I am using fluentnhibernate.mapping my data can not come out

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C#

Trying join table process_log and table visit but didnt show a data
personal is the relationship column

mapping

Table("process");
Id(x => x.process_date, "date");
Map(x => x.personal_id, "personal");
Map(x => x.exam_started_on, "started_on");

// Map(x => x.error_msg, "error_msg");
Join("visit ", v =>
{
    v.Fetch.Join();
    v.KeyColumn("personal");
    v.Map(t => t.record_id, "record_id");
});

dateexameList = session.CreateCriteria<DateExamLog>()
            .Add(Expression.Eq("started", Examdate))
            .Add(Expression.Or(
                  Expression.Eq("personal", nric),
                  Expression.IsNull("personal")))
            .CreateCriteria("Patron", "patron", JoinType.LeftOuterJoin)
            .CreateCriteria("personal", "personal", JoinType.LeftOuterJoin)
            .List<DateExamLog>();

What I have tried:

I try google but can not find wat is worng