[REF] [IMP] expression.parse: refactored the main parsing loop, now using source and result stacks. Leaf elements are encapsulated into a specific object, allowing to delegate the join condition formation and aliases generation, as well as working_table management to them. The main parsing loop is now a loop taking a leaf, doing one action on it, and putting the result back to be analyzed or in the results. This allows to avoid having while loops inside a main while loop with some weird corner effects.

bzr revid: tde@openerp.com-20121204142650-gkhmjdeu5upi25kp

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