cmSketch not benefitting from four rows

Issues
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12

ben-manes commented :

Using @thomasmueller’s idea of adding the seed, I adapted my sketch indexing function slightly. This variation ensures that a zero, a multitive constant, doesn’t result in the same array indexes across all rows. The balance of cost versus quality of the mixing function followed by per-row seeded indexing has been pretty great in my experience.

int indexOf(int item, int i) {
  long hash = (item + SEED[i]) * SEED[i];
  hash += (hash >>> 32);
  return ((int) hash) & tableMask;
}