Function compact_preserves_string_data

nodedb-columnar/src/compaction/tests.rs:138–165

()

#[test]
fn compact_preserves_string_data() {
    let segment = write_segment(20);
    let mut deletes = DeleteBitmap::new();
    deletes.mark_deleted(0); // Delete first row.

    let result =
        compact_segment(&segment, &deletes, &test_schema(), 0, None, None).expect("compact");
    let new_seg = result.segment.as_ref().expect("segment");
    let reader = SegmentReader::open(new_seg).expect("open");

    // Read the name column (string).
    let col = reader.read_column(1).expect("read name");
    match col {
        DecodedColumn::Binary {
            data,
            offsets,
            valid,
        } => {
            // First row should be "user_1" (user_0 was deleted).
            let start = offsets[0] as usize;
            let end = offsets[1] as usize;
            let first_name = std::str::from_utf8(&data[start..end]).expect("utf8");
            assert_eq!(first_name, "user_1");
            assert!(valid[0]);
        }
        _ => panic!("expected Binary"),
    }
}