On Sun, Feb 3, 2019 at 2:45 PM Saul, Jean Paolo
<paolo.saul@verizonconnect.com> wrote:
> The last post was too long. I think I have a much more simpler example that is easier to replicate.
This new example is very similar to examples that I have personally
come up with. I have no difficulty explaining why the case with lots
of duplicates is slower, so it doesn't really help.
I cannot account for why you can observe a difference across Postgres
versions, though -- that's what I'm having difficulty with. Are you
sure about that effect? There haven't been any directly relevant
changes in this area in many years.
--
Peter Geoghegan