Horton

Re: Schema variables - new implementation for Postgres 15

Pavel Stehule <pavel.stehule@gmail.com>

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From: Pavel Stehule <pavel.stehule@gmail.com>
To: "tsunakawa.takay@fujitsu.com" <tsunakawa.takay@fujitsu.com>
Cc: Erik Rijkers <er@xs4all.nl>, Michael Paquier <michael@paquier.xyz>, Amit Kapila <amit.kapila16@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Tom Lane <tgl@sss.pgh.pa.us>, Alvaro Herrera <alvherre@2ndquadrant.com>, Robert Haas <robertmhaas@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2021-04-15T16:11:40Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Allow underscores in integer and numeric constants.

  2. Remove special outfuncs/readfuncs handling of RangeVar.catalogname.

  3. Remove extra space from dumped ALTER DEFAULT PRIVILEGES.

  4. Create FKs properly when attaching table as partition

  5. psql: improve tab-complete's handling of variant SQL names.

čt 15. 4. 2021 v 18:02 odesílatel tsunakawa.takay@fujitsu.com <
tsunakawa.takay@fujitsu.com> napsal:

> From: Pavel Stehule <pavel.stehule@gmail.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?
>

In this case the PLpgSQL can be very fast - and after changes in pg 13, the
PLpgSQL is not significantly slower than Lua or than PHP.

Every body can repeat these tests - I did it on my Lenovo T520 notebook

Pavel



>
>
>
> Regards
>
> Takayuki Tsunakawa
>
>
>