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https://issues.apache.org/jira/browse/ARROW-6736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Grove resolved ARROW-6736.
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Resolution: Fixed
Issue resolved by pull request 5542
[https://github.com/apache/arrow/pull/5542]
> [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
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> 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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