err |
uint Index_lookup::key_length |
length of key_buff
uint Index_lookup::key_parts |
num of ...
uchar* Index_lookup::null_ref_key |
key_part_map Index_lookup::null_rejecting |
means the condition is '=' and no matching rows will be produced if items[i] IS NULL (see add_not_null_conds())
ha_rows Index_lookup::use_count |