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Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2018/12/05 06:43:00 UTC

[jira] [Updated] (HIVE-21007) Semi join + Union can lead to wrong plans

     [ https://issues.apache.org/jira/browse/HIVE-21007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vineet Garg updated HIVE-21007:
-------------------------------
    Attachment: HIVE-21007.1.patch

> 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
>
>
> 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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