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https://issues.apache.org/jira/browse/ARROW-4596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661619#comment-17661619
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Rok Mihevc commented on ARROW-4596:
-----------------------------------
This issue has been migrated to [issue
#21137|https://github.com/apache/arrow/issues/21137] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [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, pull-request-available
> Fix For: 0.14.0
>
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> 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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