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https://issues.apache.org/jira/browse/ARROW-4596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16797381#comment-16797381
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Neville Dipale commented on ARROW-4596:
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Hi [~LukeMathWalker], Arrow developers will be releasing an 0.13 RC probably in
the next few days. Are you still comfortable with getting this ready by then,
or should we move it to the 0.14 release?
> [Rust] [DataFusion] Implement COUNT aggregate function
> ------------------------------------------------------
>
> Key: ARROW-4596
> URL: https://issues.apache.org/jira/browse/ARROW-4596
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust, Rust - DataFusion
> Reporter: Andy Grove
> Assignee: Luca Palmieri
> Priority: Major
> Labels: newbie
> 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.
> COUNT(DISTINCT expr) should be handled in a separate issue since it is more
> complex.
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