Marti Raudsepp <marti@juffo.org> writes:
> This is just a small clarity improvement. tuplesort_performsort()
> skips sorting entirely when the result set has 0 or 1 tuples, but
> EXPLAIN still says it's using "quicksort". The patch changes that to
> "skipped"
I'm not convinced this is an improvement; it's just one more value
to confuse people with. And any implementation of quicksort is likely
to have a fast exit path for 0 or 1 item, so I don't think the existing
display is incorrect either.
regards, tom lane