[jira] [Commented] (ARROW-17779) [R] Add "first" and "last" functions from xts library

["Nicola Crane (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-17779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17625326#comment-17625326 ] 

Nicola Crane commented on ARROW-17779:
--------------------------------------

Unfortunately, this (using head() or tail() inside a summarise function) cannot be done until ARROW-13926 is supported.  That said, there's also no need as far as I can see, given you'd get the same result just calling {{head()}} outside of {{summarise()}} in a simple use case like the one in the reprex.

As we have head() and tail() supported, I can't see the need to also implement first() and last() as they achieve the same things.  If there are more details to this use case though that show otherwise, feel free to open a new ticket with those details.

> [R] Add "first" and "last" functions from xts library
> -----------------------------------------------------
>
>                 Key: ARROW-17779
>                 URL: https://issues.apache.org/jira/browse/ARROW-17779
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: N Gautam Animesh
>            Priority: Major
>         Attachments: image.png
>
>
> Functions like "first" and "last" from the XTS library aren't yet implemented in arrow. Please look into this and do the needful.



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