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Posted to jira@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2021/04/08 17:15:00 UTC

[jira] [Commented] (ARROW-12291) [R] Determine the type of an unevaluated expression

    [ https://issues.apache.org/jira/browse/ARROW-12291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317357#comment-17317357 ] 

Neal Richardson commented on ARROW-12291:
-----------------------------------------

I think this just isn't knowable from R without evaluating the expressions, or otherwise reimplementing the C++ kernel logic. 

> [R] Determine the type of an unevaluated expression
> ---------------------------------------------------
>
>                 Key: ARROW-12291
>                 URL: https://issues.apache.org/jira/browse/ARROW-12291
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Ian Cook
>            Priority: Major
>
> There would be several benefits to knowing the data type of an expression before its value has actually been computed. Probably the greatest benefit would be that other expressions could then behave dynamically based on the data types of their inputs. Consider how this capability might be implemented.



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