> To sum up, I am looking for a (decently efficient) scheme that is able to
> (1) pass arbitrary conditional expressions from WHERE to the executor in a structure preserving way.
> (2) annotate arbitrary expressions with weights that survive on its way from the parser to the executor.
> (3) access the logical value of particular subexpressions.
> I have some basic ideas how at least some of the requirements might be achieved. But as I am not totally satisfied with my ideas I hope you can provide me with some fresh input.
Why? What are you trying to achieve?
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