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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21007) Semi join + Union can lead to wrong plans
Date Sun, 09 Dec 2018 19:57:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714079#comment-16714079
] 

Vineet Garg commented on HIVE-21007:
------------------------------------

[~jcamachorodriguez] Can you take a look? Latest patch addresses all review comments.

> Semi join + Union can lead to wrong plans
> -----------------------------------------
>
>                 Key: HIVE-21007
>                 URL: https://issues.apache.org/jira/browse/HIVE-21007
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>         Attachments: HIVE-21007.1.patch, HIVE-21007.2.patch, HIVE-21007.3.patch, HIVE-21007.4.patch,
HIVE-21007.5.patch, HIVE-21007.6.patch, HIVE-21007.7.patch
>
>
> Tez compiler has the ability to push JOIN within UNION (by replicating join on each branch).
If this JOIN had a SJ branch outgoing (or incoming) it could mess up the plan and end up generating
incorrect or wrong plan.
> As a safe measure any SJ branch after UNION should be removed (until we improve the logic
to better handle SJ branches)



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