org.apache.calcite.rex

Class RexLocalRef

java.lang.Object

org.apache.calcite.rex.RexNode

org.apache.calcite.rex.RexVariable

org.apache.calcite.rex.RexSlot

org.apache.calcite.rex.RexLocalRef

public class RexLocalRef
extends RexSlot

Local variable.

Identity is based upon type and index. We want multiple references to the same slot in the same context to be equal. A side effect is that references to slots in different contexts which happen to have the same index and type will be considered equal; this is not desired, but not too damaging, because of the immutability.

Variables are immutable.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.rex.RexSlot

RexSlot.SelfPopulatingList

Field Summary

Fields inherited from class org.apache.calcite.rex.RexSlot

index

Fields inherited from class org.apache.calcite.rex.RexVariable

name, type

Fields inherited from class org.apache.calcite.rex.RexNode

digest

Constructor Summary

Constructors

Constructor and Description
RexLocalRef(int index, RelDataType type) Creates a local variable.

Method Summary

Modifier and Type	Method and Description
<R,P> R	accept(RexBiVisitor<R,P> visitor, P arg) Accepts a visitor with a payload, dispatching to the right overloaded RexBiVisitor.visitInputRef(RexInputRef, Object) visitXxx} method.
<R> R	accept(RexVisitor<R> visitor) Accepts a visitor, dispatching to the right overloaded visitXxx method.
boolean	equals(Object obj) Every node must implement RexNode.equals(java.lang.Object) based on its content
SqlKind	getKind() Returns the kind of node this is.
int	hashCode() Every node must implement RexNode.hashCode() consistent with RexNode.equals(java.lang.Object)

Methods inherited from class org.apache.calcite.rex.RexSlot

getIndex

Methods inherited from class org.apache.calcite.rex.RexVariable

getName, getType

Methods inherited from class org.apache.calcite.rex.RexNode

isA, isA, isAlwaysFalse, isAlwaysTrue, nodeCount, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RexLocalRef

public RexLocalRef(int index,
                   RelDataType type)

Creates a local variable.

Parameters:

index - Index of the field in the underlying row type

type - Type of the column

Method Detail

getKind

public SqlKind getKind()

Description copied from class: RexNode

Returns the kind of node this is.

Overrides:

getKind in class RexNode

Returns:

Node kind, never null

equals

public boolean equals(Object obj)

Description copied from class: RexNode

Every node must implement RexNode.equals(java.lang.Object) based on its content

Specified by:

equals in class RexNode

hashCode

public int hashCode()

Description copied from class: RexNode

Every node must implement RexNode.hashCode() consistent with RexNode.equals(java.lang.Object)

Specified by:

hashCode in class RexNode

accept

public <R> R accept(RexVisitor<R> visitor)

Description copied from class: RexNode

Accepts a visitor, dispatching to the right overloaded visitXxx method.

Also see RexUtil.apply(RexVisitor, java.util.List, RexNode), which applies a visitor to several expressions simultaneously.

Specified by:

accept in class RexNode

accept

public <R,P> R accept(RexBiVisitor<R,P> visitor,
                      P arg)

Description copied from class: RexNode

Accepts a visitor with a payload, dispatching to the right overloaded RexBiVisitor.visitInputRef(RexInputRef, Object) visitXxx} method.

Specified by:

accept in class RexNode