notfilippo commented on issue #17405:
URL: https://github.com/apache/datafusion/issues/17405#issuecomment-3254394561

   My understanding is that the `:1` is added to make sure DFSchema uniqueness 
property is respected with regards to column names. I would argue that 
potentially we could move that differentiation to the `TableReference` 
qualification. In the repro above something like `alias.right.a` would be way 
better than `alias.a:1`.


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