Function Join

cpp/src/arrow/util/iterator_test.cc:401–407

}

Iterator<TestInt> Join(TestInt a, TestInt b) {
  std::vector<Iterator<TestInt>> joined{2};
  joined[0] = VectorIt({a});
  joined[1] = VectorIt({b});

  return FlattenIt(VectorIt(std::move(joined)));
}

Iterator<TestInt> Join(TestInt a, Iterator<TestInt> b) {
  std::vector<Iterator<TestInt>> joined{2};