Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/14367
Hmmm... The rule used by the ANTLR parser only allows underscores and
alphanumeric characters. We support more than that (names containing `$`, `-`,
...) in the old rule. We can support this by surrounding these names with
backticks.
I am wondering how much we need to fix to get this working.
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