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https://issues.apache.org/jira/browse/HIVE-1629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908194#action_12908194
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Ning Zhang commented on HIVE-1629:
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+ long v = Double.doubleToLongBits(value);
+ return (int) (v ^ (v >>> 32));
won't this return 0 for all long values less than 2^32?
Search on the web and it seems the following 64 bit to 32 bit hash is a good one
http://www.cris.com/~ttwang/tech/inthash.htm
> Patch to fix hashCode method in DoubleWritable class
> ----------------------------------------------------
>
> Key: HIVE-1629
> URL: https://issues.apache.org/jira/browse/HIVE-1629
> Project: Hadoop Hive
> Issue Type: Bug
> Reporter: Vaibhav Aggarwal
> Attachments: HIVE-1629.patch
>
>
> A patch to fix the hashCode() method of DoubleWritable class of Hive.
> It prevents the HashMap (of type DoubleWritable) from behaving as LinkedList.
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