hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21007) Semi join + Union can lead to wrong plans
Date Wed, 05 Dec 2018 06:43:00 GMT

     [ 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)



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

Mime
View raw message