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Posted to dev@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2013/12/13 00:33:07 UTC

[jira] [Updated] (HIVE-6027) non-vectorized log10 has rounding issue

     [ https://issues.apache.org/jira/browse/HIVE-6027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Shelukhin updated HIVE-6027:
-----------------------------------

    Attachment: HIVE-6027.patch

trivial patch

> non-vectorized log10 has rounding issue
> ---------------------------------------
>
>                 Key: HIVE-6027
>                 URL: https://issues.apache.org/jira/browse/HIVE-6027
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Trivial
>         Attachments: HIVE-6027.patch
>
>
> In HIVE-6010, I found that vectorized and non-vectorized log10 may produce different results in the last digit of the mantissa (e.g. 7 vs 8). It turns out that vectorized one uses Math.log10, but non-vectorized uses log/log(10). Both should use Math.log10.



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