org.apache.calcite.rex

Class RexCorrelVariable

java.lang.Object

org.apache.calcite.rex.RexNode

org.apache.calcite.rex.RexVariable

org.apache.calcite.rex.RexCorrelVariable

public class RexCorrelVariable
extends RexVariable

Reference to the current row of a correlating relational expression.

Correlating variables are introduced when performing nested loop joins. Each row is received from one side of the join, a correlating variable is assigned a value, and the other side of the join is restarted.

Field Summary

Fields

Modifier and Type	Field and Description
CorrelationId	id

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
RexCorrelVariable(CorrelationId id, RelDataType type)

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.
SqlKind	getKind() Returns the kind of node this is.

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

getName, getType

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

isA, isA, isAlwaysFalse, isAlwaysTrue, toString

Methods inherited from class java.lang.Object

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

Field Detail

id

public final CorrelationId id

Constructor Detail

RexCorrelVariable

RexCorrelVariable(CorrelationId id,
                  RelDataType type)

Method Detail

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

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