src/test/java/org/apache/datasketches/hive/kll/GetQuantilesUDFTest.java

/*
 * 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
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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package org.apache.datasketches.hive.kll;

import java.util.List;

import org.apache.hadoop.io.BytesWritable;
import org.testng.Assert;
import org.testng.annotations.Test;

import org.apache.datasketches.kll.KllFloatsSketch;

@SuppressWarnings("javadoc")
public class GetQuantilesUDFTest {

  @Test
  public void nullSketch() {
    final List<Float> result = new GetQuantilesUDF().evaluate(null, 0.0);
    Assert.assertNull(result);
  }

  @Test
  public void emptyListOfFractions() {
    final KllFloatsSketch sketch = new KllFloatsSketch();
    sketch.update(1);
    sketch.update(2);
    sketch.update(3);
    final List<Float> result = new GetQuantilesUDF().evaluate(new BytesWritable(sketch.toByteArray()));
    Assert.assertNotNull(result);
    Assert.assertEquals(result.size(), 0);
  }

  @Test
  public void fractionsNormalCase() {
    final KllFloatsSketch sketch = new KllFloatsSketch();
    sketch.update(1);
    sketch.update(2);
    sketch.update(3);
    final List<Float> result = new GetQuantilesUDF().evaluate(new BytesWritable(sketch.toByteArray()), 0.0, 0.5, 1.0);
    Assert.assertNotNull(result);
    Assert.assertEquals(result.size(), 3);
    Assert.assertEquals(result.get(0), 1f);
    Assert.assertEquals(result.get(1), 2f);
    Assert.assertEquals(result.get(2), 3f);
  }

}