测试用rust重写的postgresql: pgrust

存储库地址：https://github.com/malisper/pgrust

拉取镜像并运行容器，登录容器。

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C:\Users\lt>wsl
root@DESKTOP-59T6U68:/mnt/c/Users/lt# docker pull docker.1ms.run/malisper/pgrust
Trying to pull docker.1ms.run/malisper/pgrust:latest...
Getting image source signatures
Copying blob 7f391b878ec7 done
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Copying config 31bacc34e0 done
Writing manifest to image destination
Storing signatures
31bacc34e0d1c4804e81670e798d69c0a36bf9722df3815ac17c22fffa076185
root@DESKTOP-59T6U68:/mnt/c/Users/lt#

root@DESKTOP-59T6U68:/mnt/c/Users/lt# docker run -itd --name pgrust -e POSTGRES_PASSWORD=secret docker.1ms.run/malisper/
pgrust
d9f9162dc1e4c096fe2061aaa2a48ea0577fdad5e69bee16980876a47564b05a
root@DESKTOP-59T6U68:/mnt/c/Users/lt# docker exec -it -e PGPASSWORD=secret pgrust psql -h 127.0.0.1 -U postgres
psql (18.4 (Debian 18.4-1.pgdg12+1), server 18.3)
Type "help" for help.

postgres=# select version();
                              version
-------------------------------------------------------------------
 pgrust 18.3 on x86_64-linux-gnu, compiled by clang-21.0.0, 64-bit
(1 row)

测试分组汇总性能。

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postgres=# \timing
Timing is on.

postgres=# with t as (select i/10000 a,i%10000 b from generate_series(1,100000)i) select a,sum(b)c from t group by a order by c,a limit 3;
 a  |    c
----+----------
 10 |        0
  0 | 49995000
  1 | 49995000
(3 rows)

Time: 294.691 ms
postgres=# with t as (select i/10000 a,i%10000 b from generate_series(1,1000000)i) select a,sum(b)c from t group by a order by c,a limit 3;
  a  |    c
-----+----------
 100 |        0
   0 | 49995000
   1 | 49995000
(3 rows)

Time: 2313.454 ms (00:02.313)
--也支持表别名(列别名)的写法。
postgres=# with t as (select i/10000 a,i%10000 b from generate_series(1,1000000)t(i)) select a,sum(b)c from t group by a order by c,a limit 3;
  a  |    c
-----+----------
 100 |        0
   0 | 49995000
   1 | 49995000
(3 rows)

Time: 2252.353 ms (00:02.252)

与PostgreSQL 17.7比较。

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root@DESKTOP-59T6U68:/mnt/c/Users/lt# docker start pg177
pg177
root@DESKTOP-59T6U68:/mnt/c/Users/lt# docker exec -it pg177 bash
root@b3490d8427cd:/# cd /par
root@b3490d8427cd:/par# psql
psql: error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" failed: FATAL:  role "root" does not exist
root@b3490d8427cd:/par# psql -U postgres
psql (17.7 (Debian 17.7-3.pgdg13+1))
Type "help" for help.

postgres=# select version();
                                                      version
--------------------------------------------------------------------------------------------------------------------
 PostgreSQL 17.7 (Debian 17.7-3.pgdg13+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit
(1 row)

postgres=# \timing on
Timing is on.
postgres=# with t as (select i/10000 a,i%10000 b from generate_series(1,100000)i) select a,sum(b)c from t group by a order by c,a limit 3;
 a  |    c
----+----------
 10 |        0
  0 | 49995000
  1 | 49995000
(3 rows)

Time: 30.019 ms
postgres=# with t as (select i/10000 a,i%10000 b from generate_series(1,1000000)i) select a,sum(b)c from t group by a order by c,a limit 3;
  a  |    c
-----+----------
 100 |        0
   0 | 49995000
   1 | 49995000
(3 rows)

Time: 166.758 ms
postgres=# with t as (select i/10000 a,i%10000 b from generate_series(1,10000000)i) select a,sum(b)c from t group by a order by c,a limit 3;
  a   |    c
------+----------
 1000 |        0
    0 | 49995000
    1 | 49995000
(3 rows)

Time: 1649.096 ms (00:01.649)
postgres=#

可见，这个版本的pgrust的SQL语法和计算结果正确，但性能比postgresql差很多倍。