src/test/java/org/apache/datasketches/hive/tuple/DoubleSummarySketchToEstimatesUDFTest.java

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 * 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
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 *
 * http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.datasketches.hive.tuple;

import java.util.List;

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

import org.apache.datasketches.tuple.UpdatableSketch;
import org.apache.datasketches.tuple.UpdatableSketchBuilder;
import org.apache.datasketches.tuple.adouble.DoubleSummary;
import org.apache.datasketches.tuple.adouble.DoubleSummaryFactory;

@SuppressWarnings("javadoc")
public class DoubleSummarySketchToEstimatesUDFTest {

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

  @Test
  public void emptySketch() {
    UpdatableSketch<Double, DoubleSummary> sketch = new UpdatableSketchBuilder<>(new DoubleSummaryFactory()).build();
    List<Double> result = new DoubleSummarySketchToEstimatesUDF().evaluate(new BytesWritable(sketch.compact().toByteArray()));
    Assert.assertNotNull(result);
    Assert.assertEquals(result.size(), 2);
    Assert.assertEquals(result.get(0), 0.0);
    Assert.assertEquals(result.get(1), 0.0);
  }

  @Test
  public void normalCase() {
    UpdatableSketch<Double, DoubleSummary> sketch = new UpdatableSketchBuilder<>(new DoubleSummaryFactory()).build();
    sketch.update(1, 1.0);
    sketch.update(2, 1.0);
    List<Double> result = new DoubleSummarySketchToEstimatesUDF().evaluate(new BytesWritable(sketch.compact().toByteArray()));
    Assert.assertNotNull(result);
    Assert.assertEquals(result.size(), 2);
    Assert.assertEquals(result.get(0), 2.0);
    Assert.assertEquals(result.get(1), 2.0);
  }

}