cloud-fan commented on PR #45552:
URL: https://github.com/apache/spark/pull/45552#issuecomment-2025219523
@zhengruifeng can you take a look? I think we should make this work. We can
find `df("b")` in both join sides, but this is a special case as `df("b")`
directly comes from the right join side. I don't want to make the algorithm
very complicated like searching column references from both sides and calculate
the depth, but this simple special case is not ambiguous.
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