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[FLINK-31663] Implement ARRAY_EXCEPT function
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103 changes: 103 additions & 0 deletions
103
...me/src/main/java/org/apache/flink/table/runtime/functions/scalar/ArrayExceptFunction.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * 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.scalar; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.table.data.ArrayData; | ||
| import org.apache.flink.table.data.GenericArrayData; | ||
| import org.apache.flink.table.functions.BuiltInFunctionDefinitions; | ||
| import org.apache.flink.table.functions.FunctionContext; | ||
| import org.apache.flink.table.functions.SpecializedFunction; | ||
| import org.apache.flink.table.runtime.util.EqualityAndHashcodeProvider; | ||
| import org.apache.flink.table.runtime.util.ObjectContainer; | ||
| import org.apache.flink.table.types.CollectionDataType; | ||
| import org.apache.flink.table.types.DataType; | ||
| import org.apache.flink.util.FlinkRuntimeException; | ||
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| import javax.annotation.Nullable; | ||
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| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| /** Implementation of {@link BuiltInFunctionDefinitions#ARRAY_EXCEPT}. */ | ||
| @Internal | ||
| public class ArrayExceptFunction extends BuiltInScalarFunction { | ||
| private final ArrayData.ElementGetter elementGetter; | ||
| private final EqualityAndHashcodeProvider equalityAndHashcodeProvider; | ||
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| public ArrayExceptFunction(SpecializedFunction.SpecializedContext context) { | ||
| super(BuiltInFunctionDefinitions.ARRAY_EXCEPT, context); | ||
| final DataType dataType = | ||
| ((CollectionDataType) context.getCallContext().getArgumentDataTypes().get(0)) | ||
| .getElementDataType() | ||
| .toInternal(); | ||
| elementGetter = ArrayData.createElementGetter(dataType.toInternal().getLogicalType()); | ||
| this.equalityAndHashcodeProvider = new EqualityAndHashcodeProvider(context, dataType); | ||
| } | ||
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| @Override | ||
| public void open(FunctionContext context) throws Exception { | ||
| equalityAndHashcodeProvider.open(context); | ||
| } | ||
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| public @Nullable ArrayData eval(ArrayData arrayOne, ArrayData arrayTwo) { | ||
| try { | ||
| if (arrayOne == null || arrayTwo == null) { | ||
| return null; | ||
| } | ||
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| List<Object> list = new ArrayList<>(); | ||
| Map<ObjectContainer, Integer> map = new HashMap<>(); | ||
| for (int pos = 0; pos < arrayTwo.size(); pos++) { | ||
| final Object element = elementGetter.getElementOrNull(arrayTwo, pos); | ||
| final ObjectContainer objectContainer = createObjectContainer(element); | ||
| map.merge(objectContainer, 1, (k, v) -> v + 1); | ||
| } | ||
| for (int pos = 0; pos < arrayOne.size(); pos++) { | ||
| final Object element = elementGetter.getElementOrNull(arrayOne, pos); | ||
| final ObjectContainer objectContainer = createObjectContainer(element); | ||
| if (map.containsKey(objectContainer)) { | ||
| map.compute(objectContainer, (k, v) -> v == null || v == 1 ? null : v - 1); | ||
| } else { | ||
| list.add(element); | ||
| } | ||
| } | ||
| return new GenericArrayData(list.toArray()); | ||
| } catch (Throwable t) { | ||
| throw new FlinkRuntimeException(t); | ||
| } | ||
| } | ||
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| private ObjectContainer createObjectContainer(Object element) { | ||
| if (element == null) { | ||
| return null; | ||
| } | ||
| return new ObjectContainer( | ||
| element, | ||
| equalityAndHashcodeProvider::equals, | ||
| equalityAndHashcodeProvider::hashCode); | ||
| } | ||
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| @Override | ||
| public void close() throws Exception { | ||
| equalityAndHashcodeProvider.close(); | ||
| } | ||
| } |
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