Github user pepinoflo commented on the issue: https://github.com/apache/spark/pull/21208 Sorry about the commit history above, I forgot `-p` option during a `git rebase`. All my changes are really only in this commit: 471597a. It includes quite a bit of refactoring compared to my first solution, as I have decided to follow the flatten and concat functions' implementation structure (a method for the number of elements, one for primitive and one for non primitive types); hopefully it also addresses all the previous comments.
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