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If a view has some updatable and some non-updatable columns, we failed to verify updatability of any columns for which an INSERT or UPDATE on the view explicitly specifies a DEFAULT item (unless the view has a declared default for that column, which is rare anyway, and one would almost certainly not write one for a non-updatable column). This would lead to an unexpected "attribute number N not found in view targetlist" error rather than the intended error. Per bug #18546 from Alexander Lakhin. This bug is old, so back-patch to all supported branches. Discussion: https://postgr.es/m/18546-84a292e759a9361d@postgresql.org