presto-orc/src/main/java/io/prestosql/orc/metadata/statistics/BloomFilter.java/BloomFilter/addHash
class BloomFilter:    private void addHash(long hash64)
    {
        int hash1 = (int) hash64;
        int hash2 = (int) (hash64 >>> 32);

        for (int i = 1; i <= numHashFunctions; i++) {
            int combinedHash = hash1 + (i * hash2);
            // hashcode should be positive, flip all the bits if it's negative
            if (combinedHash < 0) {
                combinedHash = ~combinedHash;
            }
            int pos = combinedHash % numBits;
            bitSet.set(pos);
        }
    }