Andy Grove resolved ARROW-6690.
    Resolution: Fixed

Issue resolved by pull request 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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