presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/Murmur3PartitionerTokenRing.java/Murmur3PartitionerTokenRing/getRingFraction
class Murmur3PartitionerTokenRing:    @Override
    public double getRingFraction(String start, String end)
    {
        return getTokenCountInRange(start, end).doubleValue() / TOTAL_TOKEN_COUNT.doubleValue();
    }