[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5301) Add support for parametrizing TYPE(e) expressions

[Luis Fernando Planella Gonzalez (JIRA)]

Add support for parametrizing TYPE(e) expressions
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                 Key: HHH-5301
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5301
             Project: Hibernate Core
          Issue Type: Bug
          Components: query-hql
    Affects Versions: 3.5.2
         Environment: Hibernate 3.5.2, Java 6.0.20
            Reporter: Luis Fernando Planella Gonzalez


Support parameters for JPA 2's TYPE(alias) function.

Test classes:

@Entity
@DiscriminatorColumn(name="subclass")
@Table(name="xs")
public abstract class XBase {
    @Id
    private Integer id;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
}
@Entity
@DiscriminatorValue("x1")
public class X1 extends XBase {
    @Basic
    private String x1;
    public String getX1() {
        return x1;
    }
    public void setX1(String x1) {
        this.x1 = x1;
    }
}
@Entity
@DiscriminatorValue("x2")
public class X2 extends XBase {
    @Basic
    private String x2;
    public String getX2() {
        return x2;
    }
    public void setX2(String x2) {
        this.x2 = x2;
    }
}

Running the following query works: "select x from XBase x where type(x) = X1"
However, the following one: "select x from XBase x where type(x) = :t" yelds
Exception in thread "main" java.lang.UnsupportedOperationException: At the moment this type is not the one actually used to map the discriminator.
	at org.hibernate.persister.entity.DiscriminatorType.nullSafeSet(DiscriminatorType.java:111)
	at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:67)
	at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:567)
	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1612)
	at org.hibernate.loader.Loader.doQuery(Loader.java:717)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
	at org.hibernate.loader.Loader.doList(Loader.java:2294)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2172)
	at org.hibernate.loader.Loader.list(Loader.java:2167)
	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:448)
	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363)
	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1258)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
	at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:241)
	at test.Main.main(Main.java:28)

JPA 2's spec explicitly shows querying by type using parameters in section 4.6.17.4.

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