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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2021/10/07 14:06:00 UTC
[jira] [Commented] (ARROW-14254) [C++] Return a random sample of
rows from a query
[ https://issues.apache.org/jira/browse/ARROW-14254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17425574#comment-17425574 ]
Antoine Pitrou commented on ARROW-14254:
----------------------------------------
That's easily decomposed into two different kernels:
* one kernel that generates K random integers between 0 and N (with or without duplicates)
* the existing Take kernel to index the original array/batch... with random-generated indices
> [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
>
> 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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