Function tile

nodedb-array/src/query/aggregate.rs:247–255

(rows: &[(i64, Option<f64>)])

    }

    fn tile(rows: &[(i64, Option<f64>)]) -> SparseTile {
        let s = schema();
        let mut b = SparseTileBuilder::new(&s);
        for (k, v) in rows {
            let cv = v.map(CellValue::Float64).unwrap_or(CellValue::Null);
            b.push(&[CoordValue::Int64(*k)], &[cv]).unwrap();
        }
        b.build()
    }

    #[test]
    fn sum_skips_nulls() {