Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/12138#issuecomment-208240385
We may not talk the same thing. Not the change of child output causes
problem. We create new attributes in `Expand`. But we use child's output as
`Expand`'s output.
For example, if the child output is [a, b, c]. Currently we set it as
`Expand`'s output too.
But when we do a roll up, we may set a, b, c to null. But our output in
Expand doesn't reflect this change.
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