org.apache.calcite.rel.rules

Class JoinCommuteRule.VariableReplacer

java.lang.Object

org.apache.calcite.rel.rules.JoinCommuteRule.VariableReplacer

Enclosing class:

JoinCommuteRule

private static class JoinCommuteRule.VariableReplacer
extends Object

Walks over an expression, replacing references to fields of the left and right inputs.

If the field index is less than leftFieldCount, it must be from the left, and so has rightFieldCount added to it; if the field index is greater than leftFieldCount, it must be from the right, so we subtract leftFieldCount from it.

Field Summary

Fields

Modifier and Type	Field and Description
private List<RelDataTypeField>	leftFields
private RexBuilder	rexBuilder
private List<RelDataTypeField>	rightFields

Constructor Summary

Constructors

Constructor and Description
VariableReplacer(RexBuilder rexBuilder, RelDataType leftType, RelDataType rightType)

Method Summary

Modifier and Type	Method and Description
RexNode	go(RexNode rex)

Methods inherited from class java.lang.Object

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

Field Detail

rexBuilder

private final RexBuilder rexBuilder

leftFields

private final List<RelDataTypeField> leftFields

rightFields

private final List<RelDataTypeField> rightFields

Constructor Detail

VariableReplacer

VariableReplacer(RexBuilder rexBuilder,
                 RelDataType leftType,
                 RelDataType rightType)

Method Detail

go

public RexNode go(RexNode rex)