I wrote:
> To get the buildfarm back to green, I agree with the suggestion of
> setting force_parallel_mode=off for this test, at least for now.
Actually, there's an easier way: we can just make the test table be
TEMP. That is a good idea anyway to prevent possible interference
from auto-analyze, which conceivably could come along at just the
wrong time and cause a plan change.
regards, tom lane