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Buildfarm member avocet has shown a plan change by switching the finalize aggregate stage to use a GroupAggregate rather than a HashAggregate. This is consistent with autovacuum having triggered on the table, per analysis by Alexander Lakhin. Fix this by disabling autovacuum on the table. Reported-by: Alexander Lakhin Discussion: https://postgr.es/m/d4493a28-589a-5328-fed5-250f2d7d3e2a@gmail.com Backpatch-through: 16, where this test was added.