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Summary
PR #6385 added MySQL 8.4 support by extending the list of reserved keywords. MySQL 8.4 freed up several keywords as well.
https://dev.mysql.com/doc/refman/8.4/en/keywords.html#keywords-removed-in-current-series
This PR removes the freed keywords from the list.
Branch 3.9.x was targeted to stay in line with #6385 given that there hasn't been a new release yet either.