Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22373
> I think we should allow `struct` function to take empty arguments.
Yes, I agree @cloud-fan. At least until 3.0 IMHO. But since the change was
already released in 3.0, I was not sure whether to revert that additional check
or add this logic here. If nobody objects, I'd switch to remove the check,
since this would also prevent other users's workflows to potentially break
having a regression.
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