Package org.apache.calcite.rel.rules

Class JoinDeriveIsNotNullFilterRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.calcite.rel.rules.JoinDeriveIsNotNullFilterRule

All Implemented Interfaces:

TransformationRule

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

Planner rule that derives IS NOT NULL predicates from a inner Join and creates Filters with those predicates as new inputs of the join.

Since the Null value can never match in the inner join, and it can lead to skewness due to too many Null values, a not-null filter can be created and pushed down into the input of join.

Similar to CoreRules.FILTER_INTO_JOIN, it would try to create filters and push them into the inputs of the join to filter data as much as possible before join.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	JoinDeriveIsNotNullFilterRule.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	Description
JoinDeriveIsNotNullFilterRule(JoinDeriveIsNotNullFilterRule.Config config)

Method Summary

Modifier and Type	Method	Description
void	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

Methods inherited from class java.lang.Object

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

Constructor Details

JoinDeriveIsNotNullFilterRule

public JoinDeriveIsNotNullFilterRule(JoinDeriveIsNotNullFilterRule.Config config)

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)