Class Key

cpp/src/arrow/dataset/partition.h:176–179

  /// An unconverted equality expression consisting of a field name and the representation
  /// of a scalar value
  struct Key {
    std::string name;
    std::optional<std::string> value;
  };

  Result<PartitionedBatches> Partition(
      const std::shared_ptr<RecordBatch>& batch) const override;