Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21449
@daniel-shields in that case you have 2 different datasets `df1` and `df2`.
So they are 2 distinct attributes and the check `a.sameRef(b)` would return
false. This is applied only in case you have self-joins, ie. you have the same
dataset on both sides.
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