it.unibz.inf.ontop.iq.executor.join

Class RedundantSelfJoinExecutor

java.lang.Object

it.unibz.inf.ontop.iq.executor.join.SelfJoinLikeExecutor

it.unibz.inf.ontop.iq.executor.join.RedundantSelfJoinExecutor

All Implemented Interfaces:

InnerJoinExecutor, NodeCentricExecutor<InnerJoinNode,NodeCentricOptimizationResults<InnerJoinNode>,InnerJoinOptimizationProposal>, ProposalExecutor<InnerJoinOptimizationProposal,NodeCentricOptimizationResults<InnerJoinNode>>, SimpleNodeCentricExecutor<InnerJoinNode,InnerJoinOptimizationProposal>

Direct Known Subclasses:

FunctionalDependencyUnificationExecutor, UCRedundantSelfJoinExecutor

public abstract class RedundantSelfJoinExecutor
extends SelfJoinLikeExecutor
implements InnerJoinExecutor

TODO: explain Assumption: clean inner join structure (an inner join does not have another inner join or filter node as a child). Naturally assumes that the data atoms are leafs.

Nested Class Summary

Nested classes/interfaces inherited from class it.unibz.inf.ontop.iq.executor.join.SelfJoinLikeExecutor

SelfJoinLikeExecutor.AtomUnificationException, SelfJoinLikeExecutor.ConcreteProposal, SelfJoinLikeExecutor.PredicateLevelProposal

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RedundantSelfJoinExecutor(IntermediateQueryFactory iqFactory, SubstitutionFactory substitutionFactory, ImmutableUnificationTools unificationTools, TermFactory termFactory)

Method Summary

Modifier and Type	Method and Description
NodeCentricOptimizationResults<InnerJoinNode>	apply(InnerJoinOptimizationProposal highLevelProposal, IntermediateQuery query, QueryTreeComponent treeComponent)
protected Optional<SelfJoinLikeExecutor.ConcreteProposal>	createConcreteProposal(com.google.common.collect.ImmutableList<SelfJoinLikeExecutor.PredicateLevelProposal> predicateProposals, com.google.common.collect.ImmutableMultimap<RelationPredicate,ExtensionalDataNode> initialDataNodeMap, com.google.common.collect.ImmutableList<Variable> priorityVariables)
protected abstract Optional<SelfJoinLikeExecutor.PredicateLevelProposal>	proposePerPredicate(InnerJoinNode joinNode, com.google.common.collect.ImmutableCollection<ExtensionalDataNode> initialNodes, RelationPredicate predicate, com.google.common.collect.ImmutableList<Variable> priorityVariables, IntermediateQuery query)

Methods inherited from class it.unibz.inf.ontop.iq.executor.join.SelfJoinLikeExecutor

extractArguments, extractDataNodes, extractSubstitutions, mergeSubstitutions, prioritizeVariables, proposeForGroupingMap, unifyRedundantNodes, updateJoinNodeAndPropagateSubstitution

Methods inherited from class java.lang.Object

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

Constructor Detail

RedundantSelfJoinExecutor

protected RedundantSelfJoinExecutor(IntermediateQueryFactory iqFactory,
                                    SubstitutionFactory substitutionFactory,
                                    ImmutableUnificationTools unificationTools,
                                    TermFactory termFactory)

Method Detail

apply

public NodeCentricOptimizationResults<InnerJoinNode> apply(InnerJoinOptimizationProposal highLevelProposal,
                                                           IntermediateQuery query,
                                                           QueryTreeComponent treeComponent)
                                                    throws InvalidQueryOptimizationProposalException,
                                                           EmptyQueryException

Specified by:

apply in interface ProposalExecutor<InnerJoinOptimizationProposal,NodeCentricOptimizationResults<InnerJoinNode>>

Throws:

InvalidQueryOptimizationProposalException

EmptyQueryException

createConcreteProposal

protected Optional<SelfJoinLikeExecutor.ConcreteProposal> createConcreteProposal(com.google.common.collect.ImmutableList<SelfJoinLikeExecutor.PredicateLevelProposal> predicateProposals,
                                                                                 com.google.common.collect.ImmutableMultimap<RelationPredicate,ExtensionalDataNode> initialDataNodeMap,
                                                                                 com.google.common.collect.ImmutableList<Variable> priorityVariables)

proposePerPredicate

protected abstract Optional<SelfJoinLikeExecutor.PredicateLevelProposal> proposePerPredicate(InnerJoinNode joinNode,
                                                                                             com.google.common.collect.ImmutableCollection<ExtensionalDataNode> initialNodes,
                                                                                             RelationPredicate predicate,
                                                                                             com.google.common.collect.ImmutableList<Variable> priorityVariables,
                                                                                             IntermediateQuery query)
                                                                                      throws SelfJoinLikeExecutor.AtomUnificationException

Throws:

SelfJoinLikeExecutor.AtomUnificationException