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49082c2cc3
This patch is extracted from a larger patch that allowed setting the default returned value from these functions to json or jsonb. That had problems, but this piece of it is fine. For these functions only json or jsonb can be specified in the RETURNING clause. Extracted from an original patch from Nikita Glukhov Reviewers have included (in no particular order) Andres Freund, Alexander Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zihong Yu, Himanshu Upadhyaya, Daniel Gustafsson, Justin Pryzby. Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru