Function read_string_column

nodedb-columnar/src/reader/block_decode.rs:416–442

()

    #[test]
    fn read_string_column() {
        let segment = write_test_segment(50);
        let reader = SegmentReader::open(&segment).expect("open");

        let col = reader.read_column(1).expect("read name column");
        match col {
            DecodedColumn::Binary {
                data,
                offsets,
                valid,
            } => {
                assert_eq!(valid.len(), 50);
                assert!(valid.iter().all(|&v| v));
                // Check first row.
                let start = offsets[0] as usize;
                let end = offsets[1] as usize;
                let first = std::str::from_utf8(&data[start..end]).expect("utf8");
                assert_eq!(first, "user_0");
                // Check last row.
                let start = offsets[49] as usize;
                let end = offsets[50] as usize;
                let last = std::str::from_utf8(&data[start..end]).expect("utf8");
                assert_eq!(last, "user_49");
            }
            _ => panic!("expected Binary (string)"),
        }
    }

    #[test]
    fn read_float64_with_nulls() {