Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/11632#issuecomment-194914637
The major problem I see is that now any two DataFrames must be aliased
first before being joined. This breaks existing user code. However, this PR
does solve a more common and subtle problem that is hard to debug, especially
when the join condition is not as trivial as `df("i") === df2("i")`. Our
existing strategy only issues intuitive exception message against trivial
comparisons.
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