Package org.apache.calcite.rel.rules

Class LoptMultiJoin.RemovableSelfJoin

java.lang.Object

org.apache.calcite.rel.rules.LoptMultiJoin.RemovableSelfJoin

Enclosing class:

LoptMultiJoin

private class LoptMultiJoin.RemovableSelfJoin
extends java.lang.Object

Utility class used to keep track of the factors in a removable self-join. The right factor in the self-join is the one that will be removed.

Field Summary

Fields

Modifier and Type	Field	Description
private java.util.Map<java.lang.Integer,java.lang.Integer>	columnMapping	A mapping that maps references to columns from the right factor to columns in the left factor, if the column is referenced in both factors
private int	leftFactor	The left factor in a removable self-join
private int	rightFactor	The right factor in a removable self-join, namely the factor that will be removed

Constructor Summary

Constructors

Constructor	Description
RemovableSelfJoin(int leftFactor, int rightFactor, java.util.Map<java.lang.Integer,java.lang.Integer> columnMapping)

Method Summary

Modifier and Type	Method	Description
java.util.Map<java.lang.Integer,java.lang.Integer>	getColumnMapping()
int	getLeftFactor()
int	getRightFactor()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

leftFactor

private int leftFactor

The left factor in a removable self-join

rightFactor

private int rightFactor

The right factor in a removable self-join, namely the factor that will be removed

columnMapping

private java.util.Map<java.lang.Integer,java.lang.Integer> columnMapping

A mapping that maps references to columns from the right factor to columns in the left factor, if the column is referenced in both factors

Constructor Detail

RemovableSelfJoin

RemovableSelfJoin(int leftFactor,
                  int rightFactor,
                  java.util.Map<java.lang.Integer,java.lang.Integer> columnMapping)

Method Detail

getLeftFactor

public int getLeftFactor()

getRightFactor

public int getRightFactor()

getColumnMapping

public java.util.Map<java.lang.Integer,java.lang.Integer> getColumnMapping()