Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15006
Just FYI, the identifier must begin with
Platforma | Specification
---------- | -------------
SQL:2003 Standard| A letter
MySQL| A letter
Oracle| A letter
DB2| A letter
PostgreSQL| A letter or underscore (_)
SQL Server| A letter, underscore (_), at sign (@), or pound sign (#)
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