| From: | "Andrey V(dot) Lepikhov" <a(dot)lepikhov(at)postgrespro(dot)ru> |
|---|---|
| To: | Etsuro Fujita <etsuro(dot)fujita(at)gmail(dot)com> |
| Cc: | Zhihong Yu <zyu(at)yugabyte(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Defer selection of asynchronous subplans until the executor initialization stage |
| Date: | 2021-08-30 08:36:38 |
| Message-ID: | 8891e9b4-040f-6d71-fa63-3069046dfb3d@postgrespro.ru |
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| Lists: | pgsql-hackers |
On 8/23/21 2:18 PM, Etsuro Fujita wrote:
> To just execute what was planned at execution time, I think we should
> return to the patch in [1]. The patch was created for Horiguchi-san’s
> async-execution patch, so I modified it to work with HEAD, and added a
> simplified version of your test cases. Please find attached a patch.
> [1] https://www.postgresql.org/message-id/7fe10f95-ac6c-c81d-a9d3-227493eb9055@postgrespro.ru
I agree, this way is more safe. I tried to search for another approach,
because here isn't general solution: for each plan node we should
implement support of asynchronous behaviour.
But for practical use, for small set of nodes, it will work good. I
haven't any objections for this patch.
--
regards,
Andrey Lepikhov
Postgres Professional
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