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https://issues.apache.org/jira/browse/HIVE-6611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13932198#comment-13932198
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Gunther Hagleitner commented on HIVE-6611:
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Ran unit tests locally: results are good.
> Joining multiple union all outputs fails on Tez
> -----------------------------------------------
>
> Key: HIVE-6611
> URL: https://issues.apache.org/jira/browse/HIVE-6611
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Priority: Critical
> Attachments: HIVE-6611.1.patch
>
>
> Queries like:
> with u as (select * from src union all select * from src)
> select * from u join u;
> will fail on Tez because only one union flows into the join reduce phase.
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