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https://issues.apache.org/jira/browse/HIVE-20915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16713022#comment-16713022
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Zoltan Haindrich commented on HIVE-20915:
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sorry; but I don't understand what do you mean by that.
* these tests are there to test "auto column stats collection" ; which
pre-existed before this ticket.
* I don't think any new feature is expected to break existing ones
* removing "that groupby" along with that compute_stats() call is essential
removes column stats gathering ; which makes it inoperable.
> Make dynamic sort partition optimization available to HoS and MR
> ----------------------------------------------------------------
>
> Key: HIVE-20915
> URL: https://issues.apache.org/jira/browse/HIVE-20915
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Affects Versions: 4.0.0
> Reporter: Yongzhi Chen
> Assignee: Yongzhi Chen
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-20915.1.patch, HIVE-20915.2.patch,
> HIVE-20915.3.patch, HIVE-20915.4.patch, HIVE-20915.5.patch
>
>
> HIVE-20703 put dynamic sort partition optimization under cost based decision,
> but it also makes the optimizer only available to tez.
> hive.optimize.sort.dynamic.partition works with other execution engines for a
> long time, we should keep the optimizer available to them.
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