presto-main/src/main/java/io/prestosql/operator/aggregation/state/DigestAndPercentileArrayStateFactory.java/GroupedDigestAndPercentileArrayState/getEstimatedSize
class GroupedDigestAndPercentileArrayState:        @Override
        public long getEstimatedSize()
        {
            return INSTANCE_SIZE + size + digests.sizeOf() + percentilesArray.sizeOf();
        }