[jira] [Created] (ARROW-6657) [Rust] [DataFusion] Implement COUNT aggregate expression

[Andy Grove (Jira)]

Andy Grove created ARROW-6657:
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             Summary: [Rust] [DataFusion] Implement COUNT aggregate expression
                 Key: ARROW-6657
                 URL: https://issues.apache.org/jira/browse/ARROW-6657
             Project: Apache Arrow
          Issue Type: Sub-task
            Reporter: Andy Grove
             Fix For: 1.0.0


Implement COUNT aggregate expressions. See the SUM implementation for 
inspiration.



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