Package 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
@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:
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Nested Class Summary
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
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Field Summary
Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
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Constructor Summary
ModifierConstructorDescriptionAggregateMergeRule
(RelOptRuleOperand operand, RelBuilderFactory relBuilderFactory) Deprecated.protected
Creates an AggregateMergeRule. -
Method Summary
Modifier and TypeMethodDescriptionvoid
onMatch
(RelOptRuleCall call) Receives notification about a rule match.Methods inherited from class org.apache.calcite.plan.RelOptRule
any, convert, convert, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered
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Constructor Details
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AggregateMergeRule
Creates an AggregateMergeRule. -
AggregateMergeRule
@Deprecated public AggregateMergeRule(RelOptRuleOperand operand, RelBuilderFactory relBuilderFactory) Deprecated.
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Method Details
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onMatch
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 classRelOptRule
- Parameters:
call
- Rule call- See Also:
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