Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19218
@fjh100456 We have priority for three different inputs. Here, you just
consider one of three. Please also add the extra checks. Hopefully,
@dongjoon-hyun can help you answer your questions. He just finished the work in
https://github.com/apache/spark/pull/19055
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