lidavidm commented on code in PR #13009:
URL: https://github.com/apache/arrow/pull/13009#discussion_r860912317


##########
cpp/src/arrow/stl_iterator_test.cc:
##########
@@ -248,5 +248,216 @@ TEST(ArrayIterator, StdMerge) {
   ASSERT_EQ(values, expected);
 }
 
+TEST(ChunkedArrayIterator, Basics) {
+  auto chunk0 = ArrayFromJSON(int32(), "[4, 5, null]");
+  auto chunk1 = ArrayFromJSON(int32(), "[6]");
+
+  ASSERT_OK_AND_ASSIGN(auto result, ChunkedArray::Make({chunk0, chunk1}, 
int32()));
+  auto it = Iterate<Int32Type>(*result);
+  optional<int32_t> v = *it;
+  ASSERT_EQ(v, 4);
+  ASSERT_EQ(it[0], 4);
+  ++it;
+  ASSERT_EQ(it[0], 5);
+  ASSERT_EQ(*it, 5);
+  ASSERT_EQ(it[1], nullopt);
+  ASSERT_EQ(it[2], 6);

Review Comment:
   Ah I see now, 
https://en.cppreference.com/w/cpp/iterator/random_access_iterator includes 
"array notation with subscripting" (I was scanning the code snippets not the 
text).



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