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Posted to issues@arrow.apache.org by "Andy Grove (JIRA)" <ji...@apache.org> on 2019/02/16 23:20:00 UTC

[jira] [Created] (ARROW-4596) [Rust] [DataFusion] Implement COUNT aggregate function

Andy Grove created ARROW-4596:
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             Summary: [Rust] [DataFusion] Implement COUNT aggregate function
                 Key: ARROW-4596
                 URL: https://issues.apache.org/jira/browse/ARROW-4596
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Andy Grove
             Fix For: 0.13.0


Add support for COUNT aggregate function. See SUM function in aggregates.rs for inspiration.

SQL parser should support COUNT(1) and COUNT(*) syntax for counting rows as well as COUNT(column_name) for counting non-null values for a column.



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