/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 Metamarkets Group Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package io.druid.query.aggregation.histogram;
import io.druid.query.aggregation.TestFloatColumnSelector;
import org.junit.Assert;
import org.junit.Test;
import java.util.HashMap;
import java.util.Map;
public class ApproximateHistogramPostAggregatorTest
{
static final float[] VALUES = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
protected ApproximateHistogram buildHistogram(int size, float[] values)
{
ApproximateHistogram h = new ApproximateHistogram(size);
for (float v : values) {
h.offer(v);
}
return h;
}
@Test
public void testCompute()
{
ApproximateHistogram ah = buildHistogram(10, VALUES);
final TestFloatColumnSelector selector = new TestFloatColumnSelector(VALUES);
ApproximateHistogramAggregator agg = new ApproximateHistogramAggregator("price", selector, 10, Float.NEGATIVE_INFINITY, Float.POSITIVE_INFINITY);
for (int i = 0; i < VALUES.length; i++) {
agg.aggregate();
selector.increment();
}
Map<String, Object> metricValues = new HashMap<String, Object>();
metricValues.put(agg.getName(), agg.get());
ApproximateHistogramPostAggregator approximateHistogramPostAggregator = new EqualBucketsPostAggregator(
"approxHist",
"price",
5
);
Assert.assertEquals(ah.toHistogram(5), approximateHistogramPostAggregator.compute(metricValues));
}
}