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https://issues.apache.org/jira/browse/ARROW-6690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Grove resolved ARROW-6690.
-------------------------------
Resolution: Fixed
Issue resolved by pull request 5606
[https://github.com/apache/arrow/pull/5606]
> [Rust] [DataFusion] HashAggregate without GROUP BY should use SIMD
> ------------------------------------------------------------------
>
> Key: ARROW-6690
> URL: https://issues.apache.org/jira/browse/ARROW-6690
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: Rust, Rust - DataFusion
> Reporter: Andy Grove
> Assignee: Andy Grove
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Currently the implementation of HashAggregate in the new physical plan uses
> the same logic regardless of whether a grouping expression is used.
> For the case where there is no grouping expression, such as "SELECT SUM(a)
> FROM b" we can use the compute kernels to perform an aggregate operation on
> each batch rather than iterating over each row and accumulating individual
> values.
> This optimization already exists in the original implementation of aggregate
> queries direct from the logical plan.
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