SOLR-11350: Add primes Stream Evaluator

solr/core/src/java/org/apache/solr/handler/StreamHandler.java

@@ -296,6 +296,7 @@ public class StreamHandler extends RequestHandlerBase implements SolrCoreAware,
         .withFunctionName("probability", ProbabilityEvaluator.class)
         .withFunctionName("sumDifference", SumDifferenceEvaluator.class)
         .withFunctionName("meanDifference", MeanDifferenceEvaluator.class)
+        .withFunctionName("primes", PrimesEvaluator.class)
 
         // Boolean Stream Evaluators
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/PrimesEvaluator.java

@@ -0,0 +1,58 @@
+/*
+ * 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.solr.client.solrj.io.eval;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+import org.apache.commons.math3.primes.Primes;
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+
+public class PrimesEvaluator extends RecursiveNumericEvaluator implements ManyValueWorker {
+  protected static final long serialVersionUID = 1L;
+
+  public PrimesEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{
+    super(expression, factory);
+
+    if(2 != containedEvaluators.size()){
+      throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting two values but found %d",expression, containedEvaluators.size()));
+    }
+  }
+
+  @Override
+  public Object doWork(Object... values) throws IOException {
+    if(2 != values.length){
+      throw new IOException(String.format(Locale.ROOT,"%s(...) only works with 2 values but %d were provided", constructingFactory.getFunctionName(getClass()), values.length));
+    }
+
+    int sizeNum = ((Number)values[0]).intValue();
+    int startNum = ((Number)values[1]).intValue();
+    List<Number> primes = new ArrayList();
+
+    for(int i=0; i< sizeNum; i++) {
+      int prime = Primes.nextPrime(startNum);
+      primes.add(prime);
+      startNum = prime;
+      ++startNum;
+    }
+
+    return primes;
+  }
+}

solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/StreamExpressionTest.java

@@ -5857,6 +5857,35 @@ public class StreamExpressionTest extends SolrCloudTestCase {
   }
 
 
+  @Test
+  public void testPrimes() throws Exception {
+    String cexpr = "primes(10, 0)";
+    ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
+    paramsLoc.set("expr", cexpr);
+    paramsLoc.set("qt", "/stream");
+
+    String url = cluster.getJettySolrRunners().get(0).getBaseUrl().toString()+"/"+COLLECTIONORALIAS;
+    TupleStream solrStream = new SolrStream(url, paramsLoc);
+
+    StreamContext context = new StreamContext();
+    solrStream.setStreamContext(context);
+    List<Tuple> tuples = getTuples(solrStream);
+    assertTrue(tuples.size() == 1);
+    Tuple tuple = tuples.get(0);
+    List<Number> asort = (List<Number>)tuple.get("return-value");
+    assertEquals(asort.size(), 10);
+    assertEquals(asort.get(0).intValue(), 2);
+    assertEquals(asort.get(1).intValue(), 3);
+    assertEquals(asort.get(2).intValue(), 5);
+    assertEquals(asort.get(3).intValue(), 7);
+    assertEquals(asort.get(4).intValue(), 11);
+    assertEquals(asort.get(5).intValue(), 13);
+    assertEquals(asort.get(6).intValue(), 17);
+    assertEquals(asort.get(7).intValue(), 19);
+    assertEquals(asort.get(8).intValue(), 23);
+    assertEquals(asort.get(9).intValue(), 29);
+  }
+
   @Test
   public void testAscend() throws Exception {
     String cexpr = "asc(array(11.5, 12.3, 4, 3, 1, 0))";