Class Builder

cpp/src/arrow/record_batch_test.cc:1319–1346

Result<std::shared_ptr<Array>> BuildArray(const std::vector<ValueType>& values,
                                          const std::shared_ptr<DataType>& array_type) {
  struct Builder {
    const std::vector<ArrayStatistics::ValueType>& values;
    const std::shared_ptr<DataType>& array_type;
    explicit Builder(const std::vector<ArrayStatistics::ValueType>& values,
                     const std::shared_ptr<DataType>& array_type)
        : values(values), array_type(array_type) {}

    Result<std::shared_ptr<Array>> operator()(const bool&) {
      auto raw_values = StatisticsValuesToRawValues<bool>(values);
      return BuildArray<BooleanType>(raw_values);
    }
    Result<std::shared_ptr<Array>> operator()(const int64_t&) {
      auto raw_values = StatisticsValuesToRawValues<int64_t>(values);
      return BuildArray<Int64Type>(raw_values);
    }
    Result<std::shared_ptr<Array>> operator()(const uint64_t&) {
      auto raw_values = StatisticsValuesToRawValues<uint64_t>(values);
      return BuildArray<UInt64Type>(raw_values);
    }
    Result<std::shared_ptr<Array>> operator()(const double&) {
      auto raw_values = StatisticsValuesToRawValues<double>(values);
      return BuildArray<DoubleType>(raw_values);
    }
    Result<std::shared_ptr<Array>> operator()(const std::string&) {
      auto raw_values = StatisticsValuesToRawValues<std::string>(values);
      return BuildArray(array_type, raw_values);
    }
  } builder(values, array_type);
  return std::visit(builder, values[0]);
}