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pg_class.relchecks reports the number of CHECK constraints in a table, and is stored within a smallint. It was possible to define a table that could overflow the counter when specifying more than 32k constraints (new table or adding a constraint). This would cause the table to become undroppable, as this counter should never be negative when dropping these constraints. Author: Matthias van de Meent <boekewurm+postgres@gmail.com> Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Reviewed-by: Jian He <jian.universality@gmail.com> Reviewed-by: Sivaprasad <sivaprasad.postgres@gmail.com> Discussion: https://postgr.es/m/CAEze2WjSW4qaHYnvkTtbknp85eGEirGJTLMZatotdJJKiA+_hA@mail.gmail.com Backpatch-through: 14