| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru> |
| Cc: | Alexander Korotkov <aekorotkov(at)gmail(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Teodor Sigaev <teodor(at)sigaev(dot)ru>, David Rowley <dgrowleyml(at)gmail(dot)com>, "a(dot)rybakina" <a(dot)rybakina(at)postgrespro(dot)ru>, Белялов Дамир Наилевич <d(dot)belyalov(at)postgrespro(dot)ru> |
| Subject: | Re: POC: GROUP BY optimization |
| Date: | 2023-12-27 05:07:23 |
| Message-ID: | 2426725.1703653643@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(dot)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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