project 表示投影运算更多...

#include <project_logical_operator.h>

类 ProjectLogicalOperator 继承关系图:

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

LogicalOperatorType	type () const override

OpType	get_op_type () const override

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

vector< unique_ptr< Expression > > &	expressions ()

const vector< unique_ptr< Expression > > &	expressions () const

Public 成员函数继承自 LogicalOperator
virtual LogicalOperatorType	type () const =0

bool	is_physical () const override

bool	is_logical () const override

void	add_child (unique_ptr< LogicalOperator > oper)

void	add_expressions (unique_ptr< Expression > expr)

auto	children () -> vector< unique_ptr< LogicalOperator > > &

auto	expressions () -> vector< unique_ptr< Expression > > &

void	generate_general_child ()

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 ()

额外继承的成员函数
静态 Public 成员函数继承自 LogicalOperator
static bool	can_generate_vectorized_operator (const LogicalOperatorType &type)

Protected 属性继承自 LogicalOperator
vector< unique_ptr< LogicalOperator > >	children_
	子算子更多...

vector< unique_ptr< Expression > >	expressions_

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

详细描述

project 表示投影运算

从表中获取数据后，可能需要过滤，投影，连接等等。

成员函数说明

◆ find_log_prop()

unique_ptr< LogicalProperty > ProjectLogicalOperator::find_log_prop ( const vector< LogicalProperty * > & log_props )

overridevirtual

Generate the logical property of the operator node using the input logical properties.

参数

log_props Input logical properties of the operator node.

返回: Logical property of the operator node.

重载 OperatorNode .

◆ get_op_type()

OpType ProjectLogicalOperator::get_op_type ( ) const

inlineoverridevirtual

TODO: add this function TODO: unify logical and physical OpType

重载 OperatorNode .

◆ type()

LogicalOperatorType ProjectLogicalOperator::type ( ) const

inlineoverridevirtual

实现了 LogicalOperator.

该类的文档由以下文件生成:

src/observer/sql/operator/project_logical_operator.h
src/observer/sql/operator/project_logical_operator.cpp

Public 成员函数

额外继承的成员函数

详细描述

成员函数说明

◆ find_log_prop()

◆ get_op_type()

◆ type()