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Posted to jira@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2021/10/11 17:34:00 UTC

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

Neal Richardson created ARROW-14288:
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             Summary: [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
             Fix For: 7.0.0


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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