Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21449
My point is that, we may have a different design if we wanna solve this
problem holistically, which may conflict with this patch. We should prove that
this is in the right direction and future fix will not conflict with it, or
come out with the final fix directly.
An example is, we may want to treat `df.join(df, df("id") >= df("id"))` as
invalid in the final design.
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