Package org.apache.calcite.rel.rules

Class PruneEmptyRules.RemoveEmptySingleRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<PruneEmptyRules.PruneEmptyRule.Config>

org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule

org.apache.calcite.rel.rules.PruneEmptyRules.RemoveEmptySingleRule

All Implemented Interfaces:

SubstitutionRule, TransformationRule

Enclosing class:

PruneEmptyRules

public static class PruneEmptyRules.RemoveEmptySingleRule
extends PruneEmptyRules.PruneEmptyRule

Rule that converts a relation into empty.

The users can control the application of the rule by:

• calling the appropriate constructor and passing the necessary configuration;
• extending the class through inheritance and overriding RelOptRule.matches(RelOptRuleCall)).

When using the deprecated constructors it is only possible to convert relations which strictly have a single input (SingleRel).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	PruneEmptyRules.RemoveEmptySingleRule.RemoveEmptySingleRuleConfig	Rule configuration.

Nested classes/interfaces inherited from class org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule

PruneEmptyRules.PruneEmptyRule.Config

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	Description
RemoveEmptySingleRule(Class<R> clazz, com.google.common.base.Predicate<R> predicate, RelBuilderFactory relBuilderFactory, String description)	Deprecated.
RemoveEmptySingleRule(Class<R> clazz, String description)	Deprecated.
RemoveEmptySingleRule(Class<R> clazz, Predicate<R> predicate, RelBuilderFactory relBuilderFactory, String description)	Deprecated.

Method Summary

Modifier and Type	Method	Description
void	onMatch(RelOptRuleCall call)	Receives notification about a rule match.

Methods inherited from class org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule

autoPruneOld

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

Methods inherited from class java.lang.Object

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

Constructor Details

RemoveEmptySingleRule

@Deprecated
public RemoveEmptySingleRule(Class<R> clazz,
 String description)

Deprecated.

RemoveEmptySingleRule

@Deprecated
public RemoveEmptySingleRule(Class<R> clazz,
 Predicate<R> predicate,
 RelBuilderFactory relBuilderFactory,
 String description)

Deprecated.

RemoveEmptySingleRule

@Deprecated
public RemoveEmptySingleRule(Class<R> clazz,
 com.google.common.base.Predicate<R> predicate,
 RelBuilderFactory relBuilderFactory,
 String description)

Deprecated.

Method Details

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)