org.apache.calcite.rel.rules

Class AggregateJoinRemoveRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.calcite.rel.rules.AggregateJoinRemoveRule

All Implemented Interfaces:

TransformationRule

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

Planner rule that matches an Aggregate on a Join and removes the join provided that the join is a left join or right join and it computes no aggregate functions or all the aggregate calls have distinct.

For instance,

select distinct s.product_id from
 sales as s
 left join product as p
 on s.product_id = p.product_id

becomes

select distinct s.product_id from sales as s

See Also:

CoreRules.AGGREGATE_JOIN_REMOVE

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	AggregateJoinRemoveRule.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 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	AggregateJoinRemoveRule(AggregateJoinRemoveRule.Config config) Creates an AggregateJoinRemoveRule.
	AggregateJoinRemoveRule(Class<? extends Aggregate> aggregateClass, Class<? extends Join> joinClass, RelBuilderFactory relBuilderFactory) 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

Constructor Detail

AggregateJoinRemoveRule

protected AggregateJoinRemoveRule(AggregateJoinRemoveRule.Config config)

Creates an AggregateJoinRemoveRule.

AggregateJoinRemoveRule

@Deprecated
public AggregateJoinRemoveRule(Class<? extends Aggregate> aggregateClass,
                                           Class<? extends Join> joinClass,
                                           RelBuilderFactory relBuilderFactory)

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)