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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">Hi,</p> <p style="margin: 10px 0 0">I thought I would add the output of my test in case I described it weirdly. </p> <p style="margin: 10px 0 0">Here is the code I run (without the where clause): </p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
TypedQuery<Holder> q = em.createQuery(<span class="code-quote" style="color: #009100">"SELECT h from HibernateTest$Holder h LEFT JOIN FETCH TREAT (h.list AS HibernateTest$B) e"</span>, Holder.class);
List<Holder> resultList = q.getResultList();
resultList.stream().flatMap( x-> x.list.stream()).forEach(x -> <span class="code-object" style="color: #910091">System</span>.err.println(x.getClass().getName()));
</pre>
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</div> <p style="margin: 10px 0 0">This is the output I get (in full):</p>
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14:45:04.766 [main] DEBUG o.h.h.i.QueryTranslatorFactoryInitiator - QueryTranslatorFactory : org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory@3a60c416
14:45:04.766 [main] INFO o.h.h.i.QueryTranslatorFactoryInitiator - HHH000397: Using ASTQueryTranslatorFactory
14:45:04.792 [main] DEBUG o.h.h.i.ast.QueryTranslatorImpl - parse() - HQL: SELECT h from test.pandaadb.HibernateTest$Holder h LEFT JOIN FETCH TREAT (h.list AS HibernateTest$B) e
14:45:04.796 [main] DEBUG o.h.hql.internal.ast.HqlParser - Registering discovered request to treat(h.list as HibernateTest$B)
14:45:04.798 [main] DEBUG o.h.h.i.ast.QueryTranslatorImpl - --- HQL AST ---
\-[QUERY] Node: 'query'
\-[SELECT_FROM] Node: 'SELECT_FROM'
+-[FROM] Node: 'from'
| +-[RANGE] Node: 'RANGE'
| | +-[DOT] Node: '.'
| | | +-[DOT] Node: '.'
| | | | +-[IDENT] Node: 'test'
| | | | \-[IDENT] Node: 'pandaadb'
| | | \-[IDENT] Node: 'HibernateTest$Holder'
| | \-[ALIAS] Node: 'h'
| \-[JOIN] Node: 'JOIN'
| +-[LEFT] Node: 'LEFT'
| +-[FETCH] Node: 'FETCH'
| +-[DOT] Node: '.'
| | +-[IDENT] Node: 'h'
| | \-[IDENT] Node: 'list'
| \-[ALIAS] Node: 'e'
\-[SELECT] Node: 'SELECT'
\-[IDENT] Node: 'h'
14:45:04.799 [main] DEBUG o.h.hql.internal.ast.ErrorCounter - throwQueryException() : no errors
14:45:04.814 [main] DEBUG o.h.h.i.antlr.HqlSqlBaseWalker - select << begin [level=1, statement=select]
14:45:04.822 [main] DEBUG o.h.h.internal.ast.tree.FromElement - FromClause{level=1} : test.pandaadb.HibernateTest$Holder (h) -> hibernatet0_
14:45:04.823 [main] DEBUG o.h.h.i.ast.tree.FromReferenceNode - Resolved : h -> hibernatet0_.holderId
14:45:04.824 [main] DEBUG o.h.hql.internal.ast.tree.DotNode - getDataType() : list -> org.hibernate.type.BagType(test.pandaadb.HibernateTest$Holder.list)
14:45:04.825 [main] DEBUG o.h.h.i.ast.tree.FromElementFactory - createEntityAssociation() : One to many - path = h.list role = test.pandaadb.HibernateTest$Holder.list associatedEntityName = test.pandaadb.HibernateTest$A
14:45:04.826 [main] DEBUG o.h.h.internal.ast.tree.FromElement - FromClause{level=1} : test.pandaadb.HibernateTest$A (e) -> list1_
14:45:04.826 [main] DEBUG o.h.hql.internal.ast.tree.FromClause - addJoinByPathMap() : h.list -> FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=e,role=<span class="code-keyword" style="color: #000091">null</span>,tableName=HibernateTest$A,tableAlias=list1_,origin=HibernateTest$Holder hibernatet0_,columns={hibernatet0_.holderId ,className=test.pandaadb.HibernateTest$A}}
14:45:04.826 [main] DEBUG o.h.hql.internal.ast.tree.DotNode - dereferenceCollection() : Created <span class="code-keyword" style="color: #000091">new</span> FROM element <span class="code-keyword" style="color: #000091">for</span> h.list : HibernateTest$A list1_
14:45:04.826 [main] DEBUG o.h.h.i.ast.tree.FromReferenceNode - Resolved : h.list -> .
14:45:04.827 [main] DEBUG o.h.hql.internal.ast.HqlSqlWalker - createFromJoinElement() : -- join tree --
\-[JOIN_FRAGMENT] FromElement: 'HibernateTest$A list1_' FromElement{explicit,not a collection join,fetch join,fetch non-lazy properties,classAlias=e,role=test.pandaadb.HibernateTest$Holder.list,tableName=HibernateTest$A,tableAlias=list1_,origin=HibernateTest$Holder hibernatet0_,columns={hibernatet0_.holderId ,className=test.pandaadb.HibernateTest$A}}
14:45:04.827 [main] DEBUG o.h.h.i.ast.tree.FromReferenceNode - Resolved : h -> hibernatet0_.holderId
14:45:04.828 [main] DEBUG o.h.h.i.antlr.HqlSqlBaseWalker - select : finishing up [level=1, statement=select]
14:45:04.828 [main] DEBUG o.h.hql.internal.ast.HqlSqlWalker - processQuery() : ( SELECT ( {select clause} hibernatet0_.holderId ) ( FromClause{level=1} ( HibernateTest$Holder hibernatet0_ HibernateTest$A list1_ ) ) )
14:45:04.832 [main] DEBUG o.h.h.i.ast.util.JoinProcessor - Using FROM fragment [HibernateTest$Holder hibernatet0_]
14:45:04.832 [main] DEBUG o.h.h.i.ast.util.JoinProcessor - Using FROM fragment [left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$A list1_ on hibernatet0_.holderId=list1_.subclassId left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$C list1_1_ on list1_.id=list1_1_.id left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$B list1_2_ on list1_.id=list1_2_.id]
14:45:04.833 [main] DEBUG o.h.h.i.antlr.HqlSqlBaseWalker - select >> end [level=1, statement=select]
14:45:04.833 [main] DEBUG o.h.h.i.ast.QueryTranslatorImpl - --- SQL AST ---
\-[SELECT] QueryNode: 'SELECT' querySpaces (HibernateTest$Holder,HibernateTest$A)
+-[SELECT_CLAUSE] SelectClause: '{select clause}'
| +-[ALIAS_REF] IdentNode: 'hibernatet0_.holderId as holderId1_3_0_' {alias=h, className=test.pandaadb.HibernateTest$Holder, tableAlias=hibernatet0_}
| +-[SELECT_EXPR] SelectExpressionImpl: 'list1_.id as id1_0_1_' {FromElement{explicit,not a collection join,fetch join,fetch non-lazy properties,classAlias=e,role=test.pandaadb.HibernateTest$Holder.list,tableName=HibernateTest$A,tableAlias=list1_,origin=HibernateTest$Holder hibernatet0_,columns={hibernatet0_.holderId ,className=test.pandaadb.HibernateTest$A}}}
| +-[SQL_TOKEN] SqlFragment: 'list1_.subclassId as subclass2_0_1_, list1_1_.prop2 as prop1_2_1_, list1_2_.prop1 as prop1_1_1_, <span class="code-keyword" style="color: #000091">case</span> when list1_1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 1 when list1_2_.id is not <span class="code-keyword" style="color: #000091">null</span> then 2 when list1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 0 end as clazz_1_'
| \-[SQL_TOKEN] SqlFragment: 'list1_.subclassId as subclass2_0_0__, list1_.id as id1_0_0__'
\-[FROM] FromClause: 'from' FromClause{level=1, fromElementCounter=2, fromElements=2, fromElementByClassAlias=[e, h], fromElementByTableAlias=[hibernatet0_, list1_], fromElementsByPath=[h.list], collectionJoinFromElementsByPath=[], impliedElements=[]}
\-[FROM_FRAGMENT] FromElement: 'HibernateTest$Holder hibernatet0_' FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=h,role=<span class="code-keyword" style="color: #000091">null</span>,tableName=HibernateTest$Holder,tableAlias=hibernatet0_,origin=<span class="code-keyword" style="color: #000091">null</span>,columns={,className=test.pandaadb.HibernateTest$Holder}}
\-[JOIN_FRAGMENT] FromElement: 'left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$A list1_ on hibernatet0_.holderId=list1_.subclassId left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$C list1_1_ on list1_.id=list1_1_.id left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$B list1_2_ on list1_.id=list1_2_.id' FromElement{explicit,not a collection join,fetch join,fetch non-lazy properties,classAlias=e,role=test.pandaadb.HibernateTest$Holder.list,tableName=HibernateTest$A,tableAlias=list1_,origin=HibernateTest$Holder hibernatet0_,columns={hibernatet0_.holderId ,className=test.pandaadb.HibernateTest$A}}
14:45:04.833 [main] DEBUG o.h.hql.internal.ast.ErrorCounter - throwQueryException() : no errors
14:45:04.838 [main] DEBUG o.h.h.i.ast.QueryTranslatorImpl - HQL: SELECT h from test.pandaadb.HibernateTest$Holder h LEFT JOIN FETCH TREAT (h.list AS HibernateTest$B) e
14:45:04.838 [main] DEBUG o.h.h.i.ast.QueryTranslatorImpl - SQL: select hibernatet0_.holderId as holderId1_3_0_, list1_.id as id1_0_1_, list1_.subclassId as subclass2_0_1_, list1_1_.prop2 as prop1_2_1_, list1_2_.prop1 as prop1_1_1_, <span class="code-keyword" style="color: #000091">case</span> when list1_1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 1 when list1_2_.id is not <span class="code-keyword" style="color: #000091">null</span> then 2 when list1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 0 end as clazz_1_, list1_.subclassId as subclass2_0_0__, list1_.id as id1_0_0__ from HibernateTest$Holder hibernatet0_ left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$A list1_ on hibernatet0_.holderId=list1_.subclassId left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$C list1_1_ on list1_.id=list1_1_.id left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$B list1_2_ on list1_.id=list1_2_.id
14:45:04.838 [main] DEBUG o.h.hql.internal.ast.ErrorCounter - throwQueryException() : no errors
14:45:04.846 [main] DEBUG org.hibernate.SQL - select hibernatet0_.holderId as holderId1_3_0_, list1_.id as id1_0_1_, list1_.subclassId as subclass2_0_1_, list1_1_.prop2 as prop1_2_1_, list1_2_.prop1 as prop1_1_1_, <span class="code-keyword" style="color: #000091">case</span> when list1_1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 1 when list1_2_.id is not <span class="code-keyword" style="color: #000091">null</span> then 2 when list1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 0 end as clazz_1_, list1_.subclassId as subclass2_0_0__, list1_.id as id1_0_0__ from HibernateTest$Holder hibernatet0_ left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$A list1_ on hibernatet0_.holderId=list1_.subclassId left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$C list1_1_ on list1_.id=list1_1_.id left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$B list1_2_ on list1_.id=list1_2_.id
Hibernate: select hibernatet0_.holderId as holderId1_3_0_, list1_.id as id1_0_1_, list1_.subclassId as subclass2_0_1_, list1_1_.prop2 as prop1_2_1_, list1_2_.prop1 as prop1_1_1_, <span class="code-keyword" style="color: #000091">case</span> when list1_1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 1 when list1_2_.id is not <span class="code-keyword" style="color: #000091">null</span> then 2 when list1_.id is not <span class="code-keyword" style="color: #000091">null</span> then 0 end as clazz_1_, list1_.subclassId as subclass2_0_0__, list1_.id as id1_0_0__ from HibernateTest$Holder hibernatet0_ left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$A list1_ on hibernatet0_.holderId=list1_.subclassId left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$C list1_1_ on list1_.id=list1_1_.id left <span class="code-keyword" style="color: #000091">outer</span> join HibernateTest$B list1_2_ on list1_.id=list1_2_.id
14:45:04.848 [main] DEBUG org.hibernate.loader.Loader - Result set row: 0
14:45:04.848 [main] DEBUG org.hibernate.loader.Loader - Result row: EntityKey[test.pandaadb.HibernateTest$Holder#cee5414c-6d12-4080-994c-eb2c8b2721c9], EntityKey[test.pandaadb.HibernateTest$A#69d1383a-3b88-4781-b894-03f226f40e52]
14:45:04.848 [main] DEBUG org.hibernate.loader.Loader - Found row of collection: [test.pandaadb.HibernateTest$Holder.list#cee5414c-6d12-4080-994c-eb2c8b2721c9]
14:45:04.848 [main] DEBUG org.hibernate.loader.Loader - Result set row: 1
14:45:04.848 [main] DEBUG org.hibernate.loader.Loader - Result row: EntityKey[test.pandaadb.HibernateTest$Holder#cee5414c-6d12-4080-994c-eb2c8b2721c9], EntityKey[test.pandaadb.HibernateTest$A#26e18799-8fce-4e74-8236-bcbfad1d15ab]
14:45:04.849 [main] DEBUG org.hibernate.loader.Loader - Found row of collection: [test.pandaadb.HibernateTest$Holder.list#cee5414c-6d12-4080-994c-eb2c8b2721c9]
14:45:04.849 [main] DEBUG org.hibernate.loader.Loader - Result set row: 2
14:45:04.849 [main] DEBUG org.hibernate.loader.Loader - Result row: EntityKey[test.pandaadb.HibernateTest$Holder#cee5414c-6d12-4080-994c-eb2c8b2721c9], EntityKey[test.pandaadb.HibernateTest$A#f9e43150-f1a3-4112-8059-2f785aa8d5d7]
14:45:04.849 [main] DEBUG org.hibernate.loader.Loader - Found row of collection: [test.pandaadb.HibernateTest$Holder.list#cee5414c-6d12-4080-994c-eb2c8b2721c9]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Resolving associations <span class="code-keyword" style="color: #000091">for</span> [test.pandaadb.HibernateTest$Holder#cee5414c-6d12-4080-994c-eb2c8b2721c9]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Done materializing entity [test.pandaadb.HibernateTest$Holder#cee5414c-6d12-4080-994c-eb2c8b2721c9]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Resolving associations <span class="code-keyword" style="color: #000091">for</span> [test.pandaadb.HibernateTest$A#69d1383a-3b88-4781-b894-03f226f40e52]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Done materializing entity [test.pandaadb.HibernateTest$A#69d1383a-3b88-4781-b894-03f226f40e52]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Resolving associations <span class="code-keyword" style="color: #000091">for</span> [test.pandaadb.HibernateTest$B#26e18799-8fce-4e74-8236-bcbfad1d15ab]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Done materializing entity [test.pandaadb.HibernateTest$B#26e18799-8fce-4e74-8236-bcbfad1d15ab]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Resolving associations <span class="code-keyword" style="color: #000091">for</span> [test.pandaadb.HibernateTest$C#f9e43150-f1a3-4112-8059-2f785aa8d5d7]
14:45:04.849 [main] DEBUG o.h.engine.internal.TwoPhaseLoad - Done materializing entity [test.pandaadb.HibernateTest$C#f9e43150-f1a3-4112-8059-2f785aa8d5d7]
14:45:04.849 [main] DEBUG o.h.e.l.i.CollectionLoadContext - 1 collections were found in result set <span class="code-keyword" style="color: #000091">for</span> role: test.pandaadb.HibernateTest$Holder.list
14:45:04.849 [main] DEBUG o.h.e.l.i.CollectionLoadContext - Collection fully initialized: [test.pandaadb.HibernateTest$Holder.list#cee5414c-6d12-4080-994c-eb2c8b2721c9]
14:45:04.849 [main] DEBUG o.h.e.l.i.CollectionLoadContext - 1 collections initialized <span class="code-keyword" style="color: #000091">for</span> role: test.pandaadb.HibernateTest$Holder.list
test.pandaadb.HibernateTest$A
test.pandaadb.HibernateTest$B
test.pandaadb.HibernateTest$C
test.pandaadb.HibernateTest$A
test.pandaadb.HibernateTest$B
test.pandaadb.HibernateTest$C
test.pandaadb.HibernateTest$A
test.pandaadb.HibernateTest$B
test.pandaadb.HibernateTest$C
</pre>
</div>
</div> <p style="margin: 10px 0 0">I think the repetition of the objects is due to the nature of the join, however you can see that all objects regardless of the type defined are represented. </p> <p style="margin: 10px 0 0">vs, with the WHERE clause I get:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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test.pandaadb.HibernateTest$B
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</div> <p style="margin: 10px 0 0">Regards,</p> <p style="margin: 10px 0 0">Artur</p> </td>
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