[jira] [Assigned] (ARROW-10043) [Rust] [DataFusion] Introduce support for DISTINCT by partially implementing COUNT(DISTINCT)

["Jorge (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jorge reassigned ARROW-10043:
-----------------------------

    Assignee: Daniel Russo

> [Rust] [DataFusion] Introduce support for DISTINCT by partially implementing COUNT(DISTINCT)
> --------------------------------------------------------------------------------------------
>
>                 Key: ARROW-10043
>                 URL: https://issues.apache.org/jira/browse/ARROW-10043
>             Project: Apache Arrow
>          Issue Type: Wish
>          Components: Rust, Rust - DataFusion
>            Reporter: Daniel Russo
>            Assignee: Daniel Russo
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> I am unsure where support for {{DISTINCT}} may be on the DataFusion roadmap, so I've filed this with the "Wish" type and "Minor" priority to reflect that this is a proposal:
> Introduce {{DISTINCT}} into DataFusion by partially implementing {{COUNT(DISTINCT)}}. The ultimate goal is to fully support the {{DISTINCT}} keyword, but to get implementation started, limit the scope of this work to:
>  * the {{COUNT()}} aggregate function
>  * a single expression in {{COUNT()}}, i.e., {{COUNT(DISTINCT c1)}}, but not {{COUNT(DISTINCT c1, c2)}}
>  * only queries with a {{GROUP BY}} clause
>  * integer types



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