Postgres中有没有定义好的函数可以让你知道是什么动作触发了触发器？

CREATE OR REPLACE FUNCTION trigger_function() RETURNS TRIGGER AS $$
BEGIN
    IF TG_OP = 'INSERT' THEN
        -- INSERT操作触发的逻辑
        RAISE NOTICE 'Trigger is fired by INSERT operation';
    ELSIF TG_OP = 'UPDATE' THEN
        -- UPDATE操作触发的逻辑
        RAISE NOTICE 'Trigger is fired by UPDATE operation';
    ELSIF TG_OP = 'DELETE' THEN
        -- DELETE操作触发的逻辑
        RAISE NOTICE 'Trigger is fired by DELETE operation';
    ELSIF TG_OP = 'TRUNCATE' THEN
        -- TRUNCATE操作触发的逻辑
        RAISE NOTICE 'Trigger is fired by TRUNCATE operation';
    END IF;
    
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER my_trigger
AFTER INSERT OR UPDATE OR DELETE OR TRUNCATE ON my_table
FOR EACH ROW
EXECUTE FUNCTION trigger_function();