Kyle McCarthy commented on ARROW-6947:

I would like to provide some assistance with implementing UDFs. Is the idea to 
implement them similarly to gandiva and generate LLVM IR or WebAssembly? Or to 
provide a trait for users to implement for their UDF and then register?

> [Rust] [DataFusion] Add support for scalar UDFs
> -----------------------------------------------
>                 Key: ARROW-6947
>                 URL: https://issues.apache.org/jira/browse/ARROW-6947
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Rust, Rust - DataFusion
>            Reporter: Andy Grove
>            Assignee: Andy Grove
>            Priority: Major
> As a user, I would like to be able to define my own functions and then use 
> them in SQL statements.

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