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https://issues.apache.org/jira/browse/HIVE-5357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13778054#comment-13778054
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Ashutosh Chauhan commented on HIVE-5357:
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+1
> ReduceSinkDeDuplication optimizer pick the wrong keys in pRS-cGBYm-cRS-cGBYr
> scenario when there are distinct keys in child GBY
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-5357
> URL: https://issues.apache.org/jira/browse/HIVE-5357
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: Chun Chen
> Assignee: Chun Chen
> Fix For: 0.12.0
>
> Attachments: HIVE-5357.patch
>
>
> {code}
> select key, count(distinct value) from (select key, value from src group by
> key, value) t group by key;
> //result
> 0 0 NULL
> 10 10 NULL
> 100 100 NULL
> 103 103 NULL
> 104 104 NULL
> {code}
> Obviously the result is wrong.
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