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GENERATED ALWAYS AS IDENTITY implies NOT NULL, but the code failed to complain if you overrode that with "GENERATED ALWAYS AS IDENTITY NULL". One might think the old behavior was a feature, but it was inconsistent because the outcome varied depending on the order of the clauses, so it seems to have been just an oversight. Per bug #16913 from Pavel Boev. Back-patch to v10 where identity columns were introduced. Vik Fearing (minor tweaks by me) Discussion: https://postgr.es/m/16913-3b5198410f67d8c6@postgresql.org |
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