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Posted to issues@arrow.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2019/09/30 00:16:00 UTC

[jira] [Updated] (ARROW-6736) [Rust] [DataFusion] Aggregate expressions get evaluated repeatedly

     [ https://issues.apache.org/jira/browse/ARROW-6736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-6736:
----------------------------------
    Labels: pull-request-available  (was: )

> [Rust] [DataFusion] Aggregate expressions get evaluated repeatedly
> ------------------------------------------------------------------
>
>                 Key: ARROW-6736
>                 URL: https://issues.apache.org/jira/browse/ARROW-6736
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Rust, Rust - DataFusion
>    Affects Versions: 0.15.0
>            Reporter: Andy Grove
>            Assignee: Andy Grove
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>
> There is a design flaw in the new aggregate expression traits and implementations where the input to the aggregate expression gets evaluated against the whole batch once for each row in the batch. For example, if the batch has 1024 rows then the expression gets evaluated 1024 times instead of once.



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