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Posted to issues@arrow.apache.org by "Andy Grove (JIRA)" <ji...@apache.org> on 2019/06/01 21:44:00 UTC

[jira] [Updated] (ARROW-4748) [Rust] [DataFusion] GROUP BY performance could be optimized

     [ https://issues.apache.org/jira/browse/ARROW-4748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Grove updated ARROW-4748:
------------------------------
    Fix Version/s:     (was: 0.14.0)

> [Rust] [DataFusion] GROUP BY performance could be optimized
> -----------------------------------------------------------
>
>                 Key: ARROW-4748
>                 URL: https://issues.apache.org/jira/browse/ARROW-4748
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust, Rust - DataFusion
>    Affects Versions: 0.12.0
>            Reporter: Andy Grove
>            Priority: Major
>
> The logic to build the group by keys is row-based, performing an array downcast on every single group by value. This could be done in a columnar way instead.
>  
> I also wonder if it is possible to avoid converting the result map to an array of map entries.



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