| /* |
| * 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.flink.operators; |
| |
| import org.apache.flink.api.common.functions.GroupReduceFunction; |
| import org.apache.flink.api.java.DataSet; |
| import org.apache.flink.api.java.functions.KeySelector; |
| import org.apache.wayang.basic.operators.GroupByOperator; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.function.FunctionDescriptor; |
| import org.apache.wayang.core.function.TransformationDescriptor; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.optimizer.costs.LoadProfileEstimator; |
| 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.flink.channels.DataSetChannel; |
| import org.apache.wayang.flink.execution.FlinkExecutor; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| |
| /** |
| * Flink implementation of the {@link GroupByOperator}. |
| */ |
| public class FlinkGroupByOperator<InputType, KeyType> extends GroupByOperator<InputType, KeyType> implements FlinkExecutionOperator { |
| |
| /** |
| * Creates a new instance. |
| */ |
| public FlinkGroupByOperator(TransformationDescriptor<InputType, KeyType> keydescriptor, |
| DataSetType<InputType> inputType, |
| DataSetType<KeyType> keyType ) { |
| super((FunctionDescriptor.SerializableFunction<InputType, KeyType>) keydescriptor.getJavaImplementation(), |
| inputType.getDataUnitType().getTypeClass(), |
| keyType.getDataUnitType().getTypeClass()); |
| } |
| |
| /** |
| * Copies an instance (exclusive of broadcasts). |
| * |
| * @param that that should be copied |
| */ |
| public FlinkGroupByOperator(GroupByOperator<InputType, KeyType> that) { |
| super(that); |
| } |
| |
| @Override |
| public Tuple<Collection<ExecutionLineageNode>, Collection<ChannelInstance>> evaluate( |
| ChannelInstance[] inputs, |
| ChannelInstance[] outputs, |
| FlinkExecutor flinkExecutor, |
| OptimizationContext.OperatorContext operatorContext) { |
| assert inputs.length == this.getNumInputs(); |
| assert outputs.length == this.getNumOutputs(); |
| final DataSetChannel.Instance input = (DataSetChannel.Instance) inputs[0]; |
| final DataSetChannel.Instance output = (DataSetChannel.Instance) outputs[0]; |
| |
| |
| final KeySelector<InputType, KeyType> keySelector = flinkExecutor.compiler.compileKeySelector(this.getKeyDescriptor()); |
| |
| final DataSet<InputType> dataSetInput = input.provideDataSet(); |
| |
| |
| final DataSet<Iterable<InputType>> dataSetOutput = dataSetInput.groupBy(keySelector).reduceGroup( |
| (GroupReduceFunction<InputType, Iterable<InputType>>) (iterable, collector) -> { |
| Collection<InputType> dataUnitGroup = new ArrayList<>(); |
| iterable.forEach(dataUnitGroup::add); |
| collector.collect(dataUnitGroup); |
| } |
| ); |
| |
| output.accept(dataSetOutput, flinkExecutor); |
| |
| return ExecutionOperator.modelLazyExecution(inputs, outputs, operatorContext); |
| } |
| |
| @Override |
| public boolean containsAction() { |
| return false; |
| } |
| |
| @Override |
| protected ExecutionOperator createCopy() { |
| return new FlinkGroupByOperator<InputType, KeyType>(this); |
| } |
| |
| |
| @Override |
| public String getLoadProfileEstimatorConfigurationKey() { |
| return "wayang.flink.groupby.load"; |
| } |
| |
| @Override |
| public Optional<LoadProfileEstimator> createLoadProfileEstimator(Configuration configuration) { |
| final Optional<LoadProfileEstimator> optEstimator = |
| FlinkExecutionOperator.super.createLoadProfileEstimator(configuration); |
| LoadProfileEstimators.nestUdfEstimator(optEstimator, this.getKeyDescriptor(), configuration); |
| return optEstimator; |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedInputChannels(int index) { |
| assert index <= this.getNumInputs() || (index == 0 && this.getNumInputs() == 0); |
| return Arrays.asList(DataSetChannel.DESCRIPTOR, DataSetChannel.DESCRIPTOR_MANY); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedOutputChannels(int index) { |
| assert index <= this.getNumOutputs() || (index == 0 && this.getNumOutputs() == 0); |
| return Collections.singletonList(DataSetChannel.DESCRIPTOR); |
| } |
| } |