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Posted to issues@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2017/11/07 21:43:00 UTC

[jira] [Updated] (HIVE-18006) Optimize memory footprint of HLLDenseRegister

     [ https://issues.apache.org/jira/browse/HIVE-18006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Prasanth Jayachandran updated HIVE-18006:
-----------------------------------------
    Status: Patch Available  (was: Open)

> Optimize memory footprint of HLLDenseRegister
> ---------------------------------------------
>
>                 Key: HIVE-18006
>                 URL: https://issues.apache.org/jira/browse/HIVE-18006
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Prasanth Jayachandran
>            Assignee: Prasanth Jayachandran
>         Attachments: HIVE-18006.1.patch
>
>
> {code}
> private double[] invPow2Register;
> {code}
> seems to add up memory when caching column stats (#table * #partition * #cols). This register can be pre-computed and stored as constant. 



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