Github user srowen commented on the issue: https://github.com/apache/spark/pull/22318 Oh I see there was indeed more discussion on this, and it does relate to resolving columns to joined DataFrames. I don't know enough to bless this change, but it seems reasonable. @maropu approves, I think, and so does @mgaido91 ? what about @cloud-fan @viirya ? It seems like it's behavior that can be improved but isn't strictly a correctness issue? because it's not quite valid to reference columns from dataframes not involved in the join as a join condition, right?
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