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TOAST tables have a visibility map and a free space map, so they can be supported by pgstattuple_approx just fine. Add test cases to show how various pgstattuple functions accept TOAST tables. Also add similar tests to pg_visibility, which already accepted TOAST tables correctly but had no test coverage for them. Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at> Discussion: https://www.postgresql.org/message-id/flat/27c4496a-02b9-dc87-8f6f-bddbef54e0fe@2ndquadrant.com