| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.wayang.java.operators; |
| |
| import org.apache.wayang.basic.operators.IntersectOperator; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.optimizer.cardinality.CardinalityEstimate; |
| import org.apache.wayang.core.optimizer.costs.LoadProfileEstimators; |
| import org.apache.wayang.core.plan.wayangplan.ExecutionOperator; |
| import org.apache.wayang.core.platform.ChannelDescriptor; |
| import org.apache.wayang.core.platform.ChannelInstance; |
| import org.apache.wayang.core.platform.lineage.ExecutionLineageNode; |
| import org.apache.wayang.core.types.DataSetType; |
| import org.apache.wayang.core.util.Tuple; |
| import org.apache.wayang.java.channels.CollectionChannel; |
| import org.apache.wayang.java.channels.JavaChannelInstance; |
| import org.apache.wayang.java.channels.StreamChannel; |
| import org.apache.wayang.java.execution.JavaExecutor; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| /** |
| * Java implementation of the {@link IntersectOperator}. |
| */ |
| public class JavaIntersectOperator<Type> |
| extends IntersectOperator<Type> |
| implements JavaExecutionOperator { |
| |
| public JavaIntersectOperator(DataSetType<Type> dataSetType) { |
| super(dataSetType); |
| } |
| |
| public JavaIntersectOperator(Class<Type> typeClass) { |
| super(typeClass); |
| } |
| |
| /** |
| * Copies an instance (exclusive of broadcasts). |
| * |
| * @param that that should be copied |
| */ |
| public JavaIntersectOperator(IntersectOperator<Type> that) { |
| super(that); |
| } |
| |
| @Override |
| public Tuple<Collection<ExecutionLineageNode>, Collection<ChannelInstance>> evaluate( |
| ChannelInstance[] inputs, |
| ChannelInstance[] outputs, |
| JavaExecutor javaExecutor, |
| OptimizationContext.OperatorContext operatorContext) { |
| assert inputs.length == this.getNumInputs(); |
| assert outputs.length == this.getNumOutputs(); |
| |
| // Strategy: |
| // 1) Create a probing table for the smaller input. This must be a set to deal with duplicates there. |
| // 2) Probe the greater input against the table. Remove on probing to deal with duplicates there. |
| |
| final CardinalityEstimate cardinalityEstimate0 = operatorContext.getInputCardinality(0); |
| final CardinalityEstimate cardinalityEstimate1 = operatorContext.getOutputCardinality(0); |
| |
| ExecutionLineageNode indexingExecutionLineageNode = new ExecutionLineageNode(operatorContext); |
| indexingExecutionLineageNode.add(LoadProfileEstimators.createFromSpecification( |
| "wayang.java.intersect.load.indexing", javaExecutor.getConfiguration() |
| )); |
| ExecutionLineageNode probingExecutionLineageNode = new ExecutionLineageNode(operatorContext); |
| probingExecutionLineageNode.add(LoadProfileEstimators.createFromSpecification( |
| "wayang.java.intersect.load.probing", javaExecutor.getConfiguration() |
| )); |
| |
| boolean isMaterialize0 = cardinalityEstimate0 != null && |
| cardinalityEstimate1 != null && |
| cardinalityEstimate0.getUpperEstimate() <= cardinalityEstimate1.getUpperEstimate(); |
| |
| final Collection<ExecutionLineageNode> executionLineageNodes = new LinkedList<>(); |
| final Collection<ChannelInstance> producedChannelInstances = new LinkedList<>(); |
| final Stream<Type> candidateStream; |
| final Set<Type> probingTable; |
| if (isMaterialize0) { |
| candidateStream = ((JavaChannelInstance) inputs[0]).provideStream(); |
| probingTable = this.createProbingTable(((JavaChannelInstance) inputs[1]).provideStream()); |
| indexingExecutionLineageNode.addPredecessor(inputs[0].getLineage()); |
| probingExecutionLineageNode.addPredecessor(inputs[1].getLineage()); |
| } else { |
| candidateStream = ((JavaChannelInstance) inputs[1]).provideStream(); |
| probingTable = this.createProbingTable(((JavaChannelInstance) inputs[0]).provideStream()); |
| indexingExecutionLineageNode.addPredecessor(inputs[1].getLineage()); |
| probingExecutionLineageNode.addPredecessor(inputs[0].getLineage()); |
| } |
| |
| Stream<Type> intersectStream = candidateStream.filter(probingTable::remove); |
| ((StreamChannel.Instance) outputs[0]).accept(intersectStream); |
| outputs[0].getLineage().addPredecessor(probingExecutionLineageNode); |
| |
| indexingExecutionLineageNode.collectAndMark(executionLineageNodes, producedChannelInstances); |
| return new Tuple<>(executionLineageNodes, producedChannelInstances); |
| } |
| |
| /** |
| * Creates a new probing table. The can be altered then. |
| * |
| * @param stream for that the probing table should be created |
| * @return the probing table |
| */ |
| private Set<Type> createProbingTable(Stream<Type> stream) { |
| return stream.collect(Collectors.toSet()); |
| } |
| |
| @Override |
| public Collection<String> getLoadProfileEstimatorConfigurationKeys() { |
| return Arrays.asList("wayang.java.intersect.load.indexing", "wayang.java.intersect.load.probing"); |
| } |
| |
| @Override |
| protected ExecutionOperator createCopy() { |
| return new JavaIntersectOperator<>(this.getType()); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedInputChannels(int index) { |
| assert index <= this.getNumInputs() || (index == 0 && this.getNumInputs() == 0); |
| return Arrays.asList(CollectionChannel.DESCRIPTOR, StreamChannel.DESCRIPTOR); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedOutputChannels(int index) { |
| assert index <= this.getNumOutputs() || (index == 0 && this.getNumOutputs() == 0); |
| return Collections.singletonList(StreamChannel.DESCRIPTOR); |
| } |
| |
| } |