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Redis implemented HyperLogLog as a native feature recently. Here's antirez's announcement and write-up: http://antirez.com/news/75 http://antirez.com/news/75

• jacquesm 12y ago
  That's a very nice write-up.
• joevandyk 12y ago
  Also, postgresql has HyperLogLog as an extension: http://tapoueh.org/blog/2013/02/25-postgresql-hyperloglog http://tapoueh.org/blog/2013/02/25-postgresql-hyperloglog