Sys_var_hint Class Reference

SET_VAR hints. More...

#include <opt_hints.h>

Public Member Functions
	Sys_var_hint (MEM_ROOT *mem_root_arg)
bool	add_var (THD *thd, const System_variable_tracker &var_tracker, Item *sys_var_value)
	Add variable to hint list. More...
void	update_vars (THD *thd)
	Find variable in hint list. More...
void	restore_vars (THD *thd)
	Restore system variables with original values. More...
void	print (const THD *thd, String *str)
	Print applicable hints. More...

Private Attributes
Mem_root_array< Hint_set_var * >	var_list

Detailed Description

SET_VAR hints.

Constructor & Destructor Documentation

Sys_var_hint()

Sys_var_hint::Sys_var_hint ( MEM_ROOT *  mem_root_arg )

inline

Member Function Documentation

add_var()

bool Sys_var_hint::add_var	(	THD *	thd,
		const System_variable_tracker &	var_tracker,
		Item *	sys_var_value
	)

Add variable to hint list.

Parameters

thd	pointer to THD object
var_tracker	pointer to System_variable_tracker object
sys_var_value	variable value

Returns

true if variable is added, false otherwise

print()

void Sys_var_hint::print	(	const THD *	thd,
		String *	str
	)

Print applicable hints.

Parameters

thd	Thread handle
str	Pointer to string object

restore_vars()

void Sys_var_hint::restore_vars

(

THD *

thd

)

Restore system variables with original values.

Parameters

thd	Pointer to thread object

update_vars()

void Sys_var_hint::update_vars

(

THD *

thd

)

Find variable in hint list.

Parameters

thd	Pointer to thread object

Member Data Documentation

var_list

Mem_root_array<Hint_set_var *> Sys_var_hint::var_list

private

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

• sql/opt_hints.h
• sql/opt_hints.cc