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[FLINK-27891][Table] Add ARRAY_APPEND and ARRAY_PREPEND functions
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55 changes: 55 additions & 0 deletions
55
...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 +1,55 @@ | ||
| /* | ||
| * 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.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 if it's not nullable or element to add is not nullable, otherwise it | ||
| * returns {@link DataTypes#ARRAY(DataType)} with type equal to the type of the element to add to | ||
| * array. | ||
| */ | ||
| @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); | ||
| final LogicalType arrayElementLogicalType = | ||
| arrayDataType.getLogicalType().getChildren().get(0); | ||
| if (elementToAddDataType.getLogicalType().isNullable() | ||
| && !arrayElementLogicalType.isNullable()) { | ||
| return Optional.of( | ||
| DataTypes.ARRAY(fromLogicalToDataType(arrayElementLogicalType).nullable())); | ||
| } | ||
| return Optional.of(arrayDataType); | ||
| } | ||
| } |
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56 changes: 56 additions & 0 deletions
56
...org/apache/flink/table/types/inference/strategies/ArrayAppendPrependTypeStrategyTest.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.types.inference.strategies; | ||
|
|
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| import org.apache.flink.table.api.DataTypes; | ||
| import org.apache.flink.table.types.inference.TypeStrategiesTestBase; | ||
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| import java.util.stream.Stream; | ||
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| /** Tests for {@link ArrayAppendPrependTypeStrategy}. */ | ||
| public class ArrayAppendPrependTypeStrategyTest extends TypeStrategiesTestBase { | ||
| @Override | ||
| protected Stream<TestSpec> testData() { | ||
| return Stream.of( | ||
| TestSpec.forStrategy( | ||
| "Array element is nullable, element to add is nullable", | ||
| SpecificTypeStrategies.ARRAY_APPEND_PREPEND) | ||
| .inputTypes(DataTypes.ARRAY(DataTypes.BIGINT()), DataTypes.BIGINT()) | ||
| .expectDataType(DataTypes.ARRAY(DataTypes.BIGINT())), | ||
| TestSpec.forStrategy( | ||
| "Array element type is non null, element to add is nullable", | ||
| SpecificTypeStrategies.ARRAY_APPEND_PREPEND) | ||
| .inputTypes( | ||
| DataTypes.ARRAY(DataTypes.BIGINT().notNull()), DataTypes.BIGINT()) | ||
| .expectDataType(DataTypes.ARRAY(DataTypes.BIGINT())), | ||
| TestSpec.forStrategy( | ||
| "Array element type is nullable, element to add is non null", | ||
| SpecificTypeStrategies.ARRAY_APPEND_PREPEND) | ||
| .inputTypes( | ||
| DataTypes.ARRAY(DataTypes.BIGINT()), DataTypes.BIGINT().notNull()) | ||
| .expectDataType(DataTypes.ARRAY(DataTypes.BIGINT())), | ||
| TestSpec.forStrategy( | ||
| "Array element type is non null, element to add is non null", | ||
| SpecificTypeStrategies.ARRAY_APPEND_PREPEND) | ||
| .inputTypes( | ||
| DataTypes.ARRAY(DataTypes.BIGINT().notNull()), | ||
| DataTypes.BIGINT().notNull()) | ||
| .expectDataType(DataTypes.ARRAY(DataTypes.BIGINT().notNull()))); | ||
| } | ||
| } |
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