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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2017/11/16 05:29:00 UTC
[jira] [Assigned] (HIVE-18079) Statistics: Allow HyperLogLog to be
merged to the lowest-common-denominator bit-size
[ https://issues.apache.org/jira/browse/HIVE-18079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gopal V reassigned HIVE-18079:
------------------------------
Assignee: Gopal V
> 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
> Assignee: 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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