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Posted to jira@arrow.apache.org by "Andy Grove (Jira)" <ji...@apache.org> on 2020/12/24 19:02:00 UTC

[jira] [Assigned] (ARROW-10782) [Rust] [DataFusion] Optimize hash join to use smaller relation as build side

     [ https://issues.apache.org/jira/browse/ARROW-10782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Grove reassigned ARROW-10782:
----------------------------------

    Assignee: Daniël Heres

> [Rust] [DataFusion] Optimize hash join to use smaller relation as build side
> ----------------------------------------------------------------------------
>
>                 Key: ARROW-10782
>                 URL: https://issues.apache.org/jira/browse/ARROW-10782
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust - DataFusion
>            Reporter: Andy Grove
>            Assignee: Daniël Heres
>            Priority: Major
>
> When performing an inner join using the hash join algorithm, it is more efficient to load the smaller table into memory and then stream the larger table.
> We should the statistics made available in https://issues.apache.org/jira/browse/ARROW-10781 to build an optimizer rule to determine the smaller side of a join and use that as the build/hash side.



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