spark/sql/JavaUDAFSuite.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package test.org.apache.spark.sql;
0019
0020 import org.apache.spark.sql.Row;
0021 import org.apache.spark.sql.SparkSession;
0022 import org.junit.After;
0023 import org.junit.Assert;
0024 import org.junit.Before;
0025 import org.junit.Test;
0026
0027
0028 public class JavaUDAFSuite {
0029
0030   private transient SparkSession spark;
0031
0032   @Before
0033   public void setUp() {
0034     spark = SparkSession.builder()
0035         .master("local[*]")
0036         .appName("testing")
0037         .getOrCreate();
0038   }
0039
0040   @After
0041   public void tearDown() {
0042     spark.stop();
0043     spark = null;
0044   }
0045
0046   @SuppressWarnings("unchecked")
0047   @Test
0048   public void udf1Test() {
0049     spark.range(1, 10).toDF("value").createOrReplaceTempView("df");
0050     spark.udf().registerJavaUDAF("myDoubleAvg", MyDoubleAvg.class.getName());
0051     Row result = spark.sql("SELECT myDoubleAvg(value) as my_avg from df").head();
0052     Assert.assertEquals(105.0, result.getDouble(0), 1.0e-6);
0053   }
0054
0055 }