sql query builder widget

This is my first attempt at a re-usable GWT widget. The idea is that
it allows normal users to do intermediate level queries without
needing to know SQL. The widget just needs to be fed meta data to
generate SQL...

I've knocked together a demo:
http://redquerybuilder.appspot.com/

Would this be useful to anybody? What are the biggest features missing/
broken?

Basically I'm wondering if it is worth me bothering with cleaning up
the code etc

Cheers

Sam

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