环境/版本：docker oceanbase/oceanbase-ce:4.3.5-lts 镜像
当执行以下sql语句后断开连接，observer疑似无响应，无法再次连接
CREATE TABLE IF NOT EXISTS t0 (c1 MEDIUMINT);
INSERT IGNORE INTO t0 (c1) VALUES (1715290);
SELECT t0.c1 AS ca1 FROM t0 WHERE (ADDDATE('2002-10-02 20:40:36', INTERVAL TO_SECONDS('2002-10-02 20:40:36') YEAR_MONTH)) IS NULL;