src/test/java/com/yahoo/sketches/hive/tuple/ArrayOfDoublesSketchesTTestUDFTest.java

/*
 * Copyright 2017, Yahoo! 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.tuple;

import java.util.List;

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

import com.yahoo.sketches.tuple.ArrayOfDoublesUpdatableSketch;
import com.yahoo.sketches.tuple.ArrayOfDoublesUpdatableSketchBuilder;

@SuppressWarnings("javadoc")
public class ArrayOfDoublesSketchesTTestUDFTest {

  @Test
  public void nullSketches() {
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(null, null);
    Assert.assertNull(result);
  }

  @Test
  public void nullSketchA() {
    ArrayOfDoublesUpdatableSketch sketchB = new ArrayOfDoublesUpdatableSketchBuilder().build();
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      null,
      new BytesWritable(sketchB.compact().toByteArray())
    );
    Assert.assertNull(result);
  }

  @Test
  public void nullSketchB() {
    ArrayOfDoublesUpdatableSketch sketchA = new ArrayOfDoublesUpdatableSketchBuilder().build();
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      new BytesWritable(sketchA.compact().toByteArray()),
      null
    );
    Assert.assertNull(result);
  }

  @Test
  public void emptySketchA() {
    ArrayOfDoublesUpdatableSketch sketchA = new ArrayOfDoublesUpdatableSketchBuilder().build();
    ArrayOfDoublesUpdatableSketch sketchB = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchB.update(1, new double[] {1});
    sketchB.update(2, new double[] {1});
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      new BytesWritable(sketchA.compact().toByteArray()),
      new BytesWritable(sketchB.compact().toByteArray())
    );
    Assert.assertNull(result);
  }

  @Test
  public void emptySketchB() {
    ArrayOfDoublesUpdatableSketch sketchA = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchA.update(1, new double[] {1});
    sketchA.update(2, new double[] {1});
    ArrayOfDoublesUpdatableSketch sketchB = new ArrayOfDoublesUpdatableSketchBuilder().build();
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      new BytesWritable(sketchA.compact().toByteArray()),
      new BytesWritable(sketchB.compact().toByteArray())
    );
    Assert.assertNull(result);
  }

  @Test
  public void oneEntrySketchA() {
    ArrayOfDoublesUpdatableSketch sketchA = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchA.update(1, new double[] {1});
    ArrayOfDoublesUpdatableSketch sketchB = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchB.update(1, new double[] {1});
    sketchB.update(2, new double[] {1});
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      new BytesWritable(sketchA.compact().toByteArray()),
      new BytesWritable(sketchB.compact().toByteArray())
    );
    Assert.assertNull(result);
  }

  @Test
  public void oneEntrySketchB() {
    ArrayOfDoublesUpdatableSketch sketchA = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchA.update(1, new double[] {1});
    sketchA.update(2, new double[] {1});
    ArrayOfDoublesUpdatableSketch sketchB = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchB.update(1, new double[] {1});
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      new BytesWritable(sketchA.compact().toByteArray()),
      new BytesWritable(sketchB.compact().toByteArray())
    );
    Assert.assertNull(result);
  }

  @Test
  public void twoEntriesInBothSketchesNoDifference() {
    ArrayOfDoublesUpdatableSketch sketchA = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchA.update(1, new double[] {0.99});
    sketchA.update(2, new double[] {1.01});
    ArrayOfDoublesUpdatableSketch sketchB = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchB.update(1, new double[] {0.99});
    sketchB.update(2, new double[] {1.01});
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      new BytesWritable(sketchA.compact().toByteArray()),
      new BytesWritable(sketchB.compact().toByteArray())
    );
    Assert.assertNotNull(result);
    Assert.assertEquals(result.size(), 1);
    Assert.assertEquals(result.get(0), 1.0, 0.01);
  }

  @Test
  public void twoEntriesInBothSketchesLargeDifference() {
    ArrayOfDoublesUpdatableSketch sketchA = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchA.update(1, new double[] {0.99});
    sketchA.update(2, new double[] {1.01});
    ArrayOfDoublesUpdatableSketch sketchB = new ArrayOfDoublesUpdatableSketchBuilder().build();
    sketchB.update(1, new double[] {1.99});
    sketchB.update(2, new double[] {2.01});
    List<Double> result = new ArrayOfDoublesSketchesTTestUDF().evaluate(
      new BytesWritable(sketchA.compact().toByteArray()),
      new BytesWritable(sketchB.compact().toByteArray())
    );
    Assert.assertNotNull(result);
    Assert.assertEquals(result.size(), 1);
    Assert.assertEquals(result.get(0), 0.0, 0.01);
  }

}