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[FLINK-31663][table] Add ARRAY_EXCEPT function
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110 changes: 110 additions & 0 deletions
110
...me/src/main/java/org/apache/flink/table/runtime/functions/scalar/ArrayExceptFunction.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. | ||
| */ | ||
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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.api.DataTypes; | ||
| 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.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.lang.invoke.MethodHandle; | ||
| import java.util.ArrayList; | ||
| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
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| import static org.apache.flink.table.api.Expressions.$; | ||
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| /** Implementation of {@link BuiltInFunctionDefinitions#ARRAY_EXCEPT}. */ | ||
| @Internal | ||
| public class ArrayExceptFunction extends BuiltInScalarFunction { | ||
| private final ArrayData.ElementGetter elementGetter; | ||
| private final SpecializedFunction.ExpressionEvaluator containsEvaluator; | ||
| private transient MethodHandle containsHandle; | ||
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| public ArrayExceptFunction(SpecializedFunction.SpecializedContext context) { | ||
| super(BuiltInFunctionDefinitions.ARRAY_EXCEPT, context); | ||
| final DataType arrayElementDataType = | ||
| ((CollectionDataType) context.getCallContext().getArgumentDataTypes().get(0)) | ||
| .getElementDataType(); | ||
| final DataType arrayDataType = context.getCallContext().getArgumentDataTypes().get(0); | ||
| elementGetter = ArrayData.createElementGetter(arrayElementDataType.getLogicalType()); | ||
| containsEvaluator = | ||
| context.createEvaluator( | ||
| $("array").arrayContains($("element")), | ||
| DataTypes.BOOLEAN(), | ||
| DataTypes.FIELD("array", arrayDataType.notNull().toInternal()), | ||
| DataTypes.FIELD("element", arrayElementDataType.notNull().toInternal())); | ||
| } | ||
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| @Override | ||
| public void open(FunctionContext context) throws Exception { | ||
| containsHandle = containsEvaluator.open(context); | ||
| } | ||
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| public @Nullable ArrayData eval(ArrayData arrayOne, ArrayData arrayTwo) { | ||
| try { | ||
| if (arrayOne == null) { | ||
| return null; | ||
| } | ||
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| boolean isNullPresent = false; | ||
| if (arrayTwo != null) { | ||
| for (int pos = 0; pos < arrayTwo.size(); pos++) { | ||
| final Object element = elementGetter.getElementOrNull(arrayTwo, pos); | ||
| if (element == null) { | ||
| isNullPresent = true; | ||
| break; | ||
| } | ||
| } | ||
| } | ||
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| List<Object> list = new ArrayList(); | ||
| Set<Object> seen = new HashSet<>(); | ||
| for (int pos = 0; pos < arrayOne.size(); pos++) { | ||
| final Object element = elementGetter.getElementOrNull(arrayOne, pos); | ||
| if ((arrayTwo == null && !seen.contains(element)) | ||
| || (element == null && !isNullPresent) | ||
| || (element != null | ||
| && !seen.contains(element) | ||
| && !(boolean) containsHandle.invoke(arrayTwo, element))) { | ||
| list.add(element); | ||
| } | ||
| seen.add(element); | ||
| } | ||
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| return new GenericArrayData(list.toArray()); | ||
| } catch (Throwable t) { | ||
| throw new FlinkRuntimeException(t); | ||
| } | ||
| } | ||
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| @Override | ||
| public void close() throws Exception { | ||
| containsEvaluator.close(); | ||
| } | ||
| } |