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Posted to dev@datafu.apache.org by "Matthew Hayes (JIRA)" <ji...@apache.org> on 2015/10/21 19:25:27 UTC

[jira] [Created] (DATAFU-101) Consider additional cardinality estimators

Matthew Hayes created DATAFU-101:
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             Summary: Consider additional cardinality estimators
                 Key: DATAFU-101
                 URL: https://issues.apache.org/jira/browse/DATAFU-101
             Project: DataFu
          Issue Type: Improvement
            Reporter: Matthew Hayes


We wrapped HyperLogLogPlus from the stream library:

https://github.com/addthis/stream-lib/tree/master/src/main/java/com/clearspring/analytics/stream/cardinality

There are some new classes that look interesting.  CountThenEstimate for example does an exact count and switches to an estimator once a threshold has been reached.



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