Re: pgstat_report_activity() and parallel CREATE INDEX (was: Parallel index creation & pg_stat_activity)

On Tue, Oct 13, 2020 at 7:26 PM Noah Misch <noah@leadboat.com> wrote:
> 1. Disable parallelism for the index build under ExecuteTruncateGuts().
>    Nobody will mourn a performance loss from declining parallelism for an
>    empty index, but I feel like this is fixing in the wrong place.
> 2. Make _bt_begin_parallel() and begin_parallel_vacuum() recognize the
>    debug_query_string==NULL case and reproduce it on the worker.
> 3. Require bgworkers to set debug_query_string before entering code of vacuum,
>    truncate, etc.  Logical replication might synthesize a DDL statement, or it
>    might just use a constant string.
>
> I tend to prefer (2), but (3) isn't bad.  Opinions?

I also prefer 2.

Thanks
-- 
Peter Geoghegan