Re: POC: GROUP BY optimization

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От Tom Lane
Тема Re: POC: GROUP BY optimization
Дата
Msg-id 2426725.1703653643@sss.pgh.pa.us
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Ответ на Re: POC: GROUP BY optimization  (Andrei Lepikhov <a.lepikhov@postgrespro.ru>)
Ответы Re: POC: GROUP BY optimization
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Andrei Lepikhov <a.lepikhov@postgrespro.ru> writes:
> To be clear. In [1], I mentioned we can perform micro-benchmarks and 
> structure costs of operators. At least for fixed-length operators, it is 
> relatively easy.

I repeat what I said: this is a fool's errand.  You will not get
trustworthy results even for the cases you measured, let alone
all the rest.  I'd go as far as to say I would not believe your
microbenchmarks, because they would only apply for one platform,
compiler, backend build, phase of the moon, etc.

            regards, tom lane



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