Re: How to prohibit parallel scan through tableam?

On 27.11.2019 15:12, Rafia Sabih wrote:
>
>
> On Wed, 27 Nov 2019 at 12:33, Konstantin Knizhnik
> <k(dot)knizhnik(at)postgrespro(dot)ru <mailto:k(dot)knizhnik(at)postgrespro(dot)ru>> wrote:
>
> Hi hackers,
>
> I wonder how it is possible to prohibit parallel scan for the
> external
> storage accessed through tableam?
> For example if I want to implement specialized tableam for fast
> access
> to temp tables, how can I inform optimizer that
> parallel scan is not possible (because table data is local to the
> backend)?
>
>  How about setting parallel_setup_cost to disable_cost in costsize.c
> for your specific scan method.

How can I do it if i just implementing my AM and not going to change any
postgres code?

--
Konstantin Knizhnik
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company