NHibernate联接子类实体的简单集合

<class name=\"ResultItem\" table=\"result\">

  <id name=\"ID\">
    <generator class=\"identity\" />
  </id>

  <many-to-one name=\"Job\" column=\"JobID\"/>
  <property name=\"Timestamp\"/>
  <many-to-one name=\"User\" column=\"UserID\"/>

  <joined-subclass name=\"ResultItemAttachment\" table=\"result_attachment\">
    <key column=\"ID\"/>
    <property name=\"Comment\"/>
  </joined-subclass>

</class>

SELECT attachment0_.JobID as JobID1_,
       attachment0_.ID as ID1_,
       attachment0_.ID as ID26_0_,
       attachment0_1_.JobID as JobID26_0_,
       attachment0_1_.`Timestamp` as Timestamp26_0_,
       attachment0_1_.UserID as UserID26_0_,
       attachment0_.`Comment` as Comment33_0_
FROM result_attachment attachment0_
inner join result attachment0_1_ on attachment0_.ID=attachment0_1_.ID
WHERE attachment0_1_.JobID=?;