Neal Richardson created ARROW-9697:
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Summary: [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
Fix For: 2.0.0
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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