Re: Add a GUC check hook to ensure summarize_wal cannot be enabled when wal_level is minimal

On Wed, 10 Jul 2024 at 16:18, Nathan Bossart <nathandbossart@gmail.com> wrote:
> Yeah.  I initially thought this patch might be okay, at least as a stopgap,
> but Jelte pointed out a case where it doesn't work, namely when you have
> something like the following in the config file:
>
>         wal_level = 'minimal'
>         summarize_wal = 'true'
>         wal_level = 'logical'

I think that issue can be solved fairly easily by making the guc
check_hook always pass during postmaster startup (by e.g. checking
pmState), and relying on the previous startup check instead during
startup.