Method rows_for_hash

perro_source/core/perro_csv/src/lib.rs:420–424

(&self, hash: u64, out: &mut Vec<usize>)

        let Some(row) = self.rows.get_mut(row) else {
            return Err(format!("csv row index out of range: {row}"));
        };
        let Some(cell) = row.get_mut(col) else {
            return Err(format!("csv column index out of range: {col}"));
        };
        *cell = value.into();
        Ok(())
    }