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implemented scalar function log(x), log(b,x) and ln(x)
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185 changes: 185 additions & 0 deletions
185
sql/src/main/java/io/crate/operation/scalar/arithmetic/LogFunction.java
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| /* | ||
| * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with this work for | ||
| * additional information regarding copyright ownership. Crate 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. | ||
| * | ||
| * However, if you have executed another commercial license agreement | ||
| * with Crate these terms will supersede the license and you may use the | ||
| * software solely pursuant to the terms of the relevant commercial agreement. | ||
| */ | ||
|
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| package io.crate.operation.scalar.arithmetic; | ||
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| import io.crate.metadata.FunctionIdent; | ||
| import io.crate.metadata.FunctionInfo; | ||
| import io.crate.metadata.Scalar; | ||
| import io.crate.operation.Input; | ||
| import io.crate.operation.scalar.ScalarFunctionModule; | ||
| import io.crate.planner.symbol.Function; | ||
| import io.crate.planner.symbol.Literal; | ||
| import io.crate.planner.symbol.Symbol; | ||
| import io.crate.types.DataType; | ||
| import io.crate.types.DataTypes; | ||
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| import java.util.Arrays; | ||
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| public abstract class LogFunction implements Scalar<Number,Number> { | ||
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| public static final String NAME = "log"; | ||
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| protected final FunctionInfo info; | ||
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| public static void register(ScalarFunctionModule module) { | ||
| LogBaseFunction.registerLogBaseFunctions(module); | ||
| Log10Function.registerLog10Functions(module); | ||
| LnFunction.registerLnFunctions(module); | ||
| } | ||
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| @Override | ||
| public FunctionInfo info() { | ||
| return info; | ||
| } | ||
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| /** | ||
| * @param result | ||
| * @param caller used in the error message for clarification purposes. | ||
| * @return | ||
| */ | ||
| protected Double validateResult(Double result, String caller) { | ||
| if (result == null) { | ||
| return null; | ||
| } | ||
| if (Double.isNaN(result) || Double.isInfinite(result)) { | ||
| throw new IllegalArgumentException(caller + ": given arguments would result in: '" + result + "'"); | ||
| } | ||
| return result; | ||
| } | ||
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| public LogFunction(FunctionInfo info) { | ||
| this.info = info; | ||
| } | ||
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| static class LogBaseFunction extends LogFunction { | ||
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| protected static void registerLogBaseFunctions(ScalarFunctionModule module) { | ||
| // log(baseType, valueType) : double | ||
| for (DataType baseType : DataTypes.NUMERIC_PRIMITIVE_TYPES) { | ||
| for (DataType valueType : DataTypes.NUMERIC_PRIMITIVE_TYPES) { | ||
| FunctionInfo info = new FunctionInfo( | ||
| new FunctionIdent( | ||
| NAME, | ||
| Arrays.asList(baseType, valueType) | ||
| ), | ||
| DataTypes.DOUBLE | ||
| ); | ||
| module.register(new LogBaseFunction(info)); | ||
| } | ||
| } | ||
| } | ||
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| public LogBaseFunction(FunctionInfo info) { | ||
| super(info); | ||
| } | ||
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| @Override | ||
| public Symbol normalizeSymbol(Function symbol) { | ||
| assert (symbol.arguments().size() == 2); | ||
| Symbol base = symbol.arguments().get(0); | ||
| Symbol value = symbol.arguments().get(1); | ||
| if (value.symbolType().isValueSymbol() && base.symbolType().isValueSymbol()) { | ||
| return Literal.newLiteral(info.returnType(), evaluate((Input) base, (Input) value)); | ||
| } | ||
| return symbol; | ||
| } | ||
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| @Override | ||
| public Number evaluate(Input<Number>... args) { | ||
| assert args.length == 2; | ||
| if (args[0].value() == null || args[1].value() == null) { | ||
| return null; | ||
| } | ||
| double base = args[0].value().doubleValue(); | ||
| double value = args[1].value().doubleValue(); | ||
| double baseResult = Math.log(base); | ||
| if (baseResult == 0) { | ||
| throw new IllegalArgumentException("log(b, x): given 'base' would result in a division by zero."); | ||
| } | ||
| return validateResult(Math.log(value) / baseResult, "log(b, x)"); | ||
| } | ||
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| } | ||
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| static class Log10Function extends LogFunction { | ||
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| protected static void registerLog10Functions(ScalarFunctionModule module) { | ||
| // log(dataType) : double | ||
| for (DataType dt : DataTypes.NUMERIC_PRIMITIVE_TYPES) { | ||
| FunctionInfo info = new FunctionInfo(new FunctionIdent(NAME, Arrays.asList(dt)), DataTypes.DOUBLE); | ||
| module.register(new Log10Function(info)); | ||
| } | ||
| } | ||
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| public Log10Function(FunctionInfo info) { | ||
| super(info); | ||
| } | ||
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| @Override | ||
| public Symbol normalizeSymbol(Function symbol) { | ||
| assert (symbol.arguments().size() == 1); | ||
| Symbol value = symbol.arguments().get(0); | ||
| if (value.symbolType().isValueSymbol()) { | ||
| return Literal.newLiteral(info.returnType(), evaluate((Input)value)); | ||
| } | ||
| return symbol; | ||
| } | ||
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| @Override | ||
| public Number evaluate(Input<Number>... args) { | ||
| assert args.length == 1; | ||
| if (args[0].value() == null) { | ||
| return null; | ||
| } | ||
| double value = args[0].value().doubleValue(); | ||
| return evaluate(value); | ||
| } | ||
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| protected Double evaluate(double value) { | ||
| return validateResult(Math.log10(value), "log(x)"); | ||
| } | ||
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| } | ||
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| public static class LnFunction extends Log10Function { | ||
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| protected static void registerLnFunctions(ScalarFunctionModule module) { | ||
| // ln(dataType) : double | ||
| for (DataType dt : DataTypes.NUMERIC_PRIMITIVE_TYPES) { | ||
| FunctionInfo info = new FunctionInfo(new FunctionIdent(LnFunction.NAME, Arrays.asList(dt)), DataTypes.DOUBLE); | ||
| module.register(new LnFunction(info)); | ||
| } | ||
| } | ||
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| public static final String NAME = "ln"; | ||
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| public LnFunction(FunctionInfo info) { | ||
| super(info); | ||
| } | ||
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| @Override | ||
| protected Double evaluate(double value) { | ||
| return validateResult(Math.log(value), "ln(x)"); | ||
| } | ||
| } | ||
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| } |
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