[jira] [Assigned] (HIVE-20393) Semijoin Reduction : markSemiJoinForDPP behaves inconsistently

["Deepak Jaiswal (JIRA)" <ji...@apache.org>]

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

Deepak Jaiswal reassigned HIVE-20393:
-------------------------------------


> 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
>
> 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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