Andy Grove created ARROW-6736:
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Summary: [Rust] [DataFusion] Aggregate expressions get evaluated
repeatedly
Key: ARROW-6736
URL: https://issues.apache.org/jira/browse/ARROW-6736
Project: Apache Arrow
Issue Type: Bug
Components: Rust, Rust - DataFusion
Affects Versions: 0.15.0
Reporter: Andy Grove
Assignee: Andy Grove
Fix For: 1.0.0
There is a design flaw in the new aggregate expression traits and
implementations where the input to the aggregate expression gets evaluated
against the whole batch once for each row in the batch. For example, if the
batch has 1024 rows then the expression gets evaluated 1024 times instead of
once.
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