Github user tejasapatil commented on the issue:
https://github.com/apache/spark/pull/15575
@viirya : As per my understanding, if the child operator emits `col`, after
applying `ExpandExec`, the output is `col'`. The original child partitioning
being over `col`, `ExpandExec` does not seem to alter that.
The table above was to summarise the state of things before this PR. I did
not change any semantics in this PR as its pure refactoring.
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