Github user peter-toth commented on the issue:
https://github.com/apache/spark/pull/22318
Thanks @viirya, your analysis is correct.
Unfortunately an attribute doesn't have a reference to its dataset so I
don't think this scenario can be solved easily. I believe the good solution
would be something like https://github.com/apache/spark/pull/21449
But I would argue that my PR still does make sense and an `a("id") ===
b("id")` condition in a join where `c` is joined is not expected, and actually
very likely a typo.
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