Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/4904#issuecomment-77756049
Hi @marmbrus , it feels hard for me to resolve the base attribute but not
the GetFields that are on top. When we get into `LogicalPlan#resolve`, the
`Attribute`s are all `AttributeReference`, and we don't know whether it's a
base attribute or GetField chain. To make it less hacky, I moved the particular
code to `Analyzer`, is that OK?
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