Andy Grove commented on ARROW-6947:

It's important to remember that these UDFs will operate on columns, not rows, 
so although there is overhead in checking the data types of the input 
arguments, this happens once per batch and not once per row.

> [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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