LiaCastaneda commented on issue #17405:
URL: https://github.com/apache/datafusion/issues/17405#issuecomment-3253500284
> The qualification happens by stripping the inner DFSchema of its current
qualification and applying the new one (e.g. TableReference::bar("left")).
During this re-qualification, columns with duplicate names are handled in a
very hacky way by appending a :{N} where N is a unique number for that column.
Just wanted to mention the `:N` qualification is done when one side of the
join has duplicates itself (not when the resulting joined schema has
duplicates). Ideally we would want to keep the sides to keep left and right
bearing I think
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