This reverts commit
5cda142bb9d2bd7e7ed1c22ae89afe58abfa8d7b
(in v14 only).
It turns out that that fails under force_parallel_mode = regress,
because pageinspect's disk-access functions are marked parallel
safe, which they are not if you try to use them on a temp table.
The cost of fixing that pre-v15 seems to exceed the value of
making this test case fully stable, so we will just leave things
as-is in v14.
CREATE EXTENSION pageinspect;
--- Use a temp table so that effects of VACUUM are predictable
-CREATE TEMP TABLE test1 (a int, b int);
+CREATE TABLE test1 (a int, b int);
INSERT INTO test1 VALUES (16777217, 131584);
VACUUM (DISABLE_PAGE_SKIPPING) test1; -- set up FSM
-- The page contents can vary, so just test that it can be read
CREATE EXTENSION pageinspect;
--- Use a temp table so that effects of VACUUM are predictable
-CREATE TEMP TABLE test1 (a int, b int);
+CREATE TABLE test1 (a int, b int);
INSERT INTO test1 VALUES (16777217, 131584);
VACUUM (DISABLE_PAGE_SKIPPING) test1; -- set up FSM