Sub-query as function parameter - either sub-query is missed from SQL or NullPointerException raised ---------------------------------------------------------------------------------------------------- Key: HHH-1643 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1643 Project: Hibernate Core Issue Type: Bug Components: query-hql Affects Versions: 3.1.2, 3.1.3 Environment: Hibernate 3.1.2 MS SQL Server 2K Reporter: Andy Shelton Attachments: hql-sql.patch The HQL grammar HQL (hql.g) allows expressions and sub-queries as parameters to functions, however the SQL Tree Transform grammar (hql-sql.g) does not, it only allows expressions. This means if you pass a sub-query as a parameter to something like "cast" for example, you will get a NullPointerException. In other cases, typically the sub-query is missed out of the resulting SQL. This is easily remedied by changing the first line of the definition of functionCall within hql-sql.g from: functionCall : #(METHOD_CALL {inFunctionCall=true;} pathAsIdent ( #(EXPR_LIST (expr)* ) )? ) to: functionCall : #(METHOD_CALL {inFunctionCall=true;} pathAsIdent ( #(EXPR_LIST (exprOrSubquery)* ) )? ) This modification has been tested against all the existing UnitTests in Hibernate 3.1.2 and does not cause any problems. I've included a patch for this.