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From "Vineet Garg (JIRA)" <>
Subject [jira] [Updated] (HIVE-21007) Semi join + Union can lead to wrong plans
Date Fri, 07 Dec 2018 03:46:00 GMT


Vineet Garg updated HIVE-21007:
    Status: Open  (was: Patch Available)

> Semi join + Union can lead to wrong plans
> -----------------------------------------
>                 Key: HIVE-21007
>                 URL:
>             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,
> 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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