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[FLINK-34587][table] Introduce MODE aggregate function
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74 changes: 74 additions & 0 deletions
74
.../test/java/org/apache/flink/table/planner/functions/aggfunctions/ModeAggFunctionTest.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.flink.table.planner.functions.aggfunctions; | ||
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| import org.apache.flink.table.data.StringData; | ||
| import org.apache.flink.table.runtime.functions.aggregate.ModeAggFunction; | ||
| import org.apache.flink.table.types.logical.VarCharType; | ||
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| import java.lang.reflect.Method; | ||
| import java.util.Arrays; | ||
| import java.util.List; | ||
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| import static org.apache.flink.table.data.StringData.fromString; | ||
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| /** Test case for built-in MODE with retraction aggregate function. */ | ||
| final class ModeAggFunctionTest | ||
| extends AggFunctionTestBase<StringData, StringData, ModeAggFunction.ModeAcc<StringData>> { | ||
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| @Override | ||
| protected List<List<StringData>> getInputValueSets() { | ||
| return Arrays.asList( | ||
| Arrays.asList(fromString("1"), fromString("1"), fromString("3")), | ||
| Arrays.asList(fromString("4"), null, fromString("4")), | ||
| Arrays.asList(null, null), | ||
| Arrays.asList( | ||
| null, | ||
| fromString("2"), | ||
| fromString("1"), | ||
| fromString("2"), | ||
| fromString("2"), | ||
| fromString("1"))); | ||
| } | ||
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| @Override | ||
| protected List<StringData> getExpectedResults() { | ||
| return Arrays.asList(fromString("1"), fromString("4"), null, fromString("2")); | ||
| } | ||
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| @Override | ||
| protected ModeAggFunction<StringData> getAggregator() { | ||
| return new ModeAggFunction<>(new VarCharType()); | ||
| } | ||
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| @Override | ||
| protected Class<?> getAccClass() { | ||
| return ModeAggFunction.ModeAcc.class; | ||
| } | ||
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| @Override | ||
| protected Method getAccumulateFunc() throws NoSuchMethodException { | ||
| return getAggregator().getClass().getMethod("accumulate", getAccClass(), Object.class); | ||
| } | ||
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| @Override | ||
| protected Method getRetractFunc() throws NoSuchMethodException { | ||
| return getAggregator().getClass().getMethod("retract", getAccClass(), Object.class); | ||
| } | ||
| } |
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175 changes: 175 additions & 0 deletions
175
...ime/src/main/java/org/apache/flink/table/runtime/functions/aggregate/ModeAggFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.flink.table.runtime.functions.aggregate; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.table.api.DataTypes; | ||
| import org.apache.flink.table.api.dataview.MapView; | ||
| import org.apache.flink.table.types.DataType; | ||
| import org.apache.flink.table.types.logical.LogicalType; | ||
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| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
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| import static org.apache.flink.table.types.utils.DataTypeUtils.toInternalDataType; | ||
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| /** Built-in MODE with retraction aggregate function. */ | ||
| @Internal | ||
| public class ModeAggFunction<T> extends BuiltInAggregateFunction<T, ModeAggFunction.ModeAcc<T>> { | ||
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| private final transient DataType valueDataType; | ||
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| public ModeAggFunction(LogicalType valueType) { | ||
| this.valueDataType = toInternalDataType(valueType); | ||
| } | ||
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| @Override | ||
| public List<DataType> getArgumentDataTypes() { | ||
| return Collections.singletonList(valueDataType); | ||
| } | ||
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| @Override | ||
| public DataType getOutputDataType() { | ||
| return valueDataType; | ||
| } | ||
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| @Override | ||
| public T getValue(ModeAcc<T> accumulator) { | ||
| return accumulator.curMode; | ||
| } | ||
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| @Override | ||
| public ModeAcc<T> createAccumulator() { | ||
| final ModeAcc<T> acc = new ModeAcc<>(); | ||
| acc.buffer = new MapView<>(); | ||
| acc.curCnt = 0; | ||
| acc.curMode = null; | ||
| return acc; | ||
| } | ||
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| @Override | ||
| public DataType getAccumulatorDataType() { | ||
| return DataTypes.STRUCTURED( | ||
| ModeAcc.class, | ||
| DataTypes.FIELD("curCnt", DataTypes.BIGINT()), | ||
| DataTypes.FIELD("curMode", valueDataType.nullable()), | ||
| DataTypes.FIELD( | ||
| "buffer", | ||
| MapView.newMapViewDataType(valueDataType.notNull(), DataTypes.BIGINT()))); | ||
| } | ||
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| /** Accumulator for MODE. */ | ||
| public static class ModeAcc<T> { | ||
| public long curCnt; | ||
| public T curMode; | ||
| public MapView<T, Long> buffer; | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| ModeAcc<?> lagAcc = (ModeAcc<?>) o; | ||
| return curCnt == lagAcc.curCnt | ||
| && Objects.equals(curMode, lagAcc.curMode) | ||
| && Objects.equals(buffer, lagAcc.buffer); | ||
| } | ||
|
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(curCnt, curMode, buffer); | ||
| } | ||
| } | ||
|
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| public void accumulate(ModeAcc<T> acc, T value) throws Exception { | ||
| if (value == null) { | ||
| return; | ||
| } | ||
| Long cnt = acc.buffer.get(value); | ||
| cnt = cnt == null ? 1 : cnt + 1; | ||
| acc.buffer.put(value, cnt); | ||
| if (Objects.equals(value, acc.curMode)) { | ||
| acc.curCnt = cnt; | ||
| } else if (cnt > acc.curCnt) { | ||
| acc.curMode = value; | ||
| acc.curCnt = cnt; | ||
| } | ||
| } | ||
|
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| public void retract(ModeAcc<T> acc, T value) throws Exception { | ||
| if (value == null) { | ||
| return; | ||
| } | ||
| Long cnt = acc.buffer.get(value); | ||
| cnt = cnt == null ? 0L : cnt - 1; | ||
| if (cnt <= 0) { | ||
| acc.buffer.remove(value); | ||
| } else { | ||
| acc.buffer.put(value, cnt); | ||
| } | ||
| acc.curCnt = cnt; | ||
| if (Objects.equals(value, acc.curMode)) { | ||
| for (Map.Entry<T, Long> entry : acc.buffer.entries()) { | ||
| if (entry.getValue() > acc.curCnt) { | ||
| acc.curMode = entry.getKey(); | ||
| acc.curCnt = entry.getValue(); | ||
| } | ||
| } | ||
| } | ||
| if (acc.curCnt == 0) { | ||
| acc.curMode = null; | ||
| } | ||
| } | ||
|
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| public void resetAccumulator(ModeAcc<T> acc) { | ||
| acc.buffer.clear(); | ||
| acc.curCnt = 0; | ||
| acc.curMode = null; | ||
| } | ||
|
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| public void merge(ModeAggFunction.ModeAcc<T> acc, Iterable<ModeAggFunction.ModeAcc<T>> its) | ||
| throws Exception { | ||
| for (ModeAggFunction.ModeAcc<T> otherAcc : its) { | ||
| if (!otherAcc.buffer.iterator().hasNext()) { | ||
| // otherAcc is empty, skip it | ||
| continue; | ||
| } | ||
| for (Map.Entry<T, Long> entry : otherAcc.buffer.entries()) { | ||
| final T key = entry.getKey(); | ||
| final long newValue; | ||
| if (acc.buffer.contains(key)) { | ||
| newValue = acc.buffer.get(key) + entry.getValue(); | ||
| acc.buffer.put(key, newValue); | ||
| } else { | ||
| newValue = entry.getValue(); | ||
| acc.buffer.put(key, newValue); | ||
| } | ||
| if (newValue > acc.curCnt) { | ||
| acc.curMode = key; | ||
| acc.curCnt = newValue; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |