@Override
    public Class<DateTime> getReturnedClass() {
        return DateTime.class;
    }
{@code DateTimeType} maps {@linkplain org.joda.time.DateTime}
to {@linkplain java.sql.Timestamp} on the JDBC level

@author tiwe
querydsl-sql/src/main/java/com/querydsl/sql/types/DateTimeType.java