Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22029
BTW it will be great if this behavior is defined by the SQL standard. And
we should also check the big data SQL systems like Hive and Presto. In general
we should be careful for uncertain behaviors like this. That said, I feel
returing false is not that wrong to me without considering other systems.
also cc @gatorsmile
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