Hello!

I think I found a bug in Hibernate, in class org.hibernate.hql.ast.HqlParser.

It is in the methtod:

public AST negateNode(AST x)

The switch lacks the node type: EXISTS.

The default negateNode() implementation in org.hibernate.hql.antlr.HqlBaseParser seems to be broken by me, since it does not actually inverts the node but returns a node that is inverted. Or, to be more exact, the negation of OR and AND types are buggy, since they seem to assume that negateNode() will change the node itself, and so they simply discard its return value.

I wish the branch for NOT was not commented out, since it would provide a workaround, but now i'm stuck.

Regards,
Marton