Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12138#issuecomment-208168423
Yea, and in this PR we use `NamedExpression` to avoid re-using child's
output, which should work. My proposal is that, we can use placeholders(maybe
`BoundReference`) to reference child's output, and define an `output` method in
`Expand` that replace the placeholder with child attribute. I haven't looked
through all cases, but if this proposal can work, it should be simpler to
implement.
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