[hibernate-issues] [Hibernate-JIRA] Created: (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)]

Sybase - Setting FetchMode.JOIN fails if there are 3 or more joins and at least one join involves a union
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                 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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