MySQL 8.4.3
Source Code Documentation
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#include <assert.h>
#include <stddef.h>
#include <sys/types.h>
#include "lex_string.h"
#include "my_compiler.h"
#include "my_inttypes.h"
#include "mysql/strings/m_ctype.h"
#include "sql/enum_query_type.h"
#include "sql/mem_root_array.h"
#include "sql/sql_bitmap.h"
#include "sql/sql_show.h"
#include "sql_string.h"
#include "string_with_len.h"
Go to the source code of this file.
Classes | |
struct | st_opt_hint_info |
class | Opt_hints_map |
Opt_hints_map contains information about hint state(specified or not, hint value). More... | |
class | Opt_hints |
Opt_hints class is used as ancestor for Opt_hints_global, Opt_hints_qb, Opt_hints_table, Opt_hints_key classes. More... | |
class | Opt_hints_global |
Global level hints. More... | |
class | Opt_hints_qb |
Query block level hints. More... | |
class | Compound_key_hint |
Auxiliary class for compound key objects. More... | |
class | Index_key_hint |
Auxiliary class for JOIN_INDEX, GROUP_INDEX, ORDER_INDEX hints. More... | |
class | Glob_index_key_hint |
Auxiliary class for INDEX hint. More... | |
class | Opt_hints_table |
Table level hints. More... | |
class | Opt_hints_key |
Key level hints. More... | |
class | Hint_set_var |
Container for set_var object and original variable value. More... | |
class | Sys_var_hint |
SET_VAR hints. More... | |
Enumerations | |
enum | opt_hints_enum { BKA_HINT_ENUM = 0 , BNL_HINT_ENUM , ICP_HINT_ENUM , MRR_HINT_ENUM , NO_RANGE_HINT_ENUM , MAX_EXEC_TIME_HINT_ENUM , QB_NAME_HINT_ENUM , SEMIJOIN_HINT_ENUM , SUBQUERY_HINT_ENUM , DERIVED_MERGE_HINT_ENUM , JOIN_PREFIX_HINT_ENUM , JOIN_SUFFIX_HINT_ENUM , JOIN_ORDER_HINT_ENUM , JOIN_FIXED_ORDER_HINT_ENUM , INDEX_MERGE_HINT_ENUM , RESOURCE_GROUP_HINT_ENUM , SKIP_SCAN_HINT_ENUM , HASH_JOIN_HINT_ENUM , INDEX_HINT_ENUM , JOIN_INDEX_HINT_ENUM , GROUP_INDEX_HINT_ENUM , ORDER_INDEX_HINT_ENUM , DERIVED_CONDITION_PUSHDOWN_HINT_ENUM , MAX_HINT_ENUM } |
Hint types, MAX_HINT_ENUM should be always last. More... | |
Functions | |
bool | is_compound_hint (opt_hints_enum type_arg) |
bool | hint_key_state (const THD *thd, const Table_ref *table, uint keyno, opt_hints_enum type_arg, uint optimizer_switch) |
Returns key hint value if hint is specified, returns optimizer switch value if hint is not specified. More... | |
bool | hint_table_state (const THD *thd, const Table_ref *table, opt_hints_enum type_arg, uint optimizer_switch) |
Returns table hint value if hint is specified, returns optimizer switch value if hint is not specified. More... | |
void | append_table_name (const THD *thd, String *str, const LEX_CSTRING *qb_name, const LEX_CSTRING *table_name) |
Append table and query block name. More... | |
bool | compound_hint_key_enabled (const TABLE *table, uint keyno, opt_hints_enum type_arg) |
Returns true if compound hint state is on with or without specified keys, otherwise returns false. More... | |
bool | idx_merge_hint_state (THD *thd, const TABLE *table, bool *use_cheapest_index_merge) |
Returns true if index merge hint state is on otherwise returns false. More... | |
int | cmp_lex_string (const LEX_CSTRING &s, const LEX_CSTRING &t, const CHARSET_INFO *cs) |
enum opt_hints_enum |
Hint types, MAX_HINT_ENUM should be always last.
This enum should be synchronized with opt_hint_info array(see opt_hints.cc).
void append_table_name | ( | const THD * | thd, |
String * | str, | ||
const LEX_CSTRING * | qb_name, | ||
const LEX_CSTRING * | table_name | ||
) |
Append table and query block name.
thd | pointer to THD object |
str | pointer to String object |
qb_name | pointer to query block name, may be null |
table_name | pointer to table name |
int cmp_lex_string | ( | const LEX_CSTRING & | s, |
const LEX_CSTRING & | t, | ||
const CHARSET_INFO * | cs | ||
) |
bool compound_hint_key_enabled | ( | const TABLE * | table, |
uint | keyno, | ||
opt_hints_enum | type_arg | ||
) |
Returns true if compound hint state is on with or without specified keys, otherwise returns false.
If compound hint state is on and hint is specified without indexes, function returns 'true' for any 'keyno' argument. If hint specified with indexes, function returns true only for appropriate 'keyno' index.
table | Pointer to TABLE object |
keyno | Key number |
type_arg | Hint type |
bool hint_key_state | ( | const THD * | thd, |
const Table_ref * | table, | ||
uint | keyno, | ||
opt_hints_enum | type_arg, | ||
uint | optimizer_switch | ||
) |
Returns key hint value if hint is specified, returns optimizer switch value if hint is not specified.
thd | Pointer to THD object |
table | Pointer to Table_ref object |
keyno | Key number |
type_arg | Hint type |
optimizer_switch | Optimizer switch flag |
bool hint_table_state | ( | const THD * | thd, |
const Table_ref * | table, | ||
opt_hints_enum | type_arg, | ||
uint | optimizer_switch | ||
) |
Returns table hint value if hint is specified, returns optimizer switch value if hint is not specified.
thd | Pointer to THD object |
table | Pointer to Table_ref object |
type_arg | Hint type |
optimizer_switch | Optimizer switch flag |
Returns true if index merge hint state is on otherwise returns false.
thd | Thread handler |
table | Pointer to TABLE object |
use_cheapest_index_merge | IN/OUT Returns true if INDEX_MERGE hint is used without any specified key. |
bool is_compound_hint | ( | opt_hints_enum | type_arg | ) |