Hi everyone!

We recently have made upgrade from 2.1.8 to 3.3.1 hibernate.
It works fine.

But how we know (http://www.hibernate.org/250.html#A33) hibernate has 2 modes for query translator:
- org.hibernate.hql.ast.ASTQueryTranslatorFactory, for the new query parser
- org.hibernate.hql.classic.ClassicQueryTranslatorFactory for the old parser.


Now we use ClassicQueryTranslatorFactory and our old queries work.

Please help me understand the following:
1) Which new facilities of hibernate3 can not we use
if we don't migrate on ASTQueryTranslatorFactory?
2) Can you clarify the impact to 3.2 stability/behavior/performance if we don't make this change?

Thanks all for help.