> 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?

  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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