Re: test_autovacuum/001_parallel_autovacuum is broken

> Optionally, we can change the comment above to something like this:
> # Wait until the parallel autovacuum on the table completes and reports the
> # number of launched workers, which must correspond to the value specified in
> # the reloption.

Made the comment less verbose but in the same spirit as the above.

> > > One way to fix the test is to replace log_contains() with
> > > wait_for_log(). We can also remove wait_for_autovacuum_complete()
> > > logic altogether.
> >
> > +1. I was going to reply with exactly this. Attached is the fix.
>
> Thank you for the patch! I agree with the overall idea. Since we
> enable autovacuum log only the test_autovac table, just checking
> autovacuum log works as expected.
>
> I think we can simplify the test further by removing the logic around
> the av_count variable.

removed av_count and pg_stat_user_tables query, but hardened the
regexp a bit to ensure that the parallel logging is for the test_autovac
table. It gives the same assurance as counting pg_stat_user_tables
and will be better if we add another parallel test table in the future.

--
Sami