Re: shared_preload_libraries = 'pg_stat_statements' failing with installcheck (compute_query_id = auto)

On Tue, Feb 08, 2022 at 12:56:59PM +0900, Michael Paquier wrote:
> Well, I can see that this is a second independent complain after a few
> months.  If you wish to keep this capability, wouldn't it be better to
> add a "regress" mode to compute_query_id, where we would mask
> automatically this information in the output of EXPLAIN but still run
> the computation?

So, I have been looking at this problem, and I don't see a problem in
doing something like the attached, where we add a "regress" mode to
compute_query_id that is a synonym of "auto". Or, in short, we have
the default of letting a module decide if a query ID can be computed
or not, at the exception that we hide its result in EXPLAIN outputs.

Julien, what do you think?

FWIW, about your question of upthread, I have noticed the behavior
while testing, but I know of some internal customers that enable
pg_stat_statements and like doing tests on the PostgreSQL instance
deployed this way, so that would break.  They are not on 14 yet as far
as I know.
--
Michael