Memo类 参考

: memorization 更多...

#include <memo.h>

类
struct	GExprPtrEq
struct	GExprPtrHash

Public 成员函数
GroupExpr *	insert_expression (GroupExpr *gexpr)
GroupExpr *	insert_expression (GroupExpr *gexpr, int target_group)
Group *	get_group_by_id (int id) const
void	dump () const
void	record_operator (unique_ptr< OperatorNode > &&node)
void	release_operator (OperatorNode *node)

Private 成员函数
int	add_new_group (GroupExpr *gexpr)

Private 属性
std::unordered_set< GroupExpr *, GExprPtrHash, GExprPtrEq >	group_expressions_
vector< unique_ptr< Group > >	groups_
std::unordered_map< OperatorNode *, unique_ptr< OperatorNode > >	operator_nodes_

详细描述

: memorization

: Memo class for tracking Groups and GroupExpressions and provides the mechanisms by which we can do duplicate group detection. TODO: rename to search space(ssp)? (in columbia)

类成员变量说明

group_expressions_

std::unordered_set<GroupExpr *, GExprPtrHash, GExprPtrEq> Memo::group_expressions_

private

Group owns GroupExpressions, not the memo

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该类的文档由以下文件生成:

• src/observer/sql/optimizer/cascade/memo.h
• src/observer/sql/optimizer/cascade/memo.cpp