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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-21006) Extend SharedWorkOptimizer to remove semijoins when there is a reutilization opportunity
Date Wed, 05 Dec 2018 04:20:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez reassigned HIVE-21006:
----------------------------------------------


> Extend SharedWorkOptimizer to remove semijoins when there is a reutilization opportunity
> ----------------------------------------------------------------------------------------
>
>                 Key: HIVE-21006
>                 URL: https://issues.apache.org/jira/browse/HIVE-21006
>             Project: Hive
>          Issue Type: Improvement
>          Components: Physical Optimizer
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>
> Assume there are two TS operators in the plan over the same table, same columns, same
conditions, etc.
> The first TS operator, TS1, has an incoming SJ edge. The second TS operator, TS2, does
not have any incoming SJ edge.
> Since TS2 is reading the full table, we may just remove the SJ and TS1. Then we will
keep and share TS2, since it reads all the data in any case.



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