Prevent instability in contrib/pageinspect's regression test.
authorTom Lane <tgl@sss.pgh.pa.us>
Mon, 21 Nov 2022 15:50:50 +0000 (10:50 -0500)
committerTom Lane <tgl@sss.pgh.pa.us>
Mon, 21 Nov 2022 15:50:50 +0000 (10:50 -0500)
commite2933a6e11791191050cd925d52d34e785eece77
treeed085f22f14202434f078c559a66fd43a2c81afa
parentf193883fc9cebe8fa20359b0797832837a788112
Prevent instability in contrib/pageinspect's regression test.

pageinspect has occasionally failed on slow buildfarm members,
with symptoms indicating that the expected effects of VACUUM
FREEZE didn't happen.  This is presumably because a background
transaction such as auto-analyze was holding back global xmin.

We can work around that by using a temp table in the test.
Since commit a7212be8b, that will use an up-to-date cutoff xmin
regardless of other processes.  And pageinspect itself shouldn't
really care whether the table is temp.

Back-patch to v14.  There would be no point in older branches
without back-patching a7212be8b, which seems like more trouble
than the problem is worth.

Discussion: https://postgr.es/m/2892135.1668976646@sss.pgh.pa.us
contrib/pageinspect/expected/page.out
contrib/pageinspect/sql/page.sql