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Posted to jira@arrow.apache.org by "Jonathan Keane (Jira)" <ji...@apache.org> on 2022/06/30 16:39:00 UTC

[jira] [Updated] (ARROW-14288) [R] Implement nrow on some collapsed queries

     [ https://issues.apache.org/jira/browse/ARROW-14288?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Keane updated ARROW-14288:
-----------------------------------
    Fix Version/s:     (was: 9.0.0)

> [R] Implement nrow on some collapsed queries
> --------------------------------------------
>
>                 Key: ARROW-14288
>                 URL: https://issues.apache.org/jira/browse/ARROW-14288
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Neal Richardson
>            Priority: Major
>
> collapse() doesn't always mean we can't determine the number of rows. We can try to solve some cases:
> * head/tail: compute number of rows, take the smaller of that and the head/tail number
> * if filter == TRUE, take the number of rows of .data (which may contain a query)



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