pub fn pair_of(left: u64, right: u64) -> u64Expand description
The same pair hash for two values whose hashes are already known.
Testing every pair of a 105 column table is 5,460 pairs, and hashing the two values again for
each of them would hash every value of every column 104 times over. Hashing each column once a
row and combining the results here is the same answer for a hundredth of the work, and it is the
only way a pass over hits that tests all the pairs finishes in an afternoon.