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https://issues.apache.org/jira/browse/HIVE-511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12712337#action_12712337
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Raghotham Murthy commented on HIVE-511:
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I dont think this change works well for longs with the code in
UDFDefaultSampleHashFn since we just call o.hashCode(). Long.hashCode() returns
(int)(value ^ (value >>> 32)) which is not the same as what you are doing.
Notice '>>>' instead of '>>'. Also, maybe you want to change
UDFDefaultSampleHashFn to use your hashCode method as well.
> Change the hashcode for DoubleWritable
> --------------------------------------
>
> Key: HIVE-511
> URL: https://issues.apache.org/jira/browse/HIVE-511
> Project: Hadoop Hive
> Issue Type: Bug
> Reporter: Zheng Shao
> Attachments: HIVE-511.1.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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