[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3684) Sybase - Setting FetchMode.JOIN fails if there are 3 or more joins and at least one join involves a union

[Gail Badner (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32049#action_32049 ] 

Gail Badner commented on HHH-3684:
----------------------------------

https://jira.jboss.org/jira/browse/JBPAPP-1545

> Sybase - Setting FetchMode.JOIN fails if there are 3 or more joins and at least one join involves a union
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-3684
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3684
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>            Reporter: Gail Badner
>            Assignee: Gail Badner
>
> This is reproduced by UnionSubclassTest.testUnionSubclassFetchMode().. 
> This may be due to a bug in Sybase. A similar problem is discussed here:
> http://www.forumtopics.com/busobj/viewtopic.php?p=442226&sid=40bd96248c52fa6193686f4288f19a4c
> For the unit test mentioned above, changing:
> select ...
> from ( select ... from humans 
>             union 
>          select ... from employees ) this_ 
> inner join locations location2_ 
>   on this_.location=location2_.id 
> left outer join ( select ... from employees 
>                          union 
>                       select ... from humans 
>                          union 
>                       select ... from aliens ) beings3_ 
>   on location2_.id=beings3_.location
> :
> to:
> select ...
> from ( select ... from humans 
>             union 
>          select ... from employees ) this_ 
> inner join (locations location2_ 
> left outer join ( select ... from employees 
>                          union 
>                       select ... from humans 
>                          union 
>                       select ... from aliens ) beings3_ 
>   on location2_.id=beings3_.location)
> : on this_.location=location2_.id 
> fixes the problem.
> This changer is similar to what is documented for a "right-nested outer join" at  http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc32300.1502/html/sqlug/sqlug170.htm.

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