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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