Simple zone map usage

zone_map.rs

use lever::index::zonemap::ZoneMap;

fn main() {
  let customers: Vec<i32> = vec![
      vec![1, 0, -1, -2].repeat(500),
      vec![1, 2, 3, 4].repeat(250)
  ].concat();

  let ingestion_data = vec![
      ("customers", customers.as_slice()),
  ];
  let zm = ZoneMap::from(ingestion_data);
  let (l, r) = zm.scan_range("customers", 4, 4, &*customers);
  customers[l..=r].iter().filter(|x| **x >= 4).sum::<i32>()
}