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Fix sum test 

It was relying on the compensated sum working but the test framework was
dodging it. This forces the accuracy tests to come from a single shard
where we get the proper compensated sum.

Closes #56757
This commit is contained in:
Nik Everett 2020-05-15 16:07:43 -04:00
parent da833d6cd3
commit 7b626826eb
1 changed files with 16 additions and 5 deletions
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21
server/src/test/java/org/elasticsearch/search/aggregations/metrics/SumAggregatorTests.java
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@ -160,11 +160,10 @@ public class SumAggregatorTests extends AggregatorTestCase {
"Re-index with correct docvalues type.", e.getMessage());
}
@AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/56757")
public void testSummationAccuracy() throws IOException {
// Summing up a normal array and expect an accurate value
double[] values = new double[]{0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7};
verifySummationOfDoubles(values, 15.3, 0d);
verifySummationOfDoubles(values, 15.3, Double.MIN_NORMAL);
// Summing up an array which contains NaN and infinities and expect a result same as naive summation
int n = randomIntBetween(5, 10);
@ -197,9 +196,21 @@ public class SumAggregatorTests extends AggregatorTestCase {
sum("_name").field(FIELD_NAME),
new MatchAllDocsQuery(),
iw -> {
for (double value : values) {
iw.addDocument(singleton(new NumericDocValuesField(FIELD_NAME, NumericUtils.doubleToSortableLong(value))));
}
/*
* The sum agg uses a Kahan sumation on the shard to limit
* floating point errors. But it doesn't ship the sums to the
* coordinating node, so floaing point error can creep in when
* reducing many sums. The test framework aggregates each
* segment as though it were a separate shard, then reduces
* those togther. Fun. But it means we don't get the full
* accuracy of the Kahan sumation. And *that* accuracy is
* what this method is trying to test. So we have to stick
* all the documents on the same leaf. `addDocuments` does
* that.
*/
iw.addDocuments(Arrays.stream(values).mapToObj(value ->
singleton(new NumericDocValuesField(FIELD_NAME, NumericUtils.doubleToSortableLong(value)))
).collect(toList()));
},
result -> assertEquals(expected, result.getValue(), delta),
defaultFieldType(NumberType.DOUBLE)