A specification that two specific relational expressions (e.g., two tables, or a table and a join between two other tables) should be joined together. More...

#include <access_path.h>

Public Attributes
RelationalExpression *	expr

double	selectivity

size_t	estimated_bytes_per_row

FunctionalDependencySet	functional_dependencies

Mem_root_array< int >	functional_dependencies_idx

int	ordering_idx_needed_for_semijoin_rewrite = -1

Item **	semijoin_group = nullptr

int	semijoin_group_size = 0

Detailed Description

A specification that two specific relational expressions (e.g., two tables, or a table and a join between two other tables) should be joined together.

The actual join conditions, if any, live inside the “expr” object, as does the join type etc.

Member Data Documentation

◆ estimated_bytes_per_row

size_t JoinPredicate::estimated_bytes_per_row

◆ expr

RelationalExpression* JoinPredicate::expr

◆ functional_dependencies

FunctionalDependencySet JoinPredicate::functional_dependencies

◆ functional_dependencies_idx

Mem_root_array<int> JoinPredicate::functional_dependencies_idx

◆ ordering_idx_needed_for_semijoin_rewrite

int JoinPredicate::ordering_idx_needed_for_semijoin_rewrite = -1

◆ selectivity

double JoinPredicate::selectivity

◆ semijoin_group

Item** JoinPredicate::semijoin_group = nullptr

◆ semijoin_group_size

int JoinPredicate::semijoin_group_size = 0

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

sql/join_optimizer/access_path.h

Public Attributes