Re: let's make the list of reportable GUCs configurable (was Re: Add %r substitution for psql prompts to show recovery status)

Andres Freund <andres@anarazel.de> writes:
> On 2019-10-11 16:30:17 -0400, Robert Haas wrote:
>> But, if it does need to be changed, it seems like a terrible idea to
>> allow it to be done via SQL. Otherwise, the user can break the driver
>> by using SQL to set the list to something that the driver's not
>> expecting, and there's nothing the driver can do to prevent it.

> Uhm. The driver can just ignore GUCs it's not interested in, like our
> docs have told them for a long time?

Certainly it should do that; but the problematic case is where it
*doesn't* get told about something it's depending on knowing about.

            regards, tom lane