Function ASSERT_OK_AND_ASSIGN

cpp/src/arrow/csv/reader_test.cc:172–174

  const int NROWS = 1000;
#endif
  ASSERT_OK_AND_ASSIGN(auto table_buffer, MakeSampleCsvBuffer(NROWS, [=](size_t row_num) {
                         return row_num != NROWS / 2;
                       }));

  std::vector<Future<std::shared_ptr<Table>>> task_futures(NTASKS);
  for (int i = 0; i < NTASKS; i++) {