Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/17241
@jiangxb1987 I am not entirely sure about the usefulness of this (I thought
it might be good to enforce some restriction when we wrote the design doc). I
don't think it matters much what we do from an end user perspective: either
analysis succeeds or it fails, only the error message is slightly different.
WDYT?
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