Method InsertNull

cpp/src/arrow/json/chunked_builder.cc:255–267

call from Insert() only, with mutex_ locked

 private:
  // call from Insert() only, with mutex_ locked
  Status InsertNull(int64_t block_index, int64_t length) {
    value_builder_->Insert(block_index, value_field_, std::make_shared<NullArray>(0));

    ARROW_ASSIGN_OR_RAISE(null_bitmap_chunks_[block_index],
                          AllocateEmptyBitmap(length, pool_));

    int64_t offsets_length = (length + 1) * sizeof(int32_t);
    ARROW_ASSIGN_OR_RAISE(offset_chunks_[block_index],
                          AllocateBuffer(offsets_length, pool_));
    std::memset(offset_chunks_[block_index]->mutable_data(), 0, offsets_length);

    return Status::OK();
  }

  std::mutex mutex_;
  MemoryPool* pool_;