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This polymorphic function produces an error if the input value is detected as being the null value; otherwise it returns the input value unchanged. This function can for example become handy in SQL function bodies, to enforce that exactly one row was returned. Author: Joel Jacobson <joel@compiler.org> Reviewed-by: Vik Fearing <vik@postgresfriends.org> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/ece8c6d1-2ab1-45d5-ba12-8dec96fc8886@app.fastmail.com Discussion: https://postgr.es/m/de94808d-ed58-4536-9e28-e79b09a534c7@app.fastmail.com