Github user cammachusa commented on the issue:
https://github.com/apache/spark/pull/18423
It's such a pain when you register your table's name as "MyTempTable", and
later in your code you want to check if your table still exists by the same
string "MyTempTable", but spark says "No". Now, you start figuring out what's
going wrong with your code, and may spend a ton of time for it. And at the end,
you realize it's Spark's bug, and that you need to convert it to lower case.
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