[jira] [Comment Edited] (ARROW-13893) [R] Improve head/tail/[ methods on Dataset and queries

["Weston Pace (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-13893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419952#comment-17419952 ] 

Weston Pace edited comment on ARROW-13893 at 9/24/21, 7:50 PM:
---------------------------------------------------------------

I'd kind of expect it to work too given our current threading model but, in general, and specifically with some of the threading models being proposed, you would need resequencing/serialization and not just an implicit order.

Otherwise it is perfectly reasonable for the following ordering:

Sort node emits batch 1
Sort node emits batch 2
Project node emits batch 2
Project node emits batch 1


was (Author: westonpace):
I'd kind of expect it to work too given our current threading model but, in general, and specifically with some of the threading models being proposed, you would need resequencing and not just an implicit order.

Otherwise it is perfectly reasonable for the following ordering:

Sort node emits batch 1
Sort node emits batch 2
Project node emits batch 2
Project node emits batch 1

> [R] Improve head/tail/[ methods on Dataset and queries
> ------------------------------------------------------
>
>                 Key: ARROW-13893
>                 URL: https://issues.apache.org/jira/browse/ARROW-13893
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Neal Richardson
>            Assignee: Neal Richardson
>            Priority: Major
>             Fix For: 6.0.0
>
>




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