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https://issues.apache.org/jira/browse/ARROW-14254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435068#comment-17435068
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Weston Pace commented on ARROW-14254:
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[~npr] Gentle ping. I'm still not sure if this JIRA is asking for:
* Generate a random sample of all rows in the dataset (e.g. if the dataset has
1 million rows and I sample 5 then those 5 could come from anywhere in the 1
million and the output will always have 5 rows)
* Generate a random sample of each batch that flows through the excecution
plan (e.g. if the dataset has 1 million rows and I scan in batches of 100k and
take 5 rows from each batch I get 50 rows. If I scan in a single 1 million row
batch I get 5 rows).
> [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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