Function UnsafeAppendToBitmap

cpp/src/arrow/array/builder_base.h:228–232

Append to null bitmap, update the length

  // Append to null bitmap, update the length
  void UnsafeAppendToBitmap(bool is_valid) {
    null_bitmap_builder_.UnsafeAppend(is_valid);
    ++length_;
    if (!is_valid) ++null_count_;
  }

  // Vector append. Treat each zero byte as a nullzero. If valid_bytes is null
  // assume all of length bits are valid.