选择/投影物理算子更多...

#include <project_physical_operator.h>

类 ProjectPhysicalOperator 继承关系图:

Public 成员函数
	ProjectPhysicalOperator (vector< unique_ptr< Expression > > &&expressions)

PhysicalOperatorType	type () const override

OpType	get_op_type () const override

virtual double	calculate_cost (LogicalProperty prop, const vector< LogicalProperty > &child_log_props, CostModel *cm) override
	Calculates the cost of a logical operation. 更多...

RC	open (Trx *trx) override

RC	next () override

RC	close () override

int	cell_num () const

Tuple *	current_tuple () override

RC	tuple_schema (TupleSchema &schema) const override

Public 成员函数继承自 PhysicalOperator
virtual string	name () const

virtual string	param () const

bool	is_physical () const override

bool	is_logical () const override

virtual PhysicalOperatorType	type () const =0

virtual RC	open (Trx *trx)=0

virtual RC	next ()

virtual RC	next (Chunk &chunk)

virtual RC	close ()=0

virtual Tuple *	current_tuple ()

virtual RC	tuple_schema (TupleSchema &schema) const

void	add_child (unique_ptr< PhysicalOperator > oper)

vector< unique_ptr< PhysicalOperator > > &	children ()

Public 成员函数继承自 OperatorNode
virtual OpType	get_op_type () const

virtual bool	is_physical () const =0

virtual bool	is_logical () const =0

virtual uint64_t	hash () const

virtual bool	operator== (const OperatorNode &other) const

virtual unique_ptr< LogicalProperty >	find_log_prop (const vector< LogicalProperty * > &log_props)
	Generate the logical property of the operator node using the input logical properties. 更多...

virtual double	calculate_cost (LogicalProperty prop, const vector< LogicalProperty > &child_log_props, CostModel *cm)
	Calculates the cost of a logical operation. 更多...

void	add_general_child (OperatorNode *child)

vector< OperatorNode * > &	get_general_children ()

Private 属性
vector< unique_ptr< Expression > >	expressions_

ExpressionTuple< unique_ptr< Expression > >	tuple_

额外继承的成员函数
Protected 属性继承自 PhysicalOperator
vector< unique_ptr< PhysicalOperator > >	children_

Protected 属性继承自 OperatorNode
vector< OperatorNode * >	general_children_

详细描述

选择/投影物理算子

成员函数说明

◆ calculate_cost()

virtual double ProjectPhysicalOperator::calculate_cost	(	LogicalProperty *	prop,
		const vector< LogicalProperty * > &	child_log_props,
		CostModel *	cm
	)

inlineoverridevirtual

Calculates the cost of a logical operation.

This function is intended to be overridden in derived classes. It calculates the cost associated with a specific logical property, taking into account the provided child logical properties and a cost model.

参数

prop	A pointer to the logical property for which the cost is being calculated.
child_log_props	A vector containing pointers to child logical properties.
cm	A pointer to the cost model used for calculating the cost.