Function GetBuffer

cpp/src/arrow/array/data.h:629–639

  std::shared_ptr<Array> ToArray() const;

  std::shared_ptr<Buffer> GetBuffer(int index) const {
    const BufferSpan& buf = this->buffers[index];
    if (buf.owner) {
      return *buf.owner;
    } else if (buf.data != NULLPTR) {
      // Buffer points to some memory without an owning buffer
      return std::make_shared<Buffer>(buf.data, buf.size);
    } else {
      return NULLPTR;
    }
  }

  void SetSlice(int64_t offset, int64_t length) {
    this->offset = offset;