org.apache.calcite.rel.rules

Class AggregateExpandDistinctAggregatesRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.calcite.rel.rules.AggregateExpandDistinctAggregatesRule

All Implemented Interfaces:

TransformationRule

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

Planner rule that expands distinct aggregates (such as COUNT(DISTINCT x)) from a Aggregate.

How this is done depends upon the arguments to the function. If all functions have the same argument (e.g. COUNT(DISTINCT x), SUM(DISTINCT x) both have the argument x) then one extra Aggregate is sufficient.

If there are multiple arguments (e.g. COUNT(DISTINCT x), COUNT(DISTINCT y)) the rule creates separate Aggregates and combines using a Join.

See Also:

CoreRules.AGGREGATE_EXPAND_DISTINCT_AGGREGATES, CoreRules.AGGREGATE_EXPAND_DISTINCT_AGGREGATES_TO_JOIN

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	AggregateExpandDistinctAggregatesRule.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

Constructor and Description
AggregateExpandDistinctAggregatesRule(Class<? extends Aggregate> clazz, boolean useGroupingSets, RelBuilderFactory relBuilderFactory) Deprecated.
AggregateExpandDistinctAggregatesRule(Class<? extends LogicalAggregate> clazz, boolean useGroupingSets, RelFactories.JoinFactory joinFactory) Deprecated.
AggregateExpandDistinctAggregatesRule(Class<? extends LogicalAggregate> clazz, RelFactories.JoinFactory joinFactory) 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

AggregateExpandDistinctAggregatesRule

@Deprecated
public AggregateExpandDistinctAggregatesRule(Class<? extends Aggregate> clazz,
                                                         boolean useGroupingSets,
                                                         RelBuilderFactory relBuilderFactory)

Deprecated.

AggregateExpandDistinctAggregatesRule

@Deprecated
public AggregateExpandDistinctAggregatesRule(Class<? extends LogicalAggregate> clazz,
                                                         boolean useGroupingSets,
                                                         RelFactories.JoinFactory joinFactory)

Deprecated.

AggregateExpandDistinctAggregatesRule

@Deprecated
public AggregateExpandDistinctAggregatesRule(Class<? extends LogicalAggregate> clazz,
                                                         RelFactories.JoinFactory joinFactory)

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)