Re: improve DEBUG1 logging of parallel workers for CREATE INDEX?

> Hmm.  I am reading Tom's opinion that goes toward not going in this
> direction for more commands, with the point to extend EXPLAIN to show
> this kind of information:
> https://www.postgresql.org/message-id/1692530.1736369905@sss.pgh.pa.us

That sounds like the ability to do something like EXPLAIN CREATE INDEX ...
is that correct?

> So do we really want to do what's proposed here?  I'm +-0 about the
> VERBOSE option attached to more commands, as it is a bit harder for
> clients to catch the information wanted. So here comes my question:
> how do we want to consume this information at the end from the
> perspective of the client?

For interactive usage in psql or pgadmin, it's trivial to capture this
information. The
information can also be written to the server log with log_min_messages=INFO

A bit more work is required to redirect messages to an out file from psql, as
you need to ensure that stderr is redirected to a file.
It's also a bit more work to capture this information from something like a
JDBC application.

IMO the interactive use-case is where this is the most useful as you can start a
CREATE INDEX (VERBOSE) and ensure that it's going to launch all the parallel
workers that it planned before letting it it continue; or control-c and figure
out why not all planned workers launched.

Regards,

Sami