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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-511) Change the hashcode for DoubleWritable
Date Wed, 27 May 2009 21:41:45 GMT

    [ https://issues.apache.org/jira/browse/HIVE-511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713761#action_12713761
] 

Zheng Shao commented on HIVE-511:
---------------------------------

Sorry I should have put a comment.
We are using http://java.sun.com/j2se/1.4.2/docs/api/java/util/List.html#hashCode() here.


> Change the hashcode for DoubleWritable
> --------------------------------------
>
>                 Key: HIVE-511
>                 URL: https://issues.apache.org/jira/browse/HIVE-511
>             Project: Hadoop Hive
>          Issue Type: Bug
>    Affects Versions: 0.4.0
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>             Fix For: 0.4.0
>
>         Attachments: HIVE-511.1.patch, HIVE-511.2.patch
>
>
> The current DoubleWritable hashCode takes only the last 32 bits. This is a big problem
because for small integer values like 1.0, 2.0, 15.0, the hashCode are all 0.

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