SQL Server. We use SQLServer2008Dialect specifically.

The issue is in org.hibernate.criterion.SimpleExpression.java in toSqlString where the sqlTypes comparison is only against VARCHAR and CHAR and doesn't include NVARCHAR and NCHAR.

https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src/main/java/org/hibernate/criterion/SimpleExpression.java#L92