最简单的两表（称为左表、右表）join算子 更多...
#include <join_physical_operator.h>
类 NestedLoopJoinPhysicalOperator 继承关系图:
Public 成员函数 | |
| PhysicalOperatorType | type () const override |
| RC | open (Trx *trx) override |
| RC | next () override |
| RC | close () override |
| Tuple * | current_tuple () override |
 Public 成员函数 继承自 PhysicalOperator | |
| virtual std::string | name () const |
| virtual std::string | param () const |
| virtual PhysicalOperatorType | type () const =0 |
| virtual RC | open (Trx *trx)=0 |
| virtual RC | next ()=0 |
| virtual RC | close ()=0 |
| virtual Tuple * | current_tuple ()=0 |
| void | add_child (std::unique_ptr< PhysicalOperator > oper) |
| std::vector< std::unique_ptr< PhysicalOperator > > & | children () |
Private 成员函数 | |
| RC | left_next () |
| RC | right_next () |
| 左表遍历下一条数据 | |
Private 属性 | |
| Trx * | trx_ = nullptr |
| 右表遍历下一条数据，如果上一轮结束了就重新开始新的一轮 | |
| PhysicalOperator * | left_ = nullptr |
| 左表右表的真实对象是在PhysicalOperator::children_中，这里是为了写的时候更简单 | |
| PhysicalOperator * | right_ = nullptr |
| Tuple * | left_tuple_ = nullptr |
| Tuple * | right_tuple_ = nullptr |
| JoinedTuple | joined_tuple_ |
| bool | round_done_ = true |
| 当前关联的左右两个tuple | |
| bool | right_closed_ = true |
| 右表遍历的一轮是否结束 | |
额外继承的成员函数 | |
| Protected 属性 继承自 PhysicalOperator | |
| std::vector< std::unique_ptr< PhysicalOperator > > | children_ |
详细描述
最简单的两表（称为左表、右表）join算子
依次遍历左表的每一行，然后关联右表的每一行
成员函数说明
◆ close()
|
overridevirtual |
实现了 PhysicalOperator.
◆ current_tuple()
|
overridevirtual |
实现了 PhysicalOperator.
◆ next()
|
overridevirtual |
实现了 PhysicalOperator.
◆ open()
|
overridevirtual |
实现了 PhysicalOperator.
◆ type()
|
inlineoverridevirtual |
实现了 PhysicalOperator.
该类的文档由以下文件生成:
- src/observer/sql/operator/join_physical_operator.h
- src/observer/sql/operator/join_physical_operator.cpp
