presto-main/src/main/java/io/prestosql/operator/OperatorContext.java/OperatorContext/updateBytes
class OperatorContext:        @Override
        public void updateBytes(long bytes)
        {
            if (bytes >= 0) {
                reservedBytes.addAndGet(bytes);
                driverContext.reserveSpill(bytes);
                spilledBytes.addAndGet(bytes);
            }
            else {
                reservedBytes.accumulateAndGet(-bytes, this::decrementSpilledReservation);
                driverContext.freeSpill(-bytes);
            }
        }