Dmitry Tkach <[EMAIL PROTECTED]> writes:
> The problem is that in the 'real life' situation the condition is a lot 
> more complicated than this simple is null test... I hate having to 
> duplicate it, and I hate even more having to evaluate it twice on every 
> insert :-(

Why evaluate it twice?  The DO INSTEAD NOTHING rule should be
unconditional.

                        regards, tom lane

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