[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3631) HQL grammar does not actually support the CASE statement

[Andra Nedelcovici (JIRA)]

HQL grammar does not actually support the CASE statement
--------------------------------------------------------

                 Key: HHH-3631
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3631
             Project: Hibernate Core
          Issue Type: Bug
          Components: query-hql
    Affects Versions: 3.3.1
         Environment: Hibernate 3.3.1 ga, Postgresql
            Reporter: Andra Nedelcovici


Using a simple form of the CASE statement in HQL like the following

from EnumerationValue where enumeration = 'XXX' and (case :param
	when 1 then value > 5
	when 2 then value < 100
	else true
end) order by id

yields

org.hibernate.hql.ast.QuerySyntaxException: unexpected AST node: case near line 1, column 54 [...]
	at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
	at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)
	at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:82)
	at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:258)
	at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:183)
	at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:134)
	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
	at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)
	at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
	at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
	at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1650) ...

I also tried this (silly, isn't it?):

from EnumerationValue where enumeration = 'XXX' and (1=1 and case 3
	when 1 then false
	when 2 then true
	else true
end) order by id

in order to check for HQL grammar limitations, but the result is just the same.
I should also mention that I ran successfully the above queries in a PostgreSQL console (with the normal adjustments).

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira