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Posted to issues@orc.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2018/05/01 21:46:00 UTC

[jira] [Updated] (ORC-49) Improve decimal encoding to use RLE

     [ https://issues.apache.org/jira/browse/ORC-49?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Owen O'Malley updated ORC-49:
-----------------------------
    Fix Version/s: 1.5.0

> Improve decimal encoding to use RLE
> -----------------------------------
>
>                 Key: ORC-49
>                 URL: https://issues.apache.org/jira/browse/ORC-49
>             Project: ORC
>          Issue Type: Sub-task
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>            Priority: Major
>             Fix For: 1.5.0
>
>
> Because decimal was added in Hive 0.11 with no maximum precision, the ORC encoding for decimal uses arbitrary var ints. Since Hive 0.12, the maximum precision for decimals fits in 128 bits and thus we can use a much better encoding using the long rle.



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