Hi all, I don't know how much is effective or if it's applicable to postgresql processe but it's an interesting article:
http://www.onlamp.com/pub/a/onlamp/2004/10/28/design_by_contract_in_c.html
Regards Gaetano Mendola
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
