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https://issues.apache.org/jira/browse/HIVE-4612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667059#comment-13667059
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Remus Rusanu commented on HIVE-4612:
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The problem is that the BinaryWritable key emitted by VGBy does not match the
original column type. Eg. if column is 'int' the VGBy will emit 'long', ie. 8
bytes vs. 4 bytes. The reduce side is reading the 4 bytes it knows about, hence
the result corruption.
> Vectorized aggregates do not emit proper rows in presence of GROUP BY
> ---------------------------------------------------------------------
>
> Key: HIVE-4612
> URL: https://issues.apache.org/jira/browse/HIVE-4612
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor
> Affects Versions: vectorization-branch
> Reporter: Remus Rusanu
> Assignee: Remus Rusanu
>
> I discovered this while testing the fix for HIVE-4451 and HIVE-4452. The VGBy
> is emitting appropriate number of rows, but the row-mode ReduceSinkOperatoir
> only logs one row and the final result is incomplete. Investigating. Related
> to HIVE-4599.
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