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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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/* | ||
* 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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/* | ||
* 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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