Andy Grove created ARROW-9679:
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Summary: [Rust] [DataFusion] HashAggregate walks map many times
building final batch
Key: ARROW-9679
URL: https://issues.apache.org/jira/browse/ARROW-9679
Project: Apache Arrow
Issue Type: Improvement
Components: Rust, Rust - DataFusion
Reporter: Andy Grove
The current HashAggregate implementation iterates over the final hash map once
for each grouping expression and once for each aggregate expression. This is
inefficient and possibly dangerous depending on the ordering gaurantees made by
the hash map implementation.
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