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https://issues.apache.org/jira/browse/OPENJPA-189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12484775
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Marc Prud'hommeaux commented on OPENJPA-189:
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If you just execute the subquery by itself, does it return any results?
Also, can you enable SQL logging and post the SQL that is executed when you run
the subquery?
> EXISTS conditional operator and subquery don't return values, but they do
> exist
> -------------------------------------------------------------------------------
>
> Key: OPENJPA-189
> URL: https://issues.apache.org/jira/browse/OPENJPA-189
> Project: OpenJPA
> Issue Type: Bug
> Components: query
> Affects Versions: 0.9.7
> Reporter: Jacek Laskowski
>
> The test says it all. When the line where the condition is checked is removed
> the test fails with Apache OpenJPA 0.9.7-SNAPSHOT.
> public void testExists() {
> Query query = em.createQuery("SELECT DISTINCT p FROM Projekt p WHERE
> EXISTS (SELECT zaleznosc FROM Projekt zaleznosc WHERE zaleznosc MEMBER OF
> p.zaleznosci AND zaleznosc.rodzajProjektu =
> pl.jaceklaskowski.jpa.entity.RodzajProjektu.OTWARTY)");
> // Apache OpenJPA 0.9.7-SNAPSHOT workaround so the test passes
> // TopLink Essentials 2.0 BUILD 40 i Hibernate EntityManager 3.3.0.GA
> work fine
> if
> (!em.getClass().getCanonicalName().equals("org.apache.openjpa.persistence.EntityManagerImpl"))
> {
> List<Projekt> projekty = query.getResultList();
> assert projekty.size() == 1 : projekty.size() + " projects received";
> assert projekty.get(0).getNazwa().equals("Apache Geronimo") : "Should
> be 'Apache Geronimo', but was " + projekty.get(0).getNazwa();
> }
> }
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