[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6151) HQL with joins in sub-select creates wrong SQL (copy of NH-2648)

[Harald M. Müller (JIRA)]

HQL with joins in sub-select creates wrong SQL (copy of NH-2648)
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                 Key: HHH-6151
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6151
             Project: Hibernate Core
          Issue Type: Bug
          Components: query-hql
    Affects Versions: 3.6.3
         Environment: Hib 3.6.3 final; SQL Server 2008
            Reporter: Harald M. Müller
            Priority: Critical
         Attachments: HQL_MissingJoinInExists.zip

The following query is translated to wrong SQL - the join is missing from the sub-select:

		s.createQuery( 
				"SELECT ROOT FROM hmm.Sheet AS ROOT " +
				"WHERE (EXISTS (FROM hmm.Shelf AS inv " +
				"               left JOIN ROOT.Folder AS ROOT_Folder " +
				"               WHERE (((ROOT_Folder.Shelf) = (inv) AND inv.Id = 1)) )) " +
				"      AND ROOT.Name = 'SomeName'").list();

(The query was created by a HQL generator of ours - hence the superfluous parentheses). The inner exception is:

Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The multi-part identifier "folder2_.Shelf" could not be bound.
	at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:196)
	at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServerStatement.java:1454)
...
	at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeQuery(SQLServerPreparedStatement.java:281)
	at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
...	at org.hibernate.loader.Loader.doList(Loader.java:2533)
	... 30 more

and the (wrong) SQL is 

declare @p1 int
set @p1=0
exec sp_prepexec @p1 output,NULL,N'select sheet0_.Id as Id2_, sheet0_.Name as Name2_, sheet0_.Folder as Folder2_ from Sheet sheet0_ where (exists (select shelf1_.Id from Shelf shelf1_ where folder2_.Shelf=shelf1_.Id and shelf1_.Id=1)) and sheet0_.Name=''SomeName'''
select @p1

----

Since NHib 0.99 and in Hibernate, it has been possible to use joins inside subqueries. HQL allows it, and therefore, it should produce correct SQL (both syntactically and semantically). Actually, joins in subqueries are *necessary* if there are OR or NOT operators inside the subquery (some simpler queries can be rewritten with all Joins at top-level).

I consider this bug critical because there is no workaround for

* HQL generated for earlier NHib versions
* manual HQL that needs OR or NOT inside a subquery
* (I assume) the correct translation of Linq's .Any in the NHib.Linq provider

I have attached a test case that shows the behavior. 

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