Method ScanBatch

cpp/src/arrow/dataset/file_json.cc:74–77

  int NumBatches() override { return num_batches_; }

  Future<std::shared_ptr<RecordBatch>> ScanBatch(int index) override {
    DCHECK_EQ(num_scanned_++, index);
    return reader_->ReadNextAsync();
  }

  int64_t EstimatedDataBytes(int) override { return block_size_; }