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https://issues.apache.org/jira/browse/HIVE-363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688797#action_12688797
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Raghotham Murthy commented on HIVE-363:
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looks like the dummyRow flag is not being used anywhere during execution time.
> [hive] extra rows for count distinct
> ------------------------------------
>
> Key: HIVE-363
> URL: https://issues.apache.org/jira/browse/HIVE-363
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.3.0
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: hive.363.1.patch
>
>
> select count(distinct a) from T
> returns dummy rows from all reducers if number of reducers are more than 1
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