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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-18079) Statistics: Allow HyperLogLog to be merged to the lowest-common-denominator bit-size
Date Fri, 08 Jun 2018 06:28:00 GMT

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

Ashutosh Chauhan updated HIVE-18079:
------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.1.0
           Status: Resolved  (was: Patch Available)

Pushed to master and branch-3. Thanks, Gopal!

> 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
>            Priority: Major
>             Fix For: 3.1.0
>
>         Attachments: HIVE-18079-branch-3.patch, HIVE-18079-branch-3.patch, HIVE-18079-branch-3.patch,
HIVE-18079.1.patch, HIVE-18079.10.patch, HIVE-18079.11.patch, HIVE-18079.12.patch, HIVE-18079.13.patch,
HIVE-18079.14.patch, HIVE-18079.15.patch, HIVE-18079.15.patch, HIVE-18079.15.patch, HIVE-18079.16.patch,
HIVE-18079.17.patch, HIVE-18079.17.patch, HIVE-18079.18.patch, HIVE-18079.19.patch, HIVE-18079.2.patch,
HIVE-18079.20.patch, HIVE-18079.4.patch, HIVE-18079.5.patch, HIVE-18079.6.patch, HIVE-18079.7.patch,
HIVE-18079.8.patch, HIVE-18079.9.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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