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From "Lev (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OPENJPA-2317) Criteria API doesn' generate LEFT OUTER JOIN in subquery as expected
Date Fri, 04 Jan 2013 21:30:12 GMT
Lev created OPENJPA-2317:
----------------------------

             Summary: Criteria API doesn' generate LEFT OUTER JOIN in subquery as expected
                 Key: OPENJPA-2317
                 URL: https://issues.apache.org/jira/browse/OPENJPA-2317
             Project: OpenJPA
          Issue Type: Bug
          Components: criteria
    Affects Versions: 2.1.1
         Environment: Windows/Oracle
            Reporter: Lev


I have 3 entity classes classes

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public class DiscoveryObjectImpl implements DiscoveryObject {
	@Id
	private String id;
	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}
}
@Entity
public class VirtualTableImpl extends DiscoveryObjectImpl {
@OneToMany(mappedBy="table")
	private List<ColumnImpl> column = new ArrayList<ColumnImpl>();
}
@Entity
public class ColumnImpl extends DiscoveryObjectImpl {
@ManyToOne(cascade = CascadeType.PERSIST, optional=true)
	VirtualTableImpl table;
}

test code 
public void test() {
		EntityManager em = OpenJPAPersistence.createEntityManagerFactory("Test", "test/persistence.xml").createEntityManager();
        CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery<VirtualTableImpl> cri = cb.createQuery(VirtualTableImpl.class);
        Root<VirtualTableImpl> tbl = cri.from(VirtualTableImpl.class);
        Subquery<Integer> sq = cri.subquery(Integer.class);
        Root<VirtualTableImpl> tbl1 = sq.from(VirtualTableImpl.class);
        Path<ColumnImpl> cols = tbl1.join("column", JoinType.LEFT);
        sq.where(cb.isNull(cols), cb.equal(tbl1, tbl));
        sq.select(cb.literal(new Integer(1)));
        cri.where(cb.exists(sq));
        em.createQuery(cri).getResultList();
}

persistence.xml
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
    version="1.0">
 <persistence-unit name="Test" transaction-type="RESOURCE_LOCAL">
 	<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
 	<class>com.ibm.infosphere.test.model.interfaces.impl.DiscoveryObjectImpl</class>
 	<class>com.ibm.infosphere.test.model.interfaces.impl.VirtualTableImpl</class>
 	<class>com.ibm.infosphere.test.model.interfaces.impl.ColumnImpl</class>
 	<exclude-unlisted-classes>true</exclude-unlisted-classes> 			
	<properties>
			<property name="openjpa.Log" value="DefaultLevel=ERROR, Runtime=ERROR, Tool=ERROR, SQL=TRACE,
MetaData=ERROR"/>
			<property name="openjpa.DynamicEnhancementAgent"  value="false"/>
            <property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>
            <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>
            <property name="openjpa.InitializeEagerly" value="true"/>
            <property name="openjpa.jdbc.DBDictionary" value="oracle"/>
            <property name="openjpa.jdbc.DBDictionary" value="MaxTableNameLength=61"/>
            <property name="openjpa.jdbc.DBDictionary" value="useWildCardForCount=true"/>
            <property name="openjpa.jdbc.DBDictionary" value="JoinSyntax=sql92"/>
 			<property name="openjpa.ConnectionURL" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
			 
    		<property name="openjpa.ConnectionDriverName" value="oracle.jdbc.driver.OracleDriver"/>

      		<property name="openjpa.ConnectionUserName" value="********"/>
      		<property name="openjpa.ConnectionPassword" value="*********"/>

            <property name="openjpa.ConnectionFactoryProperties"    value="PrettyPrint=true,
PrettyPrintLineLength=80, PrintParameters=true"/>
            <property name="openjpa.DataCache"                value="true"/>       

            <property name="openjpa.RemoteCommitProvider"     value="sjvm"/>       
    
            <property name="openjpa.jdbc.QuerySQLCache"       value="true(EnableStatistics=true)"/>
           
		</properties>
</persistence-unit>
</persistence>

The SQL trace is as the following SELECT t2.id 
    FROM VirtualTableImpl t2 
    WHERE (EXISTS (SELECT ? FROM VirtualTableImpl t0 INNER JOIN ColumnImpl t1 ON 
        t0.id = t1.TABLE_ID WHERE (t1.id IS NULL AND t0.id = t2.id))) 

Please note that sub query contains INNER JOIN instead of LEFT OUTER JOIN

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