presto-main/src/main/java/io/prestosql/operator/aggregation/state/LongDecimalWithOverflowStateFactory.java/GroupedLongDecimalWithOverflowState/ensureCapacity
class GroupedLongDecimalWithOverflowState:        @Override
        public void ensureCapacity(long size)
        {
            unscaledDecimals.ensureCapacity(size);
            overflows.ensureCapacity(size);
        }