Package org.apache.calcite.rel.rules
Class AbstractJoinExtractFilterRule
java.lang.Object
org.apache.calcite.plan.RelOptRule
org.apache.calcite.plan.RelRule<AbstractJoinExtractFilterRule.Config>
org.apache.calcite.rel.rules.AbstractJoinExtractFilterRule
- All Implemented Interfaces:
TransformationRule
- Direct Known Subclasses:
JoinExtractFilterRule
public abstract class AbstractJoinExtractFilterRule
extends RelRule<AbstractJoinExtractFilterRule.Config>
implements TransformationRule
Rule to convert an
inner join
to a
filter
on top of a
cartesian inner join
.
One benefit of this transformation is that after it, the join condition
can be combined with conditions and expressions above the join. It also makes
the FennelCartesianJoinRule
applicable.
The constructor is parameterized to allow any sub-class of
Join
.
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Nested Class Summary
Modifier and TypeClassDescriptionstatic interface
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
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Field Summary
Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
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Constructor Summary
ModifierConstructorDescriptionprotected
Creates an AbstractJoinExtractFilterRule. -
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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AbstractJoinExtractFilterRule
Creates an AbstractJoinExtractFilterRule.
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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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