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It is possible to have a non-inherited not-null constraint on an
inherited column, but we were failing to preserve such constraints
during pg_upgrade where the source is 17 or older, because of a bug in
the pg_dump query for it. Oversight in commit 14e87ffa5c. Fix that
query. In passing, touch-up a bogus nearby comment introduced by the
same commit.
In version 17, make the regression tests leave a table in this
situation, so that this scenario is tested in the cross-version upgrade
tests of 18 and up.
Author: Dilip Kumar <dilipbalaut@gmail.com>
Reported-by: Andrew Bille <andrewbille@gmail.com>
Bug: #19074
Backpatch-through: 18
Discussion: https://postgr.es/m/19074-ae2548458cf0195c@postgresql.org