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https://issues.apache.org/jira/browse/HIVE-8017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14127184#comment-14127184
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Xuefu Zhang commented on HIVE-8017:
-----------------------------------
{quote}
For union_remove_25.q, the only diff is the total size of outputTbl2 (6812 ->
6826). I checked the MR version and the total size is also 6812. I'm not sure
what causes this difference.
{quote}
I have no clue either, but I had the same observation before. Nevertheless,
this should be okay since the output data matches. It doesn't seem worth the
time to drill down, at least for now.
> Use HiveKey instead of BytesWritable as key type of the pair RDD [Spark
> Branch]
> -------------------------------------------------------------------------------
>
> Key: HIVE-8017
> URL: https://issues.apache.org/jira/browse/HIVE-8017
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Rui Li
> Assignee: Rui Li
> Attachments: HIVE-8017-spark.patch, HIVE-8017.2-spark.patch
>
>
> HiveKey should be used as the key type because it holds the hash code for
> partitioning. While BytesWritable serves partitioning well for simple cases,
> we have to use {{HiveKey.hashCode}} for more complicated ones, e.g. join,
> bucketed table, etc.
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