org.apache.calcite.rel.rules

Class AggregateExtractProjectRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<AggregateExtractProjectRule.Config>

org.apache.calcite.rel.rules.AggregateExtractProjectRule

All Implemented Interfaces:

TransformationRule

@Value.Enclosing
public class AggregateExtractProjectRule
extends RelRule<AggregateExtractProjectRule.Config>
implements TransformationRule

Rule to extract a Project from an Aggregate and push it down towards the input.

What projections can be safely pushed down depends upon which fields the Aggregate uses.

To prevent cycles, this rule will not extract a Project if the Aggregates input is already a Project.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	AggregateExtractProjectRule.Config Rule configuration.

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelRule

RelRule.Done, RelRule.MatchHandler<R extends RelOptRule>, RelRule.OperandBuilder, RelRule.OperandDetailBuilder<R extends RelNode>, RelRule.OperandTransform

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields

Modifier and Type	Field and Description
static AggregateExtractProjectRule	SCAN

Fields inherited from class org.apache.calcite.plan.RelRule

config

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AggregateExtractProjectRule(AggregateExtractProjectRule.Config config) Creates an AggregateExtractProjectRule.
	AggregateExtractProjectRule(Class<? extends Aggregate> aggregateClass, Class<? extends RelNode> inputClass, RelBuilderFactory relBuilderFactory) Deprecated.
	AggregateExtractProjectRule(RelOptRuleOperand operand, RelBuilderFactory builderFactory) Deprecated.

Method Summary

Modifier and Type	Method and Description
void	onMatch(RelOptRuleCall call) Receives notification about a rule match.

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

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

Field Detail

SCAN

public static final AggregateExtractProjectRule SCAN

Constructor Detail

AggregateExtractProjectRule

protected AggregateExtractProjectRule(AggregateExtractProjectRule.Config config)

Creates an AggregateExtractProjectRule.

AggregateExtractProjectRule

@Deprecated
public AggregateExtractProjectRule(Class<? extends Aggregate> aggregateClass,
                                               Class<? extends RelNode> inputClass,
                                               RelBuilderFactory relBuilderFactory)

Deprecated.

AggregateExtractProjectRule

@Deprecated
public AggregateExtractProjectRule(RelOptRuleOperand operand,
                                               RelBuilderFactory builderFactory)

Deprecated.

Method Detail

onMatch

public void onMatch(RelOptRuleCall call)

Description copied from class: RelOptRule

Receives notification about a rule match. At the time that this method is called, call.rels holds the set of relational expressions which match the operands to the rule; call.rels[0] is the root expression.

Typically a rule would check that the nodes are valid matches, creates a new expression, then calls back RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>, org.apache.calcite.plan.RelHintsPropagator) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)