Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/6587#issuecomment-108171706
I agree this change can make things simple and actually I have tried to do
it before... But think about `AttributeReference.withName`, it won't have
effect as the tree node library will regard it as no-change and still keep the
old tree. If `AttributeReference` should not care about the `name`, then we
need to figure out why we need `AttributeReference.withName`.
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