On Thu, Jul 22, 2021 at 8:45 AM Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > That is ... weird. Maybe you have found a bug in the spill-to-disk logic; > it's quite new after all. Can you extract a self-contained test case that > behaves this way? I wonder if this has something to do with the way that the input data is clustered. I recall noticing that that could significantly alter the behavior of HashAggs as of Postgres 13. -- Peter Geoghegan
