Re: pgsql: Fix search_path to a safe value during maintenance operations.

On Fri, 2023-06-09 at 17:37 -0700, Jeff Davis wrote:
> Attached a patch to mark those functions as PARALLEL UNSAFE, which
> fixes the problem.

On second thought, that might not be acceptable for amcheck, depending
on how its run.

I think it's OK if run by pg_amcheck, because that runs it on a single
index at a time in each connection, and parallelizes by opening more
connections.

But if some users are calling the check functions across many tables in
a single select statement (e.g. in the targetlist of a query on
pg_class), then they'll experience a regression.

> Alternatively, I could just take out that line, as those SQL
> functions
> are not controlled by the MAINTAIN privilege. But for consistency I
> think it's a good idea to leave it in so that index functions are
> called with the right search path for amcheck.

If marking them PARALLEL UNSAFE is not acceptable, then this seems like
a fine solution.

Regards,
    Jeff Davis