Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/11632#issuecomment-200589654
cc @maropu @aray , yea, we can do better for this problem, this PR is just
step 1. We can alias every DataFrame so that transformed DataFrame won't give
the same column references as the original. But it requires more changes and
I'd like to do it a follow-ups
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