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To avoid a race condition where the relation being COPY'd could be changed into a view or otherwise modified, keep the original lock on the relation. Further, fully qualify the relation when building the query up. Also remove the poorly thought-out Assert() and check the entire relationOids list as, post-RLS, there can certainly be multiple relations involved and the planner does not guarantee their ordering. Per discussion with Noah and Andres. Back-patch to 9.5 where RLS was introduced.