Function VerifyCorrectNumberOfWords_FixedWidth

cpp/src/arrow/acero/tpch_node_test.cc:271–291

Same as above but for fixed width columns.

// Same as above but for fixed width columns.
void VerifyCorrectNumberOfWords_FixedWidth(const Datum& d, int num_words,
                                           int byte_width) {
  int expected_num_spaces = num_words - 1;
  int64_t length = d.length();
  const char* str = reinterpret_cast<const char*>(d.array()->buffers[1]->data());

  for (int64_t i = 0; i < length; i++) {
    int actual_num_spaces = 0;
    const char* row = str + i * byte_width;
    bool is_only_alphas_or_spaces = true;
    for (int32_t j = 0; j < byte_width && row[j]; j++) {
      bool is_space = row[j] == ' ';
      actual_num_spaces += is_space;
      is_only_alphas_or_spaces &= (is_space || std::isalpha(row[j]));
    }
    ASSERT_TRUE(is_only_alphas_or_spaces)
        << "Words must be composed only of letters, got " << row;
    ASSERT_EQ(actual_num_spaces, expected_num_spaces)
        << "Wrong number of spaces in " << row;
  }
}

// Verifies that each row of the single-byte-wide column is one of the possibilities.
void VerifyOneOf(const Datum& d, const std::unordered_set<char>& possibilities) {