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Disable index-only scan for tests that might report variable results for "Heap Fetches" statistic due to concurrent transactions affecting whether all-visible flags can be set. Author: David Rowley Discussion: https://postgr.es/m/CAKJS1f_yjtHDJnDzx1uuR_3D7beDVAkNQfWJhRLA1gvPCzkAhg@mail.gmail.com