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https://issues.apache.org/jira/browse/ARROW-9697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-9697:
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Labels: dataset pull-request-available (was: dataset)
> [C++][Dataset] num_rows method for Dataset/Scanner
> --------------------------------------------------
>
> Key: ARROW-9697
> URL: https://issues.apache.org/jira/browse/ARROW-9697
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Neal Richardson
> Assignee: David Li
> Priority: Major
> Labels: dataset, pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Something like Scanner::ToTable except first Project to keep 0 columns, and
> for each record batch, grab the num_rows. Then sum the resulting vector.
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