tustvold commented on code in PR #1552:
URL: https://github.com/apache/arrow-rs/pull/1552#discussion_r848648673
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arrow/src/record_batch.rs:
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@@ -243,7 +248,7 @@ impl RecordBatch {
/// # }
/// ```
pub fn num_rows(&self) -> usize {
- self.columns[0].data().len()
+ self.row_count
Review Comment:
Yup, it's basically a way to support projecting no columns and just getting
the row count. This is needed for #1537
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