On Fri, Mar 19, 2021 at 12:53:18PM -0400, Bruce Momjian wrote:
>
> Well, given we don't really want to support multiple query id types
> being generated or displayed, the "error out" above should fix it.
>
> Let's do this --- tell extensions to error out if the query id is
> already set, either by compute_query_id or another extension. If an
> extension wants to generate its own query id and store is internal to
> the extension, that is fine, but the server-displayed query id should be
> generated once and never overwritten by an extension.
Agreed, this will ensure that you won't dynamically change the queryid source.
We should also document that changing it requires a restart and calling
pg_stat_statements_reset() afterwards.
v19 adds some changes, plus extra documentation for pg_stat_statements about
the requirement for a queryid to be calculated, and a note that all documented
details only apply for in-core source. I'm not sure if this is still the best
place to document those details anymore though.
