Andy Grove created ARROW-6690:
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Summary: [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
Fix For: 1.0.0
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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