org.apache.calcite.rel

Class BiRel

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.BiRel

All Implemented Interfaces:

Cloneable, RelOptNode, RelNode

Direct Known Subclasses:

Correlate, Join

public abstract class BiRel
extends AbstractRelNode

Abstract base class for relational expressions with a two inputs.

It is not required that two-input relational expressions use this class as a base class. However, default implementations of methods make life easier.

Field Summary

Fields

Modifier and Type	Field and Description
protected RelNode	left
protected RelNode	right

Fields inherited from class org.apache.calcite.rel.AbstractRelNode

digest, id, rowType, traitSet

Constructor Summary

Constructors

Constructor and Description
BiRel(RelOptCluster cluster, RelTraitSet traitSet, RelNode left, RelNode right)

Method Summary

Methods

Modifier and Type	Method and Description
void	childrenAccept(RelVisitor visitor) Interacts with the RelVisitor in a visitor pattern to traverse the tree of relational expressions.
RelWriter	explainTerms(RelWriter pw) Describes the inputs and attributes of this relational expression.
List<RelNode>	getInputs() Returns an array of this relational expression's inputs.
RelNode	getLeft()
RelNode	getRight()
void	replaceInput(int ordinalInParent, RelNode p) Replaces the ordinalInParentth input.

Methods inherited from class org.apache.calcite.rel.AbstractRelNode

accept, accept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, copy, deriveRowType, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraitSet, getVariablesStopped, isDistinct, isKey, isValid, metadata, onRegister, recomputeDigest, register, sole, toString

Methods inherited from class java.lang.Object

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

Field Detail

left

protected RelNode left

right

protected RelNode right

Constructor Detail

BiRel

public BiRel(RelOptCluster cluster,
     RelTraitSet traitSet,
     RelNode left,
     RelNode right)

Method Detail

childrenAccept

public void childrenAccept(RelVisitor visitor)

Description copied from interface: RelNode

Interacts with the RelVisitor in a visitor pattern to traverse the tree of relational expressions.

Specified by:

childrenAccept in interface RelNode

Overrides:

childrenAccept in class AbstractRelNode

Parameters:

visitor - Visitor that will traverse the tree of relational expressions

getInputs

public List<RelNode> getInputs()

Description copied from interface: RelNode

Returns an array of this relational expression's inputs. If there are no inputs, returns an empty list, not null.

Specified by:

getInputs in interface RelOptNode

Specified by:

getInputs in interface RelNode

Overrides:

getInputs in class AbstractRelNode

Returns:

Array of this relational expression's inputs

getLeft

public RelNode getLeft()

getRight

public RelNode getRight()

replaceInput

public void replaceInput(int ordinalInParent,
                RelNode p)

Description copied from interface: RelNode

Replaces the ordinalInParent^th input. You must override this method if you override RelNode.getInputs().

Specified by:

replaceInput in interface RelNode

Overrides:

replaceInput in class AbstractRelNode

Parameters:

ordinalInParent - Position of the child input, 0 is the first

p - New node that should be put at position ordinalInParent

explainTerms

public RelWriter explainTerms(RelWriter pw)

Description copied from class: AbstractRelNode

Describes the inputs and attributes of this relational expression. Each node should call super.explainTerms, then call the RelWriterImpl.input(String, RelNode) and RelWriterImpl.item(String, Object) methods for each input and attribute.

Overrides:

explainTerms in class AbstractRelNode

Parameters:

pw - Plan writer

Returns:

Plan writer for fluent-explain pattern