Plan_change_watchdog Class Reference

List of all members.

Public Member Functions
	Plan_change_watchdog (const JOIN_TAB *tab_arg, const bool no_changes_arg)

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Detailed Description

It is not obvious to see that test_if_skip_sort_order() never changes the plan if no_changes is true. So we double-check: creating an instance of this class saves some important access-path-related information of the current table; when the instance is destroyed, the latest access-path information is compared with saved data.

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Constructor & Destructor Documentation

Plan_change_watchdog::Plan_change_watchdog	(	const JOIN_TAB *	tab_arg,
		const bool	no_changes_arg
	)		[inline]

Parameters:

tab_arg	table whose access path is being determined
no_changes	whether a change to the access path is allowed

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

• sql_select.cc