Method GetColumn

cpp/src/parquet/arrow/reader.cc:261–263

                   std::unique_ptr<ColumnReader>* out);

  Status GetColumn(int i, std::unique_ptr<ColumnReader>* out) override {
    return GetColumn(i, AllRowGroupsFactory(), out);
  }

  Status GetSchema(std::shared_ptr<::arrow::Schema>* out) override {
    return FromParquetSchema(reader_->metadata()->schema(), reader_properties_,