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Posted to jira@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2021/09/20 13:58:00 UTC
[jira] [Commented] (ARROW-13767) [R] Add Arrow methods slice(),
slice_head(), slice_tail()
[ https://issues.apache.org/jira/browse/ARROW-13767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17417668#comment-17417668 ]
Neal Richardson commented on ARROW-13767:
-----------------------------------------
I'm not sure about these (and about head/tail in general now) since dataset scans are no longer in deterministic order. How do dbplyr backends support these for databases that behave similarly?
> [R] Add Arrow methods slice(), slice_head(), slice_tail()
> ---------------------------------------------------------
>
> Key: ARROW-13767
> URL: https://issues.apache.org/jira/browse/ARROW-13767
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Ian Cook
> Priority: Major
> Labels: query-engine
> Fix For: 7.0.0
>
>
> Implement [{{slice()}}, {{slice_head()}}, and {{slice_tail()}}|https://dplyr.tidyverse.org/reference/slice.html] methods for {{ArrowTabular}}, {{Dataset}}, and {{arrow_dplyr_query}} objects . I believe this should be relatively straightforward, using {{Take()}} to return only the specified rows. We already have a {{head()}} method which I believe we can reuse for {{slice_head()}}.
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