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Posted to dev@hive.apache.org by "Prasanth J (JIRA)" <ji...@apache.org> on 2014/04/01 01:23:16 UTC

[jira] [Updated] (HIVE-6797) Add protection against divide by zero in stats annotation

     [ https://issues.apache.org/jira/browse/HIVE-6797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Prasanth J updated HIVE-6797:
-----------------------------

    Status: Patch Available  (was: Open)

> Add protection against divide by zero in stats annotation
> ---------------------------------------------------------
>
>                 Key: HIVE-6797
>                 URL: https://issues.apache.org/jira/browse/HIVE-6797
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor, Statistics
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>             Fix For: 0.13.0
>
>         Attachments: HIVE-6797.1.patch
>
>
> In stats annotation, the denominator computation in join operator is not protected for divide by zero exception. It will be an issue when NDV (count distinct) updated by updateStats() becomes 0. This patch adds protection in updateStats() method to prevent divide-by-zero in downstream operators.



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