it.unibz.inf.ontop.iq.optimizer.impl.lj

Class CardinalitySensitiveJoinTransferLJOptimizer.Transformer

java.lang.Object

it.unibz.inf.ontop.iq.transform.impl.DefaultNonRecursiveIQTreeTransformer

it.unibz.inf.ontop.iq.optimizer.impl.lj.AbstractJoinTransferLJTransformer

it.unibz.inf.ontop.iq.optimizer.impl.lj.CardinalitySensitiveJoinTransferLJOptimizer.Transformer

All Implemented Interfaces:

IQTreeTransformer, IQTreeVisitingTransformer

Enclosing class:

CardinalitySensitiveJoinTransferLJOptimizer

protected static class CardinalitySensitiveJoinTransferLJOptimizer.Transformer
extends AbstractJoinTransferLJTransformer

Nested Class Summary

Nested classes/interfaces inherited from class it.unibz.inf.ontop.iq.optimizer.impl.lj.AbstractJoinTransferLJTransformer

AbstractJoinTransferLJTransformer.DataNodeAndReplacement, AbstractJoinTransferLJTransformer.RenamingAndEqualities, AbstractJoinTransferLJTransformer.ReplaceNodeByTrueTransformer, AbstractJoinTransferLJTransformer.SelectedNode

Field Summary

Fields inherited from class it.unibz.inf.ontop.iq.optimizer.impl.lj.AbstractJoinTransferLJTransformer

optimizationSingletons, requiredDataNodeExtractor, rightProvenanceNormalizer, variableGenerator

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Transformer(Supplier<VariableNullability> variableNullabilitySupplier, VariableGenerator variableGenerator, RequiredExtensionalDataNodeExtractor requiredDataNodeExtractor, RightProvenanceNormalizer rightProvenanceNormalizer, OptimizationSingletons optimizationSingletons)

Method Summary

Modifier and Type	Method and Description
protected Stream<ExtensionalDataNode>	extractRightDataNodes(IQTree rightChild) Temporary restriction to avoid overlap with the existing LJ optimization techniques Ignores the case where a single extensional data node appears on the right.
protected Optional<AbstractJoinTransferLJTransformer.SelectedNode>	selectForTransfer(ExtensionalDataNode rightDataNode, it.unibz.inf.ontop.com.google.common.collect.ImmutableMultimap<RelationDefinition,ExtensionalDataNode> leftMultimap)
protected IQTree	transformBySearchingFromScratch(IQTree tree)

Methods inherited from class it.unibz.inf.ontop.iq.optimizer.impl.lj.AbstractJoinTransferLJTransformer

furtherTransformLeftJoin, getInheritedVariableNullability, matchForeignKey, matchFunctionalDependency, matchIndexes, matchUniqueConstraint, preTransformLJRightChild, selectRightDataNodesToTransfer, transformBinaryNonCommutativeNode, transformBinaryNonCommutativeNode, transformDistinct, transformFilter, transformInnerJoin, transformLeftJoin, transformNaryCommutativeNode, transformNaryCommutativeNode, transformOrderBy, transformSlice, transformUnaryNode, transformUnaryNode

Methods inherited from class it.unibz.inf.ontop.iq.transform.impl.DefaultNonRecursiveIQTreeTransformer

transformAggregation, transformConstruction, transformEmpty, transformExtensionalData, transformIntensionalData, transformLeaf, transformNonStandardBinaryNonCommutativeNode, transformNonStandardLeafNode, transformNonStandardNaryNode, transformNonStandardUnaryNode, transformTrue, transformUnion

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface it.unibz.inf.ontop.iq.transform.IQTreeVisitingTransformer

transform

Constructor Detail

Transformer

protected Transformer(Supplier<VariableNullability> variableNullabilitySupplier,
                      VariableGenerator variableGenerator,
                      RequiredExtensionalDataNodeExtractor requiredDataNodeExtractor,
                      RightProvenanceNormalizer rightProvenanceNormalizer,
                      OptimizationSingletons optimizationSingletons)

Method Detail

selectForTransfer

protected Optional<AbstractJoinTransferLJTransformer.SelectedNode> selectForTransfer(ExtensionalDataNode rightDataNode,
                                                                                     it.unibz.inf.ontop.com.google.common.collect.ImmutableMultimap<RelationDefinition,ExtensionalDataNode> leftMultimap)

Specified by:

selectForTransfer in class AbstractJoinTransferLJTransformer

extractRightDataNodes

protected Stream<ExtensionalDataNode> extractRightDataNodes(IQTree rightChild)

Temporary restriction to avoid overlap with the existing LJ optimization techniques Ignores the case where a single extensional data node appears on the right. TODO: remove this restriction (after releasing 4.1)

Overrides:

extractRightDataNodes in class AbstractJoinTransferLJTransformer

transformBySearchingFromScratch

protected IQTree transformBySearchingFromScratch(IQTree tree)

Specified by:

transformBySearchingFromScratch in class AbstractJoinTransferLJTransformer