The model has java.time.YearMonth attributes being mapped to integers on the DB (MariaDB)

Here is how it was used:

@Convert(converter = YearMonthConverter.class)
@Column(name = "month", nullable = false)
private YearMonth month;

And here is the converter class (based on Jakarta now):

public class YearMonthConverter implements AttributeConverter<YearMonth, Integer> {
    @Override
    public Integer convertToDatabaseColumn(YearMonth attribute) {
        return attribute == null ? null : (attribute.getYear() * 100) + attribute.getMonth().getValue();
    }

    @Override
    public YearMonth convertToEntityAttribute(Integer dbData) {
        return dbData == null ? null : YearMonth.of(dbData / 100, dbData % 100);
    }
}

I’ve got a MAX() query on this column which fails with the following error:
org.hibernate.QueryException: Parameter 1 of function max() has type COMPARABLE, but argument is of type java.time.YearMonth

It’s worth noticing that the ORM is able to read/write this column from the DB, it only fails to run functions like MIN or MAX.

The debugging took me to a section of the code in ArgumentTypesValidator where the code considers that the node type YearMonth is incompatible with the FunctionParameterType COMPARABLE.

Let me know if there is anything else that I can provide.