Smarter Joins - One instead of Two
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Key: EJB-423
URL:
http://opensource.atlassian.com/projects/hibernate/browse/EJB-423
Project: Hibernate Entity Manager
Issue Type: Improvement
Components: EntityManager
Affects Versions: 3.3.1.GA
Environment: Hibernate with PostgreSQL
Reporter: Bradford
Priority: Minor
I have CompanyLocation that has a station property as ManyToOne with Station.
StationLocale has a station property as ManyToOne with Station. I created a OneToMany
relationship in Station that's called localizedStation.
If I write the following:
left join colocs.station.localizedStation as sl
It creates two left joins when it gets converted to SQL:
left outer join stations station4_
on companyloc0_.station_code=station4_.code
left outer join station_locales localizeda5_
on station4_.code=localizeda5_.station_code
This is a waste. Shouldn't it be smart enough to generate the following:
left outer join station_locales localizeda5_
on companyloc0_.station_code=localizeda5_.station_code
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