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f4115528d6
The previous implementation didn't actually do a read barrier, because
the statement failed on an early prepare/validate step which happened
before read barrier was even performed.
Change it to a statement which does not fail and doesn't perform any
schema change but requires a read barrier.
This breaks one test which uses `RandomTables.verify_schema()` when only
one node is alive, but `verify_schema` performs a read barrier. Unbreak
it by skipping the read barrier in this case (it makes sense in this
particular test).
Closes #13933
(cherry picked from commit 64dc76db55)
Backport note: skipped the test_snapshot.py change, as the test doesn't
exist on this branch.