presto-orc/src/main/java/io/prestosql/orc/metadata/statistics/BloomFilter.java/BloomFilter/add
class BloomFilter:    public void add(byte[] val)
    {
        // We use the trick mentioned in "Less Hashing, Same Performance: Building a Better Bloom Filter"
        // by Kirsch et.al. From abstract 'only two hash functions are necessary to effectively
        // implement a Bloom filter without any loss in the asymptotic false positive probability'

        // Lets split up 64-bit hashcode into two 32-bit hash codes and employ the technique mentioned
        // in the above paper
        long hash64 = (val == null) ? NULL_HASHCODE : OrcMurmur3.hash64(val);
        addHash(hash64);
    }