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When using the CREATE TABLE .. PARTITION OF syntax, it's possible to cause a partition to get two primary keys if the parent already has one. Tighten the check to disallow that. Reported-by: Rajkumar Raghuwanshi Author: Amul Sul Discussion: https://postgr.es/m/CAKcux6=OnSV3-qd8Gb6W=KPPwcCz6Fe_O_MQYjTa24__Xn8XxA@mail.gmail.com