| From: | 'Alvaro Herrera' <alvherre(at)alvh(dot)no-ip(dot)org> |
|---|---|
| To: | "k(dot)jamison(at)fujitsu(dot)com" <k(dot)jamison(at)fujitsu(dot)com> |
| Cc: | Craig Ringer <craig(dot)ringer(at)enterprisedb(dot)com>, Matthieu Garrigues <matthieu(dot)garrigues(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: PATCH: Batch/pipelining support for libpq |
| Date: | 2021-03-04 01:51:08 |
| Message-ID: | 20210304015108.GA15670@alvherre.pgsql |
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| Thread: | |
| Lists: | pgsql-hackers |
On 2021-Mar-03, 'Alvaro Herrera' wrote:
> On 2021-Mar-03, 'Alvaro Herrera' wrote:
>
> > This should obviously not occur. I'm trying to figure out how to repair
> > it and not break everything again ...
>
> I think trying to set up the connection state so that the next query
> appears in conn->last_query prior to PQgetResult being called again
> leads to worse breakage. The simplest fix seems to make fe-protocol3.c
> aware that in this case, the query is in conn->cmd_queue_head instead,
> as in the attached patch.
I wonder if it would make sense to get rid of conn->last_query
completely and just rely always on conn->cmd_queue_head, where the
normal (non-pipeline) would use the first entry of the command queue.
That might end up being simpler than pipeline mode "pretending" to take
over ->last_query.
--
Álvaro Herrera 39°49'30"S 73°17'W
"La verdad no siempre es bonita, pero el hambre de ella sí"
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