Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20276
> Is this only going to fix the case of joining DataFrames derived from the
same DataFrame but not for self-joining?
Yes. I think self-join is not fixable, `df.join(df, df("id") === (df("id")
+ 1))`, we have no idea what the join condition means. Maybe we should throw
exception for this case.
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