CREATE OR REPLACE FUNCTION item_comments(_item_id int, _level int, _where text, _order_by text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ DECLARE result jsonb; BEGIN IF _level < 1 THEN RETURN '[]'::jsonb; END IF; EXECUTE '' || 'SELECT COALESCE(jsonb_agg(sub), ''[]''::jsonb) AS comments ' || 'FROM ( ' || ' SELECT "Item".*, "Item".created_at AS "createdAt", "Item".updated_at AS "updatedAt", ' || ' item_comments("Item".id, $2 - 1, $3, $4) AS comments, to_jsonb(users.*) as user ' || ' FROM "Item" p ' || ' JOIN "Item" ON "Item"."parentId" = p.id ' || ' JOIN users ON users.id = "Item"."userId" ' || ' WHERE p.id = $1 ' || _where || ' ' || _order_by || ' ) sub' INTO result USING _item_id, _level, _where, _order_by; RETURN result; END $$;