Class SelectiveIpcFileRecordBatchGenerator

cpp/src/arrow/ipc/reader.cc:1347–1360

A generator of record batches for use when reading a subset of columns from the file. All batches are yielded in order.

///
/// All batches are yielded in order.
class SelectiveIpcFileRecordBatchGenerator {
 public:
  using Item = std::shared_ptr<RecordBatch>;

  explicit SelectiveIpcFileRecordBatchGenerator(
      std::shared_ptr<RecordBatchFileReaderImpl> state)
      : state_(std::move(state)), index_(0) {}

  Future<Item> operator()();

 private:
  std::shared_ptr<RecordBatchFileReaderImpl> state_;
  int index_;
};

class RecordBatchFileReaderImpl : public RecordBatchFileReader {
 public: