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[FLINK-12133] [table-runtime-blink] Support unbounded aggregate in st…
…reaming table runtime This closes apache#8202
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131 changes: 131 additions & 0 deletions
131
...blink/src/main/java/org/apache/flink/table/functions/aggfunctions/CollectAggFunction.java
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| @@ -0,0 +1,131 @@ | ||
| /* | ||
| * 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package org.apache.flink.table.functions.aggfunctions; | ||
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| import org.apache.flink.api.common.typeinfo.TypeInformation; | ||
| import org.apache.flink.api.common.typeinfo.Types; | ||
| import org.apache.flink.api.java.typeutils.MapTypeInfo; | ||
| import org.apache.flink.table.api.dataview.MapView; | ||
| import org.apache.flink.table.functions.AggregateFunction; | ||
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
|
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| /** | ||
| * Aggregate function for COLLECT. | ||
| * @param <T> type of collect element. | ||
| */ | ||
| public class CollectAggFunction<T> | ||
| extends AggregateFunction<Map<T, Integer>, CollectAggFunction.CollectAccumulator<T>> { | ||
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| private static final long serialVersionUID = -5860934997657147836L; | ||
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| private final TypeInformation<T> elementType; | ||
|
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| public CollectAggFunction(TypeInformation<T> elementType) { | ||
| this.elementType = elementType; | ||
| } | ||
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| /** The initial accumulator for Collect aggregate function. */ | ||
| public static class CollectAccumulator<T> { | ||
| public MapView<T, Integer> map = null; | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| CollectAccumulator<?> that = (CollectAccumulator<?>) o; | ||
| return Objects.equals(map, that.map); | ||
| } | ||
| } | ||
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| public CollectAccumulator<T> createAccumulator() { | ||
| CollectAccumulator<T> acc = new CollectAccumulator<>(); | ||
| acc.map = new MapView<>(elementType, Types.INT); | ||
| return acc; | ||
| } | ||
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| public void resetAccumulator(CollectAccumulator<T> accumulator) { | ||
| accumulator.map.clear(); | ||
| } | ||
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| public void accumulate(CollectAccumulator<T> accumulator, T value) throws Exception { | ||
| if (value != null) { | ||
| Integer count = accumulator.map.get(value); | ||
| if (count != null) { | ||
| accumulator.map.put(value, count + 1); | ||
| } else { | ||
| accumulator.map.put(value, 1); | ||
| } | ||
| } | ||
| } | ||
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| public void retract(CollectAccumulator<T> accumulator, T value) throws Exception { | ||
| if (value != null) { | ||
| Integer count = accumulator.map.get(value); | ||
| if (count != null) { | ||
| if (count == 1) { | ||
| accumulator.map.remove(value); | ||
| } else { | ||
| accumulator.map.put(value, count - 1); | ||
| } | ||
| } else { | ||
| accumulator.map.put(value, -1); | ||
| } | ||
| } | ||
| } | ||
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| public void merge(CollectAccumulator<T> accumulator, Iterable<CollectAccumulator<T>> others) throws Exception { | ||
| for (CollectAccumulator<T> other : others) { | ||
| for (Map.Entry<T, Integer> entry : other.map.entries()) { | ||
| T key = entry.getKey(); | ||
| Integer newCount = entry.getValue(); | ||
| Integer oldCount = accumulator.map.get(key); | ||
| if (oldCount == null) { | ||
| accumulator.map.put(key, newCount); | ||
| } else { | ||
| accumulator.map.put(key, oldCount + newCount); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public Map<T, Integer> getValue(CollectAccumulator<T> accumulator) { | ||
| Map<T, Integer> result = new HashMap<>(); | ||
| try { | ||
| for (Map.Entry<T, Integer> entry : accumulator.map.entries()) { | ||
| result.put(entry.getKey(), entry.getValue()); | ||
| } | ||
| return result; | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| @Override | ||
| public TypeInformation<Map<T, Integer>> getResultType() { | ||
| return new MapTypeInfo<>(elementType, Types.INT); | ||
| } | ||
| } |
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