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Fix median calculation in MedianAbsoluteDeviationAggregatorTests (#38979) 

Fixes an error in median calculation in
MedianAbsoluteDeviationAggregatorTests for odd number of sample points,
which causes some rare test failures.

Fixes #38937
This commit is contained in:
Igor Motov 2019-02-19 16:02:11 -05:00
parent 90b1b36f50
commit 3d93011e32
1 changed files with 9 additions and 3 deletions
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10
server/src/test/java/org/elasticsearch/search/aggregations/metrics/MedianAbsoluteDeviationAggregatorTests.java
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@ -260,9 +260,15 @@ public class MedianAbsoluteDeviationAggregatorTests extends AggregatorTestCase {
private static double calculateMedian(double[] sample) {
final double[] sorted = Arrays.copyOf(sample, sample.length);
Arrays.sort(sorted);
final int halfway = (int) Math.ceil(sorted.length / 2d);
final double median = (sorted[halfway - 1] + sorted[halfway]) / 2d;
final double median;
if (sorted.length % 2 == 0) {
// even
median = (sorted[halfway - 1] + sorted[halfway]) / 2d;
} else {
// odd
median = (sorted[halfway - 1]);
}
return median;
}