Since the Version 6.2.4 the sql is wrong if you have follwing
* Oracle DB
* EntityA
* EntityB
* EntityA has many-to-one relationship to EntityB
* you select distinct EntityA.entityB and sets max results to something e.g. 2
Configuration
{code:xml} <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle12cDialect"/>
<property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver"/>{code}
Real Example with Testcase attached
hql:
{code:java}var list = em.createQuery("select distinct a.entityB from EntityA a ", EntityA.class)
.setMaxResults(2)
.getResultList();{code}
h2. Produced sql was correct in 6.2.1, 6.2.3
{code:sql}select * from (select distinct e2_0.tableBId c0 from TABLE_A e1_0 join TABLE_B e2_0 on e2_0.tableBId=e1_0.tableBId) where rownum<=?{code}
h2. Since 6.2.4 the produces SQL is wrong (!)
{code:sql}select * from (select distinct e2_0.tableBId c0,rownum rn from TABLE_A e1_0 join TABLE_B e2_0 on e2_0.tableBId=e1_0.tableBId) r_0_ where r_0_.rn<=? order by r_0_.rn{code}
this is wrong because if you include rownum as column and distinct over it then all rows will become unique even the real duplicates |
|
