If we add that information to EXPLAIN output, the user won't need
access to server logs.
May be we need it in both the places.
On Tue, May 10, 2022 at 6:35 AM KAWAMOTO Masaya <kawamoto@sraoss.co.jp> wrote:
>
> Hi,
>
> During query tuning, users may want to check if GEQO is used or not
> to generate a plan. However, users can not know it by simply counting
> the number of tables that appear in SQL. I know we can know it by
> enabling GEQO_DEBUG flag, but it needs recompiling, so I think it is
> inconvenient.
>
> So, I would like to propose to add a debug level message that shows
> when PostgreSQL use GEQO. That enables users to easily see it by
> just changing log_min_messages.
>
> Use cases are as follows:
> - When investigating about the result of planning, user can determine
> whether the plan is chosen by the standard planning or GEQO.
>
> - When tuning PostgreSQL, user can determine the suitable value of
> geqo_threshold parameter.
>
> Best regards.
>
> --
> KAWAMOTO Masaya <kawamoto@sraoss.co.jp>
> SRA OSS, Inc. Japan
--
Best Wishes,
Ashutosh Bapat
