org.apache.calcite.rel.rules

Class AggregateRemoveRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.AggregateRemoveRule

public class AggregateRemoveRule
extends RelOptRule

Planner rule that removes a Aggregate if it computes no aggregate functions (that is, it is implementing SELECT DISTINCT) and the underlying relational expression is already distinct.

Field Summary

Fields

Modifier and Type	Field and Description
static AggregateRemoveRule	INSTANCE

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
AggregateRemoveRule(Class<? extends Aggregate> aggregateClass) Deprecated.
AggregateRemoveRule(Class<? extends Aggregate> aggregateClass, RelBuilderFactory relBuilderFactory) Creates an AggregateRemoveRule.

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, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, some, toString, unordered

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final AggregateRemoveRule INSTANCE

Constructor Detail

AggregateRemoveRule

@Deprecated
public AggregateRemoveRule(Class<? extends Aggregate> aggregateClass)

Deprecated.

AggregateRemoveRule

public AggregateRemoveRule(Class<? extends Aggregate> aggregateClass,
                           RelBuilderFactory relBuilderFactory)

Creates an AggregateRemoveRule.

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>) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)