code: public float[] getFloats(int rowId, int count) {
      float[] res = new float[count];
      for (int i = 0; i < count; i++) {
        res[i] = getFloat(rowId + i);
      }
      return res;
    }
docs: Gets float type values from [rowId, rowId + count). The return values for the null slots
  are undefined and can be anything.