Jackie-Jiang opened a new issue #4248: Alternative HyperLogLog implementation with higher accuracy URL: https://github.com/apache/incubator-pinot/issues/4248 Current HyperLogLog implementation is fairly old: https://github.com/addthis/stream-lib/blob/master/src/main/java/com/clearspring/analytics/stream/cardinality/HyperLogLog.java There are several alternative implementations that can potentially reduce memory cost and improve accuracy. https://github.com/axiomhq/hyperloglog https://github.com/clarkduvall/hyperloglog
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