Package org.apache.calcite.rex

Class RexNodeAndFieldIndex

java.lang.Object

org.apache.calcite.rex.RexNode

org.apache.calcite.rex.RexVariable

org.apache.calcite.rex.RexNodeAndFieldIndex

public class RexNodeAndFieldIndex
extends RexVariable

RexNodeAndFieldIndex has the same meaning as RexInputRef, they are both reference a field of an input relational expression. The difference is that, RexNodeAndFieldIndex uses the input index and the relative position of field in input rowType.

For example, if the inputs to a join are

• Input #0: EMP(EMPNO, ENAME, DEPTNO) and
• Input #1: DEPT(DEPTNO AS DEPTNO2, DNAME)

then the fields are:

• Node #0, Field #0: EMPNO
• Node #0, Field #1: ENAME
• Node #0, Field #2: DEPTNO (from EMP)
• Node #1, Field #0: DEPTNO2 (from DEPT)
• Node #1, Field #1: DNAME

If in some cases, the inputs order of a relation is frequently adjusted and it is difficult to maintain the correct RexInputRef, you can consider temporarily replacing RexInputRef with RexNodeAndFieldIndex.

See Also:

• JoinToHyperGraphRule
• HyperGraph.extractJoinCond(java.util.List<org.apache.calcite.rel.rules.HyperGraph.NodeState>, int, java.util.List<org.apache.calcite.rel.rules.HyperEdge>, org.apache.calcite.rel.core.JoinRelType)
• HyperEdge.createHyperEdgesFromJoinConds(java.util.Map<java.lang.Integer, java.lang.Integer>, java.util.Map<java.lang.Integer, java.lang.Integer>, java.util.List<org.apache.calcite.rex.RexNode>, java.util.List<org.apache.calcite.rel.rules.ConflictRule>, org.apache.calcite.rel.core.JoinRelType, int, int)

Field Summary

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	Description
RexNodeAndFieldIndex(int nodeIndex, int fieldIndex, String name, RelDataType type)

Method Summary

Modifier and Type	Method	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(@Nullable Object obj)
int	getFieldIndex()
int	getNodeIndex()
int	hashCode()
String	toString()

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

getName, getType

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

getKind, isA, isA, isAlwaysFalse, isAlwaysTrue, nodeCount

Methods inherited from class java.lang.Object

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

Constructor Details

RexNodeAndFieldIndex

public RexNodeAndFieldIndex(int nodeIndex,
 int fieldIndex,
 String name,
 RelDataType type)

Method Details

getNodeIndex

public int getNodeIndex()

getFieldIndex

public int getFieldIndex()

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

equals

public boolean equals(@Nullable 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

toString

public String toString()

Overrides:

toString in class RexNode