Re: Assumptions about the number of parallel workers

Hi,

On 2020-02-05 10:50:05 +0100, Antonin Houska wrote:
> I can't figure out why ExecGather/ExecGatherMerge do check whether num_workers
> is non-zero. I think the code would be a bit clearer if these tests were
> replaced with Assert() statements, as the attached patch does.

It's probably related to force_parallel_mode. With that we'll IIRC
generate gather nodes even if num_workers == 0.

Greetings,

Andres Freund