Jackie-Jiang commented on a change in pull request #3934: support abs,ceil,exp,floor,ln,log,sqrt math transform function URL: https://github.com/apache/incubator-pinot/pull/3934#discussion_r291013339
########## File path: pinot-core/src/main/java/org/apache/pinot/core/operator/transform/function/SingleParamMathTransformFunction.java ########## @@ -0,0 +1,175 @@ +/** + * 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. + */ +package org.apache.pinot.core.operator.transform.function; + +import java.util.Arrays; +import java.util.List; +import java.util.Map; + +import javax.annotation.Nonnull; +import org.apache.pinot.core.common.DataSource; +import org.apache.pinot.core.operator.blocks.ProjectionBlock; +import org.apache.pinot.core.operator.transform.TransformResultMetadata; +import org.apache.pinot.core.plan.DocIdSetPlanNode; + +/** + * A group of commonly used math transformation which has only one single parameter, + * including abs, exp, ceil, floor, sqrt. + */ +public abstract class SingleParamMathTransformFunction extends BaseTransformFunction { + private TransformFunction _transformFunction; + private double[] _results; + + @Override + public abstract String getName(); + + @Override + public void init(@Nonnull List<TransformFunction> arguments, @Nonnull Map<String, DataSource> dataSourceMap) { + // Check that there are exactly 1 arguments + if (arguments.size() != 1) { + throw new IllegalArgumentException("Exactly 1 arguments are required for " + getName() + " transform function"); + } + + TransformFunction firstArgument = arguments.get(0); + if (firstArgument instanceof LiteralTransformFunction) { + throw new IllegalArgumentException("Argument of " + getName() + " should not be literal"); + } else { + if (!firstArgument.getResultMetadata().isSingleValue()) { + throw new IllegalArgumentException("First argument of " + getName() + " transform function must be single-valued"); + } + _transformFunction = firstArgument; + } + } + + @Override + public TransformResultMetadata getResultMetadata() { + return DOUBLE_SV_NO_DICTIONARY_METADATA; + } + + @SuppressWarnings("Duplicates") + @Override + public double[] transformToDoubleValuesSV(@Nonnull ProjectionBlock projectionBlock) { + if (_results == null) { + _results = new double[DocIdSetPlanNode.MAX_DOC_PER_CALL]; + } + + int length = projectionBlock.getNumDocs(); + + if (_transformFunction == null) { + Arrays.fill(_results, 0, length, 0); + } else { + switch (_transformFunction.getResultMetadata().getDataType()) { + case INT: + case LONG: + case FLOAT: + case DOUBLE: + double[] doubleValues = _transformFunction.transformToDoubleValuesSV(projectionBlock); + applyMathOperator(_results, doubleValues, length); + break; + default: + throw new UnsupportedOperationException(); + } + } + + return _results; + } + + abstract protected void applyMathOperator(double[] result, double[] values, int length); + + public static class AbsTransformFunction extends SingleParamMathTransformFunction { + public static final String FUNCTION_NAME = "abs"; + + @Override + public String getName() { + return FUNCTION_NAME; + } + + @Override + protected void applyMathOperator(double[] result, double[] values, int length) { + for (int i = 0; i < length; i++) { + result[i] = Math.abs(values[i]); + } + } + } + + public static class CeilTransformFunction extends SingleParamMathTransformFunction { + public static final String FUNCTION_NAME = "ceil"; + + @Override + public String getName() { + return FUNCTION_NAME; + } + + @Override + protected void applyMathOperator(double[] result, double[] values, int length) { + for (int i = 0; i < length; i++) { + result[i] = Math.ceil(values[i]); + } + } + } + + public static class ExpTransformFunction extends SingleParamMathTransformFunction { + public static final String FUNCTION_NAME = "exp"; + + @Override + public String getName() { + return FUNCTION_NAME; + } + + @Override + protected void applyMathOperator(double[] result, double[] values, int length) { + for (int i = 0; i < length; i++) { + result[i] = Math.exp(values[i]); + } + } + } + + public static class FloorTransformFunction extends SingleParamMathTransformFunction { + public static final String FUNCTION_NAME = "floor"; + + @Override + public String getName() { + return FUNCTION_NAME; + } + + @Override + protected void applyMathOperator(double[] result, double[] values, int length) { + for (int i = 0; i < length; i++) { + result[i] = Math.floor(values[i]); + } + } + } + + public static class SqrtTransformFunction extends SingleParamMathTransformFunction { + public static final String FUNCTION_NAME = "sqrt"; + + @Override + public String getName() { + return FUNCTION_NAME; + } + + @Override + protected void applyMathOperator(double[] result, double[] values, int length) { + for (int i = 0; i < length; i++) { + result[i] = Math.sqrt(values[i]); + } + } + } + Review comment: (nit) extra empty line ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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