org.apache.calcite.rel.rules

Class AggregateMergeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.calcite.rel.rules.AggregateMergeRule

All Implemented Interfaces:

TransformationRule

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

Planner rule that matches an Aggregate on a Aggregate and the top aggregate's group key is a subset of the lower aggregate's group key, and the aggregates are expansions of rollups, then it would convert into a single aggregate.

For example, SUM of SUM becomes SUM; SUM of COUNT becomes COUNT; MAX of MAX becomes MAX; MIN of MIN becomes MIN. AVG of AVG would not match, nor would COUNT of COUNT.

See Also:

CoreRules.AGGREGATE_MERGE

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	AggregateMergeRule.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	AggregateMergeRule(AggregateMergeRule.Config config) Creates an AggregateMergeRule.
	AggregateMergeRule(RelOptRuleOperand operand, 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

AggregateMergeRule

protected AggregateMergeRule(AggregateMergeRule.Config config)

Creates an AggregateMergeRule.

AggregateMergeRule

@Deprecated
public AggregateMergeRule(RelOptRuleOperand operand,
                                      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)