Well hyperloglog is simply a golden bullet for all the time-series systems currently en vogue. "How many people with Windows 7 visited google.com yesterday?" ->

Well hyperloglog is simply a golden bullet for all the time-series systems currently en vogue. "How many people with Windows 7 visited google.com yesterday?" -> come back in a year and the query is done. "+/- 2% is ok." -> Instant answer.