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

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

Daniel Russo created ARROW-10043:
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             Summary: [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


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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