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CREATE FUNCTION can_be_cast(i text, t regtype) RETURNS bool AS $$ BEGIN EXECUTE 'SELECT $1::' || t USING i; RETURN true; EXCEPTION WHEN OTHERS THEN RETURN false; END; $$ LANGUAGE plpgsql; SELECT can_be_cast('4', 'int'); SELECT can_be_cast('4foo', 'int'); -- false SELECT can_be_cast('2023-09-06', 'date'); SELECT can_be_cast('{"x": 5}', 'jsonb');

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