Derby-SQL: Syntax Tree generator?

[Ashwin Jayaprakash]

Hi,
Does anybody know if there is a way to parse and view the AST for an SQL Query in Derby? I looked at the sqlparser.jj in the source code, but couldn't find a way to start it and parse a query without hacking into all the code.

Some thing like this one: http://www.experlog.com/gibello/zql/ ?

I am especially interested in extending the SQL grammar a little bit by adding a few keywords and re-writing some queries issued by the user. So,  some kind of a Visitor-pattern would be nice.

Thanks,
Ashwin (www.JavaForU.com).