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From "Jesus Camacho Rodriguez (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-24041) Extend semijoin conversion rules
Date Sat, 15 Aug 2020 03:32:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-24041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez reassigned HIVE-24041:
----------------------------------------------


> Extend semijoin conversion rules
> --------------------------------
>
>                 Key: HIVE-24041
>                 URL: https://issues.apache.org/jira/browse/HIVE-24041
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>
> This patch fixes a couple of limitations that can be seen in {{cbo_query95.q}}, in particular:
> - It adds a rule to trigger semijoin conversion when the there is an aggregate on top
of the join that prunes all columns from left side, and the aggregate operator is on the left
input of the join.
> - It extends existing semijoin conversion rules to prune the unused columns from its
left input, which leads to additional conversion opportunities.



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