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Posted to issues@arrow.apache.org by "Andy Grove (Jira)" <ji...@apache.org> on 2019/09/30 00:08:00 UTC

[jira] [Created] (ARROW-6736) [Rust] [DataFusion] Aggregate expressions get evaluated repeatedly

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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