Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1977#issuecomment-91081544
Sorry for my initial confusion regarding the external lists of lists. I
think that the `__len__` thing might be an issue if we ever directly expose
`ExternalListOfList` to users, but it looks like we currently only expose it
through a `ChainedIterable` in this code, so it doesn't appear to be a problem
yet. This still might be worth addressing if you agree that it could help
prevent future bugs if we start using this in more places.
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