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https://issues.apache.org/jira/browse/ARROW-14254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435669#comment-17435669
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Weston Pace commented on ARROW-14254:
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> The prop version may not give an exact percentage
This is the only reason you would need two scans (assuming the user provided a
percentage).
If the user provided an exact number then you are correct. Top-k alone is fine.
> [C++] Return a random sample of rows from a query
> -------------------------------------------------
>
> Key: ARROW-14254
> URL: https://issues.apache.org/jira/browse/ARROW-14254
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Nicola Crane
> Priority: Major
> Labels: kernel, query-engine
> Fix For: 7.0.0
>
>
> Please can we have a kernel that returns a random sample of rows? We've had a
> request to be able to do this in R:
> https://github.com/apache/arrow-cookbook/issues/83
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