Method GetBlockSlow

cpp/src/arrow/util/bit_block_counter.cc:30–38

namespace internal {

BitBlockCount BitBlockCounter::GetBlockSlow(int64_t block_size) noexcept {
  const int16_t run_length = static_cast<int16_t>(std::min(bits_remaining_, block_size));
  int16_t popcount = static_cast<int16_t>(CountSetBits(bitmap_, offset_, run_length));
  bits_remaining_ -= run_length;
  // This code path should trigger _at most_ 2 times. In the "two times"
  // case, the first time the run length will be a multiple of 8 by construction
  bitmap_ += run_length / 8;
  return {run_length, popcount};
}

OptionalBitBlockCounter::OptionalBitBlockCounter(const uint8_t* validity_bitmap,
                                                 int64_t offset, int64_t length)