opt_costconstantcache.cc File Reference

#include "sql/opt_costconstantcache.h"
#include <memory>
#include "m_string.h"
#include "my_dbug.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/my_loglevel.h"
#include "mysql/strings/m_ctype.h"
#include "mysqld_error.h"
#include "sql/current_thd.h"
#include "sql/field.h"
#include "sql/iterators/row_iterator.h"
#include "sql/mysqld.h"
#include "sql/opt_costmodel.h"
#include "sql/sql_base.h"
#include "sql/sql_class.h"
#include "sql/sql_const.h"
#include "sql/sql_executor.h"
#include "sql/sql_lex.h"
#include "sql/sql_tmp_table.h"
#include "sql/table.h"
#include "sql/transaction.h"
#include "sql_string.h"
#include "template_utils.h"
#include "thr_lock.h"
#include "thr_mutex.h"

Functions
static void	read_cost_constants (Cost_model_constants *cost_constants)
	Read the cost configuration tables and update the cost constant set. More...
static void	report_server_cost_warnings (const LEX_CSTRING &cost_name, double value, cost_constant_error error)
	Write warnings about illegal entries in the server_cost table. More...
static void	report_engine_cost_warnings (const LEX_CSTRING &se_name, int storage_category, const LEX_CSTRING &cost_name, double value, cost_constant_error error)
	Write warnings about illegal entries in the engine_cost table. More...
static void	read_server_cost_constants (THD *thd, TABLE *table, Cost_model_constants *cost_constants)
	Read the table that contains the cost constants for the server. More...
static void	read_engine_cost_constants (THD *thd, TABLE *table, Cost_model_constants *cost_constants)
	Read the table that contains the cost constants for the storage engines. More...
void	init_optimizer_cost_module (bool enable_plugins)
	Initializes the optimizer cost module. More...
void	delete_optimizer_cost_module ()
	Deletes the optimizer cost module. More...
void	reload_optimizer_cost_constants ()
	Reloads the optimizer cost constants from the cost constant tables. More...

Variables
Cost_constant_cache *	cost_constant_cache = nullptr

Function Documentation

delete_optimizer_cost_module()

void delete_optimizer_cost_module

(

)

Deletes the optimizer cost module.

This should be called when the server stops to release allocated resources.

init_optimizer_cost_module()

void init_optimizer_cost_module

(

bool

enable_plugins

)

Initializes the optimizer cost module.

This should be done during startup from mysqld.cc.

read_cost_constants()

static void read_cost_constants ( Cost_model_constants *  cost_constants )

static

Read the cost configuration tables and update the cost constant set.

The const constant set must be initialized with default values when calling this function.

Parameters

cost_constants

set with cost constants

read_engine_cost_constants()

static void read_engine_cost_constants ( THD *  thd, TABLE *  table, Cost_model_constants *  cost_constants  )

static

Read the table that contains the cost constants for the storage engines.

The table must already be opened. The cost constant object is updated with cost constants found in the configuration table.

Parameters

	thd	the THD
	table	the table to read from
[in,out]	cost_constants	cost constant object

read_server_cost_constants()

static void read_server_cost_constants ( THD *  thd, TABLE *  table, Cost_model_constants *  cost_constants  )

static

Read the table that contains the cost constants for the server.

The table must already be opened. The cost constant object is updated with cost constants found in the configuration table.

Parameters

	thd	the THD
	table	the table to read from
[in,out]	cost_constants	cost constant object

reload_optimizer_cost_constants()

void reload_optimizer_cost_constants

(

)

Reloads the optimizer cost constants from the cost constant tables.

Note

In order to read the cost constant tables, a THD is needed. This function will create a new temporary THD that will be used for this. In case the caller already has a THD this will not be used.

report_engine_cost_warnings()

static void report_engine_cost_warnings ( const LEX_CSTRING &  se_name, int  storage_category, const LEX_CSTRING &  cost_name, double  value, cost_constant_error  error  )

static

Write warnings about illegal entries in the engine_cost table.

The warnings are written to the MySQL error log.

Parameters

se_name	name of storage engine
storage_category	device type
cost_name	name of the cost constant
value	value it was attempted set to
error	error status

report_server_cost_warnings()

static void report_server_cost_warnings ( const LEX_CSTRING &  cost_name, double  value, cost_constant_error  error  )

static

Write warnings about illegal entries in the server_cost table.

The warnings are written to the MySQL error log.

Parameters

cost_name	name of the cost constant
value	value it was attempted set to
error	error status

Variable Documentation

cost_constant_cache

Cost_constant_cache* cost_constant_cache = nullptr