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[FLINK-28919][table] Add built-in generate_series function.
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.../src/main/java/org/apache/flink/table/runtime/functions/table/GenerateSeriesFunction.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.table; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.table.api.DataTypes; | ||
| import org.apache.flink.table.functions.BuiltInFunctionDefinitions; | ||
| import org.apache.flink.table.functions.SpecializedFunction.SpecializedContext; | ||
| import org.apache.flink.table.types.DataType; | ||
| import org.apache.flink.table.types.logical.LogicalType; | ||
| import org.apache.flink.table.types.logical.utils.LogicalTypeMerging; | ||
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| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
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| /** | ||
| * GenerateSeries implements the table function `generate_series(start, stop)` | ||
| * `generate_series(start, * stop, step)` which generate a series of values, from start to stop with | ||
| * a step size. | ||
| */ | ||
| @Internal | ||
| public class GenerateSeriesFunction extends BuiltInTableFunction<Object> { | ||
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| private static final long serialVersionUID = 1L; | ||
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| private final transient DataType outputDataType; | ||
| private final LogicalType outputLogicalType; | ||
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| public GenerateSeriesFunction(SpecializedContext specializedContext) { | ||
| super(BuiltInFunctionDefinitions.GENERATE_SERIES, specializedContext); | ||
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| // The output type in the context is already wrapped, however, the result of the | ||
| // function is not. Therefore, we need a custom output type. | ||
| final List<LogicalType> actualTypes = | ||
| specializedContext.getCallContext().getArgumentDataTypes().stream() | ||
| .map(DataType::getLogicalType) | ||
| .collect(Collectors.toList()); | ||
| this.outputLogicalType = LogicalTypeMerging.findCommonType(actualTypes).get(); | ||
| this.outputDataType = DataTypes.of(outputLogicalType).toInternal(); | ||
| } | ||
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| @Override | ||
| public DataType getOutputDataType() { | ||
| return outputDataType; | ||
| } | ||
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| public void eval(Number start, Number stop) { | ||
| eval(start, stop, 1); | ||
| } | ||
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| public void eval(Number start, Number stop, Number step) { | ||
| if (isZero(step)) { | ||
| throw new IllegalArgumentException("step size cannot equal zero"); | ||
| } | ||
| double s = start.doubleValue(); | ||
| if (step.doubleValue() > 0) { | ||
| while (s <= stop.doubleValue()) { | ||
| collect(converter(s)); | ||
| s += step.doubleValue(); | ||
| } | ||
| } else { | ||
| while (s >= stop.doubleValue()) { | ||
| collect(converter(s)); | ||
| s += step.doubleValue(); | ||
| } | ||
| } | ||
| } | ||
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| private Object converter(double s) { | ||
| switch (outputLogicalType.getTypeRoot()) { | ||
| case TINYINT: | ||
| return Byte.valueOf((byte) s); | ||
| case SMALLINT: | ||
| return Short.valueOf((short) s); | ||
| case INTEGER: | ||
| return Integer.valueOf((int) s); | ||
| case BIGINT: | ||
| return Long.valueOf((long) s); | ||
| case FLOAT: | ||
| return Float.valueOf((float) s); | ||
| case DOUBLE: | ||
| return Double.valueOf(s); | ||
| default: | ||
| throw new UnsupportedOperationException( | ||
| "Unsupported type: " + outputLogicalType.getTypeRoot()); | ||
| } | ||
| } | ||
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| private boolean isZero(Object number) { | ||
| if (number instanceof Byte | ||
| || number instanceof Short | ||
| || number instanceof Integer | ||
| || number instanceof Long) { | ||
| return ((Long) number).compareTo(0L) == 0; | ||
| } else if (number instanceof Float) { | ||
| return ((Float) number).compareTo(0.0f) == 0; | ||
| } else if (number instanceof Double) { | ||
| return ((Double) number).compareTo(0.0d) == 0; | ||
| } else { | ||
| throw new UnsupportedOperationException("Unsupported step type: " + number.getClass()); | ||
| } | ||
| } | ||
| } |