Type for signature generation and for retrieving nrows estimate from secondary engine for current AccessPath. More...

#include <handler.h>

Public Member Functions
	SecondaryEngineNrowsParameters (THD thd, AccessPath access_path, const JoinHypergraph *graph)

	SecondaryEngineNrowsParameters (THD *thd)

Public Attributes
THD *	thd
	The thread context. More...

AccessPath *	access_path
	The AccessPath to retrieve Nrows for. More...

const JoinHypergraph *	graph
	Hypergraph for current query block. More...

OverflowBitset	applied_predicates {}
	Predicates actually applied for AccessPath::REF and other parameterized types. More...

bool	to_update_rows {true}
	if ap->nrows should be acually updated. More...

bool	to_force_resign {false}
	if ap->signature generation should be forced. More...

size_t *	extra_sig {nullptr}
	if nonnull, an additional signature should be combined with current AP. More...

Detailed Description

Type for signature generation and for retrieving nrows estimate from secondary engine for current AccessPath.

Constructor & Destructor Documentation

◆ SecondaryEngineNrowsParameters() [1/2]

SecondaryEngineNrowsParameters::SecondaryEngineNrowsParameters	(	THD *	thd,
		AccessPath *	access_path,
		const JoinHypergraph *	graph
	)

inline

◆ SecondaryEngineNrowsParameters() [2/2]

SecondaryEngineNrowsParameters::SecondaryEngineNrowsParameters ( THD * thd )

inlineexplicit

Member Data Documentation

◆ access_path

AccessPath* SecondaryEngineNrowsParameters::access_path

The AccessPath to retrieve Nrows for.

◆ applied_predicates

OverflowBitset SecondaryEngineNrowsParameters::applied_predicates {}

Predicates actually applied for AccessPath::REF and other parameterized types.

◆ extra_sig

size_t* SecondaryEngineNrowsParameters::extra_sig {nullptr}

if nonnull, an additional signature should be combined with current AP.

◆ graph

const JoinHypergraph* SecondaryEngineNrowsParameters::graph

Hypergraph for current query block.

◆ thd

THD* SecondaryEngineNrowsParameters::thd

The thread context.

◆ to_force_resign

bool SecondaryEngineNrowsParameters::to_force_resign {false}

if ap->signature generation should be forced.

Default behavior is to generate if ap->signature != 0.

◆ to_update_rows

bool SecondaryEngineNrowsParameters::to_update_rows {true}

if ap->nrows should be acually updated.

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

sql/handler.h

Public Member Functions

Public Attributes