src/test/java/org/apache/datasketches/pig/tuple/DoubleSummarySketchToEstimatesTest.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
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.datasketches.pig.tuple;

import org.testng.annotations.Test;
import org.testng.Assert;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;

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 DoubleSummarySketchToEstimatesTest {
  @Test
  public void nullInput() throws Exception {
    EvalFunc<Tuple> func = new DoubleSummarySketchToEstimates();
    Tuple resultTuple = func.exec(null);
    Assert.assertNull(resultTuple);
  }

  @Test
  public void emptyInput() throws Exception {
    EvalFunc<Tuple> func = new DoubleSummarySketchToEstimates();
    Tuple resultTuple = func.exec(TupleFactory.getInstance().newTuple());
    Assert.assertNull(resultTuple);
  }

  @Test
  public void emptySketch() throws Exception {
    EvalFunc<Tuple> func = new DoubleSummarySketchToEstimates();
    UpdatableSketch<Double, DoubleSummary> sketch =
        new UpdatableSketchBuilder<>(new DoubleSummaryFactory(DoubleSummary.Mode.Sum)).build();
    Tuple inputTuple = PigUtil.objectsToTuple(new DataByteArray(sketch.compact().toByteArray()));
    Tuple resultTuple = func.exec(inputTuple);
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 2);
    Assert.assertEquals(resultTuple.get(0), 0.0);
    Assert.assertEquals(resultTuple.get(0), 0.0);
  }

  @Test
  public void normalCase() throws Exception {
    EvalFunc<Tuple> func = new DoubleSummarySketchToEstimates();
    UpdatableSketch<Double, DoubleSummary> sketch =
        new UpdatableSketchBuilder<>(new DoubleSummaryFactory(DoubleSummary.Mode.Sum)).build();
    int iterations = 100000;
    for (int i = 0; i < iterations; i++) {
      sketch.update(i, 1.0);
    }
    for (int i = 0; i < iterations; i++) {
      sketch.update(i, 1.0);
    }
    Tuple inputTuple = PigUtil.objectsToTuple(new DataByteArray(sketch.compact().toByteArray()));
    Tuple resultTuple = func.exec(inputTuple);
    Assert.assertNotNull(resultTuple);
    Assert.assertEquals(resultTuple.size(), 2);
    Assert.assertEquals((double) resultTuple.get(0), iterations, iterations * 0.03);
    Assert.assertEquals((double) resultTuple.get(1), 2 * iterations, 2 * iterations * 0.03);
  }
}