Horton

Re: How to prohibit parallel scan through tableam?

Rafia Sabih <rafia.pghackers@gmail.com>

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From: Rafia Sabih <rafia.pghackers@gmail.com>
To: Konstantin Knizhnik <k.knizhnik@postgrespro.ru>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2019-11-27T12:12:35Z
Lists: pgsql-hackers 
On Wed, 27 Nov 2019 at 12:33, Konstantin Knizhnik <k.knizhnik@postgrespro.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.

-- 
Regards,
Rafia Sabih