pitrou commented on code in PR #39337:
URL: https://github.com/apache/arrow/pull/39337#discussion_r1434113488
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cpp/src/parquet/metadata.h:
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@@ -306,9 +306,15 @@ class PARQUET_EXPORT FileMetaData {
int num_schema_elements() const;
/// \brief The total number of rows.
+ ///
+ /// If the FileMetaData is generate from a `SubSet()`, the number of rows
+ /// will be the sum of the number of rows of remaining RowGroup.
int64_t num_rows() const;
/// \brief The number of row groups in the file.
+ ///
+ /// If the FileMetaData is generate from a `SubSet()`, the number of
+ /// row groups will be the number of remaining RowGroup.
Review Comment:
Similarly:
```suggestion
/// If the FileMetaData was obtained by calling `SubSet()`, this is the
number
/// of selected row groups.
```
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