[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-1499) use subselect fetching for collection join fetches with DISTINCT or firstResult/maxRows

use subselect fetching for collection join fetches with DISTINCT or firstResult/maxRows --------------------------------------------------------------------------------------- Key: HHH-1499 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1499 Project: Hibernate3 Type: Improvement

Components: query-hql Reporter: Steve Ebersole Assignee: Steve Ebersole Fix For: hql+collection

As a follow on to HHH-1411and HHH-1412... Both of those above were actually resolved by handling the DISTINCT-ion and/or firstResult/maxRows *in memory*. A better solution is to not honor the join fetch in these cases, perform the requested operation, and then get the requested join fectehd collections through subselect fetches. As is, this would work as long as the collections have subselect fetching enabled in metadata, but would actually use immediate fetching (n+1) for any collections not defining subselect fetching in metadata. This is due to the way PersistenceContext.initializeNonLazyCollections() currently works.