kshitij12345 commented on code in PR #14181:
URL: https://github.com/apache/arrow/pull/14181#discussion_r977743042


##########
cpp/src/arrow/compute/kernels/scalar_cast_test.cc:
##########
@@ -2209,6 +2209,39 @@ TEST(Cast, ListToListOptionsPassthru) {
   }
 }
 
+static void CheckFSLToFSL(const std::vector<std::shared_ptr<DataType>>& 
value_types,
+                          const std::string& json_data) {
+  for (const auto& src_value_type : value_types) {
+    for (const auto& dest_value_type : value_types) {
+      const auto src_type = fixed_size_list(src_value_type, 2);
+      const auto dest_type = fixed_size_list(dest_value_type, 2);
+      ARROW_SCOPED_TRACE("src_type = ", src_type->ToString(),
+                         ", dest_type = ", dest_type->ToString());
+      auto src_array = ArrayFromJSON(src_type, json_data);
+      auto dst_array = ArrayFromJSON(dest_type, json_data);
+      CheckCast(src_array, dst_array);
+    }
+  }
+}
+
+TEST(Cast, FSLToFSL) {
+  CheckFSLToFSL({int32(), float32(), int64()}, "[[0, 1], [2, 3], [null, 5]]");

Review Comment:
   I am a bit confused. Can you point to some documentation? Thank you very 
much :)!



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