在本地测试update的功能是正常的，提测的时候返回这样的结果
UPDATE update_table_1 SET t_name='CUJTQ0QSZDX' WHERE id=69;
+ failed to receive response from observer. reason=Failed to receive from server. poll return POLLHUP=16 or POLLERR=str(event & select.POLLERR)
failed to receive response from observer. reason=Failed to receive from server. poll return POLLHUP=16 or POLLERR=str(event & select.POLLERR)
-- below are some requests executed before(partial) --
-- init data
CREATE TABLE update_table_1(id int, t_name char(20), col1 int, col2 int);
CREATE INDEX index_id on update_table_1(id);
INSERT INTO update_table_1 VALUES (69, 'KR90BN755XI4I', 3, 64);
INSERT INTO update_table_1 VALUES (72, 'NBT8SDIRL9', 68, 59);
INSERT INTO update_table_1 VALUES (5, 'I8J3C7', 27, 9);