Andy Grove created ARROW-4748:
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Summary: [Rust] [DataFusion] GROUP BY performance could be
optimized
Key: ARROW-4748
URL: https://issues.apache.org/jira/browse/ARROW-4748
Project: Apache Arrow
Issue Type: Improvement
Components: Rust, Rust - DataFusion
Affects Versions: 0.12.0
Reporter: Andy Grove
Fix For: 0.13.0
The logic to build the group by keys is row-based, performing an array downcast
on every single group by value. This could be done in a columnar way instead.
I also wonder if it is possible to avoid converting the result map to an array
of map entries.
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