| From: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
|---|---|
| To: | 'Pavel Stehule' <pavel(dot)stehule(at)gmail(dot)com> |
| Cc: | Erik Rijkers <er(at)xs4all(dot)nl>, Michael Paquier <michael(at)paquier(dot)xyz>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | RE: Schema variables - new implementation for Postgres 15 |
| Date: | 2021-04-15 16:02:45 |
| Message-ID: | TYAPR01MB299061DBBFF5C2EBBD307F7FFE4D9@TYAPR01MB2990.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
--------------------------------------------------
do $$
declare x int ;
begin
for i in 1..1000000
loop
let ooo = i;
end loop;
end;
$$;
variant 1 .. 1500 ms
variant 2 with PLpgSQL support .. 140 ms
variant 2 without PLpgSQL support 9000 ms
--------------------------------------------------
That's impressive! But 1 million times of variable assignment took only 140 ms? It's that one assignment took only 140 nanosecond, which is near one DRAM access? Can PL/pgSQL processing be really so fast?
Regards
Takayuki Tsunakawa
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