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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-18079) Statistics: Allow HyperLogLog to be merged to the lowest-common-denominator bit-size
Date Wed, 03 Jan 2018 09:01:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-18079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HIVE-18079:
---------------------------
    Attachment: HIVE-18079.6.patch

> 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
>          Components: Standalone Metastore, Statistics
>    Affects Versions: 3.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: HIVE-18079.1.patch, HIVE-18079.2.patch, HIVE-18079.4.patch, HIVE-18079.5.patch,
HIVE-18079.6.patch
>
>
> 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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