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https://issues.apache.org/jira/browse/HIVE-8478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14175457#comment-14175457
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Prasanth J commented on HIVE-8478:
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LGTM, +1
> Vectorized Reduce-Side Group By doesn't handle Decimal type correctly
> ---------------------------------------------------------------------
>
> Key: HIVE-8478
> URL: https://issues.apache.org/jira/browse/HIVE-8478
> Project: Hive
> Issue Type: Bug
> Components: Vectorization
> Affects Versions: 0.14.0
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Fix For: 0.14.0
>
> Attachments: HIVE-8478.01.patch, HIVE-8478.02.patch,
> HIVE-8478.03.patch, HIVE-8478.04.patch
>
>
> Note that DecimalColumnVector is different than LongColumnVector because it
> keeps (an instance) reference to a Decimal128 class whereas the latter stores
> a long primitive value. So, trouble if you set the reference instead of
> updating the object.
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