Support Future for collection filters

Currently, Future<> doesn't work on CreateFilter.

I have a class:

public class Tag .... //not important

Mapping for User – the Tags part:

If I do this:

Error:
NHibernate.Hql.Ast.ANTLR.QuerySyntaxException: Exception of type 'Antlr.Runtime.MismatchedTreeNodeException' was thrown. [].

Error from log:
ERROR NHibernate.Hql.Parser - MismatchedTreeNodeException(3!=2)