Github user aray commented on the pull request:
https://github.com/apache/spark/pull/11632#issuecomment-200515122
While this may help with join ambiguity. I think the more fundamental
problem is that a transformed DataFrame should not be giving the same column
references as the original. For an example where this is still a problem even
with this patch see @wesm recent blog post
http://wesmckinney.com/blog/compiling-dataframe-code/
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