Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15668
It looks to me that after this PR, we still have literals in expand, can
you call `df.explain(true)` to double check the query plan?
and how about this?
https://github.com/apache/spark/compare/master...cloud-fan:showcase?expand=1
It's a little simpler and do avoid puting literals in expand.
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