[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-6042) To much columns in select queries after creating criteria with join

To much columns in select queries after creating criteria with join ------------------------------------------------------------------- Key: HHH-6042 URL: https://hibernate.onjira.com/browse/HHH-6042 Project: Hibernate ORM Issue Type: Bug Components: core Affects Versions: 3.2.6 Environment: <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate</artifactId> <version>3.2.6.ga</version> </dependency> Any database Reporter: Karol Kowalczyk Attachments: AbstractEntityJoinWalker.java, KosztRealizacjiZapytaniaWHibernate.doc, Loader.java When I create criteria for any class with any value of property of association f.e.: java code: eventDCriteria = DetachedCriteria.forClass(Event.class); personDCriteria = eventDCriteria.createCriteria("participants"); personDCriteria.add(Expression.eq("age", 41)); List<Event> events=(List<Event>)getHibernateTemplate().findByCriteria(eventDCriteria, 0, 2); class mappings: <class name="Event" table="EVENTS"> <id name="id" column="EVENT_ID"> <generator class="native"/> </id> <property name="date" type="timestamp" column="EVENT_DATE"/> <property name="title"/> <set name="participants" table="PERSON_EVENT" inverse="true"> <key column="EVENT_ID"/> <many-to-many column="PERSON_ID" class="Person"/> </set> </class> <class name="Person" table="PERSON"> <id name="id" column="PERSON_ID"> <generator class="native"/> </id> <property name="age"/> <property name="firstname"/> <property name="lastname"/> <set name="events" table="PERSON_EVENT" > <key column="PERSON_ID"/> <many-to-many column="EVENT_ID" class="Event"/> </set> <set name="emailAddresses" table="PERSON_EMAIL_ADDR" > <key column="PERSON_ID"/> <element type="string" column="EMAIL_ADDR"/> </set> </class> a Hibernate still creates select query f.e.: select e.EVENT_ID, e.EVENT_DATE, e.title, pe.EVENT_ID, pe.PERSON_ID, p.PERSON_ID, p.age, p.firstname, ... from EVENTS e inner join PERSON_EVENT pe on pe.EVENT_ID=e.EVENT_ID inner join PERSON p on p.PERSON_ID=pe.PERSON_ID where p.age=?; Why this hibernates query have UNNECESSARY list of columns: pe.EVENT_ID, pe.PERSON_ID, p.PERSON_ID, p.age, p.firstname, ...? This query is not INDEXONLY for any databases. More EFFECTIVE query is: select e.EVENT_ID, e.EVENT_DATE, e.title from EVENTS e inner join PERSON_EVENT pe on pe.EVENT_ID=e.EVENT_ID inner join PERSON p on p.PERSON_ID=pe.PERSON_ID where p.age=?; A prepared only for my two changes in hibernate: Loader.java and AbstractEntityJoinWalker.java to get more effective selects.