Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/9548#issuecomment-155217297
That particular example does not really seem like a problem to me. Its the
same column logically that you are dropping.
What if we make the change in the Column API only, instead of trying to
change `AttributeReference`. Perhaps we can assign a globally unique ID to any
Dataframe (similar to expression ID). This can be optionally added to any
column that is created directly from a dataframe.
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