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Merge pull request apache#5447 from seznam/dsl-euphoria
[BEAM-3900] Join operator translation, Beam windowing, new tests from operator testsuite enabled .
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...horia-beam/src/main/java/org/apache/beam/sdk/extensions/euphoria/beam/JoinTranslator.java
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| /* | ||
| * 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.beam.sdk.extensions.euphoria.beam; | ||
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| import java.util.List; | ||
| import org.apache.beam.sdk.coders.Coder; | ||
| import org.apache.beam.sdk.coders.KvCoder; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.common.InputToKvDoFn; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.io.KryoCoder; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.join.FullJoinFn; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.join.InnerJoinFn; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.join.JoinFn; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.join.LeftOuterJoinFn; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.join.RightOuterJoinFn; | ||
| import org.apache.beam.sdk.extensions.euphoria.beam.window.WindowingUtils; | ||
| import org.apache.beam.sdk.extensions.euphoria.core.client.dataset.windowing.Window; | ||
| import org.apache.beam.sdk.extensions.euphoria.core.client.functional.BinaryFunctor; | ||
| import org.apache.beam.sdk.extensions.euphoria.core.client.functional.UnaryFunction; | ||
| import org.apache.beam.sdk.extensions.euphoria.core.client.operator.Join; | ||
| import org.apache.beam.sdk.extensions.euphoria.core.client.util.Pair; | ||
| import org.apache.beam.sdk.transforms.ParDo; | ||
| import org.apache.beam.sdk.transforms.join.CoGbkResult; | ||
| import org.apache.beam.sdk.transforms.join.CoGroupByKey; | ||
| import org.apache.beam.sdk.transforms.join.KeyedPCollectionTuple; | ||
| import org.apache.beam.sdk.values.KV; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.apache.beam.sdk.values.TupleTag; | ||
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| /** | ||
| * {@link OperatorTranslator Translator } for Euphoria {@link Join} operator. | ||
| */ | ||
| public class JoinTranslator implements OperatorTranslator<Join> { | ||
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| @Override | ||
| @SuppressWarnings("unchecked") | ||
| public PCollection<?> translate(Join operator, BeamExecutorContext context) { | ||
| return doTranslate(operator, context); | ||
| } | ||
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| public <K, LeftT, RightT, OutputT, W extends Window<W>> PCollection<Pair<K, OutputT>> | ||
| doTranslate(Join<LeftT, RightT, K, OutputT, W> operator, BeamExecutorContext context) { | ||
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| Coder<K> keyCoder = context.getCoder(operator.getLeftKeyExtractor()); | ||
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| // get input data-sets transformed to Pcollections<KV<K,LeftT/RightT>> | ||
| List<PCollection<Object>> inputs = context.getInputs(operator); | ||
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| PCollection<KV<K, LeftT>> leftKvInput = getKVInputCollection(inputs.get(0), | ||
| operator.getLeftKeyExtractor(), | ||
| keyCoder, new KryoCoder<>(), "::extract-keys-left"); | ||
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| PCollection<KV<K, RightT>> rightKvInput = getKVInputCollection(inputs.get(1), | ||
| operator.getRightKeyExtractor(), | ||
| keyCoder, new KryoCoder<>(), "::extract-keys-right"); | ||
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| // and apply the same widowing on input Pcolections since the documentation states: | ||
| //'all of the PCollections you want to group must use the same | ||
| // windowing strategy and window sizing' | ||
| leftKvInput = WindowingUtils.applyWindowingIfSpecified( | ||
| operator, leftKvInput, context.getAllowedLateness(operator)); | ||
| rightKvInput = WindowingUtils.applyWindowingIfSpecified( | ||
| operator, rightKvInput, context.getAllowedLateness(operator)); | ||
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| // GoGroupByKey collections | ||
| TupleTag<LeftT> leftTag = new TupleTag<>(); | ||
| TupleTag<RightT> rightTag = new TupleTag<>(); | ||
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| PCollection<KV<K, CoGbkResult>> coGrouped = KeyedPCollectionTuple | ||
| .of(leftTag, leftKvInput) | ||
| .and(rightTag, rightKvInput) | ||
| .apply("::co-group-by-key", CoGroupByKey.create()); | ||
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| // Join | ||
| JoinFn<LeftT, RightT, K, OutputT> joinFn = chooseJoinFn(operator, leftTag, rightTag); | ||
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| return coGrouped.apply(joinFn.getFnName(), ParDo.of(joinFn)); | ||
| } | ||
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| private <K, ValueT> PCollection<KV<K, ValueT>> getKVInputCollection( | ||
| PCollection<Object> inputPCollection, | ||
| UnaryFunction<ValueT, K> keyExtractor, | ||
| Coder<K> keyCoder, Coder<ValueT> valueCoder, String transformName) { | ||
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| @SuppressWarnings("unchecked") | ||
| PCollection<ValueT> typedInput = (PCollection<ValueT>) inputPCollection; | ||
| typedInput.setCoder(valueCoder); | ||
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| PCollection<KV<K, ValueT>> kvInput = | ||
| typedInput.apply(transformName, ParDo.of(new InputToKvDoFn<>(keyExtractor))); | ||
| kvInput.setCoder(KvCoder.of(keyCoder, valueCoder)); | ||
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| return kvInput; | ||
| } | ||
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| private <K, LeftT, RightT, OutputT, W extends Window<W>> JoinFn<LeftT, RightT, K, OutputT> | ||
| chooseJoinFn( | ||
| Join<LeftT, RightT, K, OutputT, W> operator, TupleTag<LeftT> leftTag, | ||
| TupleTag<RightT> rightTag) { | ||
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| JoinFn<LeftT, RightT, K, OutputT> joinFn; | ||
| BinaryFunctor<LeftT, RightT, OutputT> joiner = operator.getJoiner(); | ||
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| switch (operator.getType()) { | ||
| case INNER: | ||
| joinFn = new InnerJoinFn<>(joiner, leftTag, rightTag); | ||
| break; | ||
| case LEFT: | ||
| joinFn = new LeftOuterJoinFn<>(joiner, leftTag, rightTag); | ||
| break; | ||
| case RIGHT: | ||
| joinFn = new RightOuterJoinFn<>(joiner, leftTag, rightTag); | ||
| break; | ||
| case FULL: | ||
| joinFn = new FullJoinFn<>(joiner, leftTag, rightTag); | ||
| break; | ||
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| default: | ||
| throw new UnsupportedOperationException(String.format( | ||
| "Cannot translate Euphoria '%s' operator to Beam transformations." | ||
| + " Given join type '%s' is not supported.", | ||
| Join.class.getSimpleName(), operator.getType())); | ||
| } | ||
| return joinFn; | ||
| } | ||
| } |
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