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
