For Oracle, the real max limit for identifiers is 30. The getMaxAliasLength of 20 ought to be better than before and still fit under 30 after we have added uniquing info.
{{org.hibernate.dialect.Dialect#getMaxAliasLength}} is the maximum length before uniquing info is added to the alias. Typically this number ought to be 10 or more less than the real max for the database.
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