Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15575
LGTM, since the scope of this PR is just refactoring.
Let me first post the existing code for `outputPartitioning` in
`ExpandExec`:
```Scala
// The GroupExpressions can output data with arbitrary partitioning, so
set it
// as UNKNOWN partitioning
override def outputPartitioning: Partitioning = UnknownPartitioning(0)
```
It makes sense to set it either `UnknownPartitioning` or
`child.outputPartitioning`. However, the above code is setting to a wrong
number of partitions. We need to correct it no matter whether we are using the
number or not.
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