Since PostgreSQL started down that road for so many other relations, I
think many people just expect this to happen as a logical extension. 

It certainly makes life a lot easier in combination with build
management systems. 


On 2014-09-30 16:43, Tom Lane wrote: 

> =?UTF-8?Q?Fabr=C3=ADzio_de_Royes_Mello?= <> writes:
>> What's your thoughts about we implement IF NOT EXISTS for CREATE INDEX?
> It's got the same semantic problems as every other variant of CINE.
> If there were a huge groundswell of demand for it, maybe we'd hold our
> noses and do it anyway. But I'm against doing it without that.
> regards, tom lane


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