Function LevelsToBitmap

cpp/src/parquet/level_comparison_inc.h:37–45

///
template <typename Predicate>
inline uint64_t LevelsToBitmap(const int16_t* levels, int64_t num_levels,
                               Predicate predicate) {
  // Both clang and GCC can vectorize this automatically with SSE4/AVX2.
  uint64_t mask = 0;
  for (int x = 0; x < num_levels; x++) {
    mask |= static_cast<uint64_t>(predicate(levels[x]) ? 1 : 0) << x;
  }
  return ::arrow::bit_util::ToLittleEndian(mask);
}

inline MinMax FindMinMaxImpl(const int16_t* levels, int64_t num_levels) {
  MinMax out{std::numeric_limits<int16_t>::max(), std::numeric_limits<int16_t>::min()};