Re: [HACKERS] [PATCH] Generic type subscripting

> On 22 February 2018 at 18:30, Dmitry Dolgov <9erthalion6(at)gmail(dot)com> wrote:
>
> Few more updates. I've attached a new version with some minor changes,
> mostly
> about moving a subscripting depth check to type related logic. Also I've
> made
> some performance tests for arrays using pgbench:
>
> pgbench -c 10 -j 2 -T 600 -f test.sql -r
>
> with queries like:
>
> select (ARRAY[1, 2, 3])[0];
> select (ARRAY[1, 2, 3, ..., 98, 99, 100])[0];
> select (ARRAY[[[[[[1]]]]]])[1][1][1][1][1][1];
> select (ARRAY[[[[[[1, 2, 3]]]]]])[1][1][1][1][1:2];
>
> and the difference in average latency was about 2%:
>
> * with the patch
>
> number of transactions actually processed: 349211
> latency average = 1.718 ms
> tps = 5820.048783 (including connections establishing)
> tps = 5820.264433 (excluding connections establishing)
>
> * without the patch
>
> number of transactions actually processed: 356024
> latency average = 1.685 ms
> tps = 5933.538195 (including connections establishing)
> tps = 5934.124599 (excluding connections establishing)
>

One more small update after fd1a421fe6 in attachments.