presto-main/src/main/java/io/prestosql/operator/aggregation/state/DigestAndPercentileArrayStateFactory.java/GroupedDigestAndPercentileArrayState/setPercentiles
class GroupedDigestAndPercentileArrayState:        @Override
        public void setPercentiles(List<Double> percentiles)
        {
            percentilesArray.set(getGroupId(), requireNonNull(percentiles, "percentiles is null"));
        }