message: no alloc in loop
diff: @@ -460,8 +460,8 @@ mod bench {
  let fast_field_reader = MultiValuedFastFieldReader::open(idx_reader, vals_reader);
  b.iter(|| {
  let mut sum = 0u64;
  + let mut data = Vec::with_capacity(10);
  for i in 0u32..num_docs as u32 {
  - let mut data = vec![];
  fast_field_reader.get_vals(i, &mut data);
  sum += data.iter().sum::<u64>();
  }
  