Method AppendString

cpp/src/arrow/array/array_union_test.cc:394–398

  }

  virtual void AppendString(const std::string& str) {
    expected_types_vector.push_back(STR);
    ASSERT_OK(union_builder->Append(STR));
    ASSERT_OK(str_builder->Append(str));
  }

  virtual void AppendDouble(double dbl) {
    expected_types_vector.push_back(DBL);