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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