presto-main/src/main/java/io/prestosql/operator/aggregation/state/LongDecimalWithOverflowStateFactory.java/GroupedLongDecimalWithOverflowState/getLongDecimal
class GroupedLongDecimalWithOverflowState:        @Override
        public Slice getLongDecimal()
        {
            return unscaledDecimals.get(getGroupId());
        }