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According to buildfarm member sungazer, the behavior of VACUUM can be unstable in these tests even if we prevent autovacuum from running on the tables in question, apparently because even a manual vacuum can behave differently depending on whether anything else is running that holds back the global xmin. So use a temporary table instead, which as of commit a7212be8b9e0885ee769e8c55f99ef742cda487b enables vacuuming using a more aggressive cutoff. This approach can't be used for the regression test that involves a materialized view, but that test doesn't run vacuum, so it shouldn't be prone to this particular failure mode. Analysis by Tom Lane. Patch by Ashutosh Sharma and me. Discussion: http://postgr.es/m/665524.1599948007@sss.pgh.pa.us