presto-main/src/main/java/io/prestosql/operator/aggregation/state/DigestAndPercentileArrayStateFactory.java/GroupedDigestAndPercentileArrayState/getPercentiles
class GroupedDigestAndPercentileArrayState:        @Override
        public List<Double> getPercentiles()
        {
            return percentilesArray.get(getGroupId());
        }