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Posted to issues@arrow.apache.org by "Luca Palmieri (JIRA)" <ji...@apache.org> on 2019/03/11 09:01:00 UTC
[jira] [Commented] (ARROW-4596) [Rust] [DataFusion] Implement COUNT
aggregate function
[ https://issues.apache.org/jira/browse/ARROW-4596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16789313#comment-16789313 ]
Luca Palmieri commented on ARROW-4596:
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I'd be happy to work on this! Should I ask you to mark it as in progress [~andygrove]?
> [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: Nicolas Trinquier
> 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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