Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/11521#issuecomment-192370105
Or we can mark `QueryPlan.expressions` as `final`, so that it's always
consistent with `QueryPlan.transformExpressions`. `Generate` is the only one
that override `expressions()`, and it can override `producedAttributes`
instead, which will be a small change.
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