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We were using SnapshotAny to do some index checks, but that's wrong and causes spurious errors when used on indexes created by CREATE INDEX CONCURRENTLY. Fix it to use an MVCC snapshot, and add a test for it. Backpatch of6bd469d26ato branches 14-16. I previously misidentified the bug's origin: it came in with commit7f563c09f8(pg11-era, not5ae2087202as claimed previously), so all live branches are affected. Also take the opportunity to fix some comments that we failed to update in the original commits and apply pgperltidy. In branch 14, remove the unnecessary test plan specification (which would have need to have been changed anyway; c.f. commit 549ec201d613.) Diagnosed-by: Donghang Lin <donghanglin@gmail.com> Author: Mihail Nikalayeu <mihailnikalayeu@gmail.com> Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru> Backpatch-through: 17 Discussion: https://postgr.es/m/CANtu0ojmVd27fEhfpST7RG2KZvwkX=dMyKUqg0KM87FkOSdz8Q@mail.gmail.com