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From "Deepak Jaiswal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-20393) Semijoin Reduction : markSemiJoinForDPP behaves inconsistently
Date Wed, 15 Aug 2018 07:04:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Deepak Jaiswal updated HIVE-20393:
----------------------------------
    Attachment: HIVE-20393.1.patch

> Semijoin Reduction : markSemiJoinForDPP behaves inconsistently
> --------------------------------------------------------------
>
>                 Key: HIVE-20393
>                 URL: https://issues.apache.org/jira/browse/HIVE-20393
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>            Priority: Major
>         Attachments: HIVE-20393.1.patch
>
>
> markSemiJoinForDPP has multiple issues,
>  
>  * Uses map tsOps which is wrong as it disallows going thru same TS which may have filters
from more than 1 semijoin edges. This results in inconsistent plans for same query as semijoin
edges may be processed in different order each time.
>  * Uses getColumnExpr() which is not as robust as extractColumn() thus resulting in NPEs.
>  * The logic to mark an edge useful when NPE is hit may end up having bad edge.
> cc [~gopalv]



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