I was going through this issue https://jira.mariadb.org/browse/MDEV-34228,
and noticed that during parsing we check if '_' is present in a token , if
it does it is parsed as an identifier.

My question here is to follow a SQL2023 standard of '_' in numeric
literals, how would one go distinguishing the difference between numeric
literals and identifiers ? mariadb documentation says that a identifier
cannot start with a number until its in backticks `{identifier}`.

Rohan Gupta
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