criteria on association w/ fetch=join, get n+1 queries ------------------------------------------------------ Key: HHH-4865 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4865 Project: Hibernate Core Issue Type: Bug Components: query-criteria Affects Versions: 3.2.7 Environment: Hibernate 3.2.7.ga Reporter: Kevin Howard Priority: Minor When I specify a restriction on an one-to-many association in a criteria query, Hibernate executes n+1 queries even though the first query is joining the two tables correctly with an inner join. This happens if I use createAlias or createCriteria to specify the restriction on the association. If I don't specify a restriction on the association then I do not get n+1 queries and the association is populated. This seems like a bug as all the data is returned in the initial query and the following queries are not needed. I posted this in the forum (https://forum.hibernate.org/viewtopic.php?f=1&t=1002270) with no response. Criteria Query: final DetachedCriteria criteria = DetachedCriteria.forClass(A.class); criteria.add(Restrictions.eq("column1", value1)) .createAlias("someSetofB", "h") .add(Restrictions.in("h.code", new String[] {"A","B","C"})); final List<A> list = getHibernateTemplate().findByCriteria(criteria); Association Mapping: <set name="someSetofB" lazy="false" fetch="join"> <key> <column name="SOME_ID" /> </key> <one-to-many class="B" /> </set> SQL: select ..(every column from A and B).. from A this_ inner join B h1_ on this_.SOME_ID=h1_.SOME_ID where this_.COLUMN_ONE=? and h1_.CODE in (?, ?, ?) select .... from B someSetOfB0_ where someSetOfB0_.SOME_ID=? select .... from B someSetOfB0_ where someSetOfB0_.SOME_ID=? ..... selects for as many A's returned by first query -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira