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[FLINK-27891][Table] Add ARRAY_APPEND and ARRAY_PREPEND functions
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32 changes: 32 additions & 0 deletions
32
...ava/org/apache/flink/table/types/inference/strategies/ArrayAppendPrependTypeStrategy.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| package org.apache.flink.table.types.inference.strategies; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.table.api.DataTypes; | ||
| import org.apache.flink.table.types.DataType; | ||
| import org.apache.flink.table.types.inference.CallContext; | ||
| import org.apache.flink.table.types.inference.TypeStrategy; | ||
| import org.apache.flink.table.types.logical.LogicalType; | ||
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| import java.util.List; | ||
| import java.util.Optional; | ||
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| import static org.apache.flink.table.types.utils.TypeConversions.fromLogicalToDataType; | ||
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| /** | ||
| * Type strategy that returns a {@link DataTypes#ARRAY(DataType)} with element type equal to the | ||
| * type of the first argument. | ||
| */ | ||
| @Internal | ||
| public class ArrayAppendPrependTypeStrategy implements TypeStrategy { | ||
| @Override | ||
| public Optional<DataType> inferType(CallContext callContext) { | ||
| final List<DataType> argumentDataTypes = callContext.getArgumentDataTypes(); | ||
| final DataType arrayDataType = argumentDataTypes.get(0); | ||
| final DataType elementToAddDataType = argumentDataTypes.get(1); | ||
| LogicalType logicalType = arrayDataType.getLogicalType().getChildren().get(0); | ||
| if (elementToAddDataType.getLogicalType().isNullable() && !logicalType.isNullable()) { | ||
| return Optional.of(DataTypes.ARRAY(fromLogicalToDataType(logicalType).nullable())); | ||
| } | ||
| return Optional.of(arrayDataType); | ||
| } | ||
| } |
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56 changes: 56 additions & 0 deletions
56
...me/src/main/java/org/apache/flink/table/runtime/functions/scalar/ArrayAppendFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * 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.SpecializedFunction; | ||
| import org.apache.flink.table.types.CollectionDataType; | ||
| import org.apache.flink.table.types.DataType; | ||
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| import javax.annotation.Nullable; | ||
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| /** Implementation of {@link BuiltInFunctionDefinitions#ARRAY_APPEND}. */ | ||
| @Internal | ||
| public class ArrayAppendFunction extends BuiltInScalarFunction { | ||
| private final ArrayData.ElementGetter elementGetter; | ||
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| public ArrayAppendFunction(SpecializedFunction.SpecializedContext context) { | ||
| super(BuiltInFunctionDefinitions.ARRAY_APPEND, context); | ||
| final DataType dataType = | ||
| ((CollectionDataType) context.getCallContext().getArgumentDataTypes().get(0)) | ||
| .getElementDataType(); | ||
| elementGetter = ArrayData.createElementGetter(dataType.getLogicalType()); | ||
| } | ||
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| public @Nullable ArrayData eval(ArrayData haystack, Object element) { | ||
| if (haystack == null) { | ||
| return null; | ||
| } | ||
| final int size = haystack.size(); | ||
| final Object[] data = new Object[size + 1]; | ||
| for (int pos = 0; pos < size; pos++) { | ||
| data[pos] = elementGetter.getElementOrNull(haystack, pos); | ||
| } | ||
| data[size] = element; | ||
| return new GenericArrayData(data); | ||
| } | ||
| } |
56 changes: 56 additions & 0 deletions
56
...e/src/main/java/org/apache/flink/table/runtime/functions/scalar/ArrayPrependFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * 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.SpecializedFunction; | ||
| import org.apache.flink.table.types.CollectionDataType; | ||
| import org.apache.flink.table.types.DataType; | ||
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| import javax.annotation.Nullable; | ||
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| /** Implementation of {@link BuiltInFunctionDefinitions#ARRAY_PREPEND}. */ | ||
| @Internal | ||
| public class ArrayPrependFunction extends BuiltInScalarFunction { | ||
| private final ArrayData.ElementGetter elementGetter; | ||
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| public ArrayPrependFunction(SpecializedFunction.SpecializedContext context) { | ||
| super(BuiltInFunctionDefinitions.ARRAY_APPEND, context); | ||
| final DataType dataType = | ||
| ((CollectionDataType) context.getCallContext().getArgumentDataTypes().get(0)) | ||
| .getElementDataType(); | ||
| elementGetter = ArrayData.createElementGetter(dataType.getLogicalType()); | ||
| } | ||
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| public @Nullable ArrayData eval(ArrayData haystack, Object element) { | ||
| if (haystack == null) { | ||
| return null; | ||
| } | ||
| final int size = haystack.size(); | ||
| final Object[] data = new Object[size + 1]; | ||
| data[0] = element; | ||
| for (int pos = 0; pos < size; pos++) { | ||
| data[pos + 1] = elementGetter.getElementOrNull(haystack, pos); | ||
| } | ||
| return new GenericArrayData(data); | ||
| } | ||
| } |