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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2017/11/16 05:29:00 UTC

[jira] [Created] (HIVE-18079) Statistics: Allow HyperLogLog to be merged to the lowest-common-denominator bit-size

Gopal V created HIVE-18079:
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             Summary: Statistics: Allow HyperLogLog to be merged to the lowest-common-denominator bit-size
                 Key: HIVE-18079
                 URL: https://issues.apache.org/jira/browse/HIVE-18079
             Project: Hive
          Issue Type: Improvement
            Reporter: Gopal V


HyperLogLog can merge a 14 bit HLL into a 10 bit HLL bitset, because of its mathematical hash distribution & construction.

Allow the squashing of a 14 bit HLL -> 10 bit HLL without needing a second scan over the data-set.



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