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Posted to jira@arrow.apache.org by "Joris Van den Bossche (Jira)" <ji...@apache.org> on 2021/12/16 16:32:00 UTC

[jira] [Commented] (ARROW-12439) [Rust] [DataFusion] Add support for eliminating hash repartition

    [ https://issues.apache.org/jira/browse/ARROW-12439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17460855#comment-17460855 ] 

Joris Van den Bossche commented on ARROW-12439:
-----------------------------------------------

Should this be moved to https://github.com/apache/arrow-rs/ or https://github.com/apache/arrow-datafusion?

> [Rust] [DataFusion] Add support for eliminating hash repartition
> ----------------------------------------------------------------
>
>                 Key: ARROW-12439
>                 URL: https://issues.apache.org/jira/browse/ARROW-12439
>             Project: Apache Arrow
>          Issue Type: Bug
>            Reporter: Daniël Heres
>            Priority: Major
>
> If the intermediate data is already partitioned on a certain expression (key), the repartition doesn't have to be added (in a join), or should be removed in an optimization rule. This will avoid having to repartition (and maybe shuffle in Ballista).



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