Method RandomBitmap

be/src/kudu/util/bitmap-test.cc:74–84

struct RandomBitmap {
  RandomBitmap(int n_bits, double set_ratio) {
    bm.resize(BitmapSize(n_bits));
    Random r(GetRandomSeed32());
    for (int i = 0; i < n_bits; i++) {
      bool set = r.NextDoubleFraction() < set_ratio;
      BitmapChange(bm.data(), i, set);
      if (set) {
        set_bits.insert(i);
      }
    }
  }

  faststring bm;
  std::set<int> set_bits;