mirror of https://github.com/apache/lucene.git
SOLR-11789: Add integrate Stream Evaluator
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@ -284,6 +284,7 @@ public class StreamHandler extends RequestHandlerBase implements SolrCoreAware,
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.withFunctionName("ttest", TTestEvaluator.class)
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.withFunctionName("pairedTtest", PairedTTestEvaluator.class)
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.withFunctionName("multiVariateNormalDistribution", MultiVariateNormalDistributionEvaluator.class)
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.withFunctionName("integrate", IntegrateEvaluator.class)
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// Boolean Stream Evaluators
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@ -0,0 +1,70 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.solr.client.solrj.io.eval;
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import java.io.IOException;
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import java.util.Locale;
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import org.apache.commons.math3.analysis.UnivariateFunction;
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import org.apache.commons.math3.analysis.integration.RombergIntegrator;
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import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
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import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
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public class IntegrateEvaluator extends RecursiveObjectEvaluator implements ManyValueWorker {
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protected static final long serialVersionUID = 1L;
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public IntegrateEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{
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super(expression, factory);
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}
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@Override
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public Object doWork(Object... values) throws IOException {
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if(values.length != 3) {
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throw new IOException("The integrate function requires 3 parameters");
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}
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if (!(values[0] instanceof VectorFunction)) {
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throw new IOException(String.format(Locale.ROOT, "Invalid expression %s - found type %s for the first value, expecting a FunctionVector", toExpression(constructingFactory), values[0].getClass().getSimpleName()));
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}
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VectorFunction vectorFunction = (VectorFunction) values[0];
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if(!(vectorFunction.getFunction() instanceof UnivariateFunction)) {
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throw new IOException("Cannot evaluate integral from parameter.");
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}
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Number min = null;
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Number max = null;
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if(values[1] instanceof Number) {
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min = (Number) values[1];
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} else {
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throw new IOException("The second parameter of the integrate function must be a number");
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}
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if(values[2] instanceof Number ) {
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max = (Number) values[2];
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} else {
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throw new IOException("The third parameter of the integrate function must be a number");
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}
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UnivariateFunction func = (UnivariateFunction)vectorFunction.getFunction();
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RombergIntegrator rombergIntegrator = new RombergIntegrator();
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return rombergIntegrator.integrate(5000, func, min.doubleValue(), max.doubleValue());
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}
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}
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@ -7227,6 +7227,32 @@ public class StreamExpressionTest extends SolrCloudTestCase {
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}
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@Test
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public void testIntegrate() throws Exception {
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String cexpr = "let(echo=true, " +
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"a=sequence(50, 1, 0), " +
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"b=spline(a), " +
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"c=integrate(b, 0, 49), " +
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"d=integrate(b, 0, 20), " +
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"e=integrate(b, 20, 49))";
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ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
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paramsLoc.set("expr", cexpr);
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paramsLoc.set("qt", "/stream");
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String url = cluster.getJettySolrRunners().get(0).getBaseUrl().toString()+"/"+COLLECTIONORALIAS;
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TupleStream solrStream = new SolrStream(url, paramsLoc);
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StreamContext context = new StreamContext();
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solrStream.setStreamContext(context);
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List<Tuple> tuples = getTuples(solrStream);
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assertTrue(tuples.size() == 1);
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Number integral = (Number)tuples.get(0).get("c");
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assertEquals(integral.doubleValue(), 49, 0.0);
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integral = (Number)tuples.get(0).get("d");
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assertEquals(integral.doubleValue(), 20, 0.0);
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integral = (Number)tuples.get(0).get("e");
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assertEquals(integral.doubleValue(), 29, 0.0);
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}
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@Test
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public void testLoess() throws Exception {
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String cexpr = "let(echo=true," +
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