Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18576
Changing the usage/semantics of `output` is risky. It could easily break
the existing codes without notice, especially when you do not completely remove
`output` from `QueryPlan`.
Adding nullability as a separate trait that crosses `LogicalPlan` and
`SparkPlan` looks less intrusive.
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