[C++][Parquet] Key-value metadata is not preserved in the sub-fields of map type

[wgtmac]

Describe the bug, including details regarding any error messages, version, and platform.

The code below does not deal with map type, which ends up with missing key-value metadata of key and value fields.

std::function<std::shared_ptr<::arrow::DataType>(FieldVector)> GetNestedFactory(
    const ArrowType& origin_type, const ArrowType& inferred_type) {
  switch (inferred_type.id()) {
    case ::arrow::Type::STRUCT:
      if (origin_type.id() == ::arrow::Type::STRUCT) {
        return [](FieldVector fields) { return ::arrow::struct_(std::move(fields)); };
      }
      break;
    case ::arrow::Type::LIST:
    case ::arrow::Type::LARGE_LIST:
      if (origin_type.id() == ::arrow::Type::LIST) {
        return [](FieldVector fields) {
          DCHECK_EQ(fields.size(), 1);
          return ::arrow::list(std::move(fields[0]));
        };
      }
      if (origin_type.id() == ::arrow::Type::LARGE_LIST) {
        return [](FieldVector fields) {
          DCHECK_EQ(fields.size(), 1);
          return ::arrow::large_list(std::move(fields[0]));
        };
      }
      if (origin_type.id() == ::arrow::Type::FIXED_SIZE_LIST) {
        const auto list_size =
            checked_cast<const ::arrow::FixedSizeListType&>(origin_type).list_size();
        return [list_size](FieldVector fields) {
          DCHECK_EQ(fields.size(), 1);
          return ::arrow::fixed_size_list(std::move(fields[0]), list_size);
        };
      }
      break;
    default:
      break;
  }
  return {};
}

Component(s)

C++, Parquet

[wgtmac]

Issue resolved by pull request 49218
#49218