Function read_float64_with_nulls

nodedb-columnar/src/reader/block_decode.rs:445–464

()

    #[test]
    fn read_float64_with_nulls() {
        let segment = write_test_segment(100);
        let reader = SegmentReader::open(&segment).expect("open");

        let col = reader.read_column(2).expect("read score column");
        // Score column uses AlpFastLanesLz4 → decoded as Float64.
        let (values, valid) = match &col {
            DecodedColumn::Float64 { values, valid } => (values.as_slice(), valid.as_slice()),
            other => panic!("expected Float64, got {other:?}"),
        };

        // Float64 column: every 5th row is null (rows 0,5,10,...,95 = 20 nulls).
        assert_eq!(valid.len(), 100);
        let null_count = valid.iter().filter(|&&v| !v).count();
        assert_eq!(null_count, 20);

        // Row 1: score = 1 * 0.5 = 0.5
        assert!(valid[1]);
        assert!((values[1] - 0.5).abs() < 0.001);
    }

    #[test]
    fn predicate_pushdown_skips_blocks() {