Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/6587#issuecomment-111233662
I am strongly opposed to these changes. In a previous version of catalyst
we had the equality function for `AttributeReference` not include other things
like the name and the qualifiers and it resulted in even more confusing bugs.
I think @cloud-fan 's performance concerns are also valid.
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