problème dans l'agregat SUM dans hql

bonjour ;
dans ma requete hql j'ai utilisé dans l'argument du SUM un test le voici :

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select ....,SUM(if(tab.champ1='valeur' ,1,0)) ,.. from tab ..;

la champs champ1 est du type String ;
a l'execeution une exception se declenche et en voici le code

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xception in thread "main" java.lang.IllegalStateException: No data type for node: org.hibernate.hql.ast.tree.AggregateNode 
 +-[AGGREGATE] AggregateNode: 'SUM'
 |  \-[METHOD_CALL] MethodNode: '('
 |     +-[METHOD_NAME] IdentNode: 'IF' {originalText=IF}
 |     \-[EXPR_LIST] SqlNode: 'exprList'
 
        at org.hibernate.hql.ast.tree.SelectClause.initializeExplicitSelectClause(SelectClause.java:140)
        at org.hibernate.hql.ast.HqlSqlWalker.useSelectClause(HqlSqlWalker.java:702)
        at org.hibernate.hql.ast.HqlSqlWalker.processQuery(HqlSqlWalker.java:531)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:645)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229)
        at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:218)
        at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:158)
        at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:109)
        at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:75)
        at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:54)
        at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:71)
        at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
        at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
        at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1583)

merci pour votre aide