Enable_derived_merge_guard Class Reference

RAII class to temporarily enable derived_merge optimizer_switch for SHOW commands that are based on INFORMATION_SCHEMA system views. More...

#include <thd_raii.h>

Public Member Functions
	Enable_derived_merge_guard (THD *thd, bool enable_derived_merge)
	~Enable_derived_merge_guard ()

Private Attributes
THD *const	m_thd {nullptr}
bool	m_derived_merge {false}
ulonglong	m_save_optimizer_switch {0}

Detailed Description

RAII class to temporarily enable derived_merge optimizer_switch for SHOW commands that are based on INFORMATION_SCHEMA system views.

Constructor & Destructor Documentation

Enable_derived_merge_guard()

Enable_derived_merge_guard::Enable_derived_merge_guard ( THD *  thd, bool  enable_derived_merge  )

inlineexplicit

~Enable_derived_merge_guard()

Enable_derived_merge_guard::~Enable_derived_merge_guard ( )

inline

Member Data Documentation

m_derived_merge

bool Enable_derived_merge_guard::m_derived_merge {false}

private

m_save_optimizer_switch

ulonglong Enable_derived_merge_guard::m_save_optimizer_switch {0}

private

m_thd

THD* const Enable_derived_merge_guard::m_thd {nullptr}

private

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

• sql/thd_raii.h