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From "Harish Butani (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-6797) Add protection against divide by zero in stats annotation
Date Tue, 01 Apr 2014 21:33:15 GMT

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

Harish Butani updated HIVE-6797:
--------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

Committed to trunk and 0.13
thanks Prasanth.

> 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, HIVE-6797.2.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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