Function write_large_ts_segment

nodedb/src/engine/timeseries/columnar_bridge.rs:471–486

Write a segment whose timestamp column uses values far above 2^53. These values are not exactly representable in f64, so the old `ScanPredicate::gte(ts_col_idx, start_ms as f64)` path would round the predicate and produce incorrect block-skip decisions.

(start_ts: i64, count: usize)

    /// `ScanPredicate::gte(ts_col_idx, start_ms as f64)` path would round
    /// the predicate and produce incorrect block-skip decisions.
    fn write_large_ts_segment(start_ts: i64, count: usize) -> Vec<u8> {
        let mut mt = ColumnarMemtable::new_metric(default_config());
        for i in 0..count {
            let ts = start_ts + i as i64;
            let result = mt.ingest_metric(
                (i % 3) as u64,
                MetricSample {
                    timestamp_ms: ts,
                    value: i as f64,
                },
            );
            assert_ne!(result, nodedb_types::timeseries::IngestResult::Rejected);
        }
        let drain = mt.drain();
        write_ts_drain_as_segment(&drain, None).expect("write large-ts segment")
    }

    /// end-to-end block skip with timestamps outside ±2^53.
    ///