[jira] [Created] (ARROW-6901) [Rust][Parquet] Rust Parquet SerializedFileWriter writes total_num_rows as zero

["Matthew Franglen (Jira)" <ji...@apache.org>]

Matthew Franglen created ARROW-6901:
---------------------------------------

             Summary: [Rust][Parquet] Rust Parquet SerializedFileWriter writes total_num_rows as zero
                 Key: ARROW-6901
                 URL: https://issues.apache.org/jira/browse/ARROW-6901
             Project: Apache Arrow
          Issue Type: Bug
          Components: Rust
    Affects Versions: 0.15.0, 0.14.1
            Reporter: Matthew Franglen


The SerializedFileWriter does not update total_num_rows at any point. This results in consistently writing zero as the number of rows in the file.

 

This code will fail:
{code:java}
let data = vec![vec![1, 2, 3, 4, 5]];
let file = ...; // a file path herelet schema = Rc::new(
    types::Type::group_type_builder("schema")
        .with_fields(&mut vec![Rc::new(
            types::Type::primitive_type_builder("col1", Type::INT32)
                .with_repetition(Repetition::REQUIRED)
                .build()
                .unwrap(),
        )])
        .build()
        .unwrap(),
);
let props = Rc::new(WriterProperties::builder().build());
let mut file_writer =
    SerializedFileWriter::new(file.try_clone().unwrap(), schema, props).unwrap();
let mut rows: i64 = 0;for subset in &data {
    let mut row_group_writer = file_writer.next_row_group().unwrap();
    let col_writer = row_group_writer.next_column().unwrap();
    if let Some(mut writer) = col_writer {
        match writer {
            ColumnWriter::Int32ColumnWriter(ref mut typed) => {
                rows += typed.write_batch(&subset[..], None, None).unwrap() as i64;
            }
            _ => {
                unimplemented!();
            }
        }
        row_group_writer.close_column(writer).unwrap();
    }
    file_writer.close_row_group(row_group_writer).unwrap();
}file_writer.close().unwrap();let reader = SerializedFileReader::new(file).unwrap();
assert_eq!(reader.num_row_groups(), data.len());
assert_eq!(reader.metadata().file_metadata().num_rows(), rows, "row count in metadata not equal to number of rows written");
{code}



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