[jira] [Commented] (ARROW-9756) [Rust] [DataFusion] Add support for generic return types of scalar UDFs

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

    [ https://issues.apache.org/jira/browse/ARROW-9756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17386273#comment-17386273 ] 

Jorge Leitão commented on ARROW-9756:
-------------------------------------

yes, it already merged and got lost in the migration. Thanks for closing it. :+1:

> [Rust] [DataFusion] Add support for generic return types of scalar UDFs
> -----------------------------------------------------------------------
>
>                 Key: ARROW-9756
>                 URL: https://issues.apache.org/jira/browse/ARROW-9756
>             Project: Apache Arrow
>          Issue Type: New Feature
>            Reporter: Jorge Leitão
>            Assignee: Jorge Leitão
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> Currently, we have math functions declared as UDFs that while they can be evaluated against float32 and float64, their return type is fixed (float64).
> This issue is about extending the UDF interface to support generic return types (a function), so that developers (us included), can register UDFs or variable return types.
> There is a small overhead in this, since evaluating types now requires a function call, however, IMO this is still very small when compared to anything, as we are talking about plans. We can always apply some caching if needed.



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