src/test/java/com/yahoo/sketches/hive/kll/GetQuantilesUDFTest.java

/*
 * Copyright 2018, Oath Inc.
 * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms.
 */

package com.yahoo.sketches.hive.kll;

import java.util.List;

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

import com.yahoo.sketches.kll.KllFloatsSketch;

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);
  }

}