Method Finish

cpp/src/arrow/dataset/partition.cc:644–656

  }

  Result<std::shared_ptr<Partitioning>> Finish(
      const std::shared_ptr<Schema>& schema) const override {
    for (FieldRef ref : field_names_) {
      // ensure all of field_names_ are present in schema
      RETURN_NOT_OK(ref.FindOne(*schema).status());
    }

    // drop fields which aren't in field_names_
    auto out_schema = SchemaFromColumnNames(schema, field_names_);

    return std::make_shared<FilenamePartitioning>(std::move(out_schema), dictionaries_,
                                                  options_.AsPartitioningOptions());
  }

 private:
  void Reset() override {