Function PrintDatum

cpp/src/arrow/compute/expression.cc:128–152

namespace {

std::string PrintDatum(const Datum& datum) {
  if (datum.is_scalar()) {
    if (!datum.scalar()->is_valid) return "null[" + datum.type()->ToString() + "]";

    switch (datum.type()->id()) {
      case Type::STRING:
      case Type::LARGE_STRING:
        return '"' +
               Escape(std::string_view(*datum.scalar_as<BaseBinaryScalar>().value)) + '"';

      case Type::BINARY:
      case Type::FIXED_SIZE_BINARY:
      case Type::LARGE_BINARY:
        return '"' + datum.scalar_as<BaseBinaryScalar>().value->ToHexString() + '"';

      default:
        break;
    }

    return datum.scalar()->ToString();
  } else if (datum.is_array()) {
    return "Array[" + datum.type()->ToString() + "]";
  }
  return datum.ToString();
}

}  // namespace