asymmetrical `(` in `message` property of result of update sql statement about lua-resty-mysql HOT 4 CLOSED

worker_processes  1;
user root root;

events {worker_connections  1024;}

http {

    access_log  logs/access.log;
    error_log  logs/error.log;

    client_body_temp_path tmp/client_body_temp;
    fastcgi_temp_path tmp/fastcgi_temp;
    proxy_temp_path tmp/proxy_temp;
    scgi_temp_path tmp/scgi_temp;
    uwsgi_temp_path tmp/uwsgi_temp;
    
    include mime.types;
    
    server {
        listen       8888;
        server_name  localhost;

        
        location / {
            content_by_lua_block {

local mysql_driver = require "resty.mysql"

local connect_table = { 
        host     = "127.0.0.1", 
        port     = 3306, 
        database = "test", 
        user     = 'root', 
        password = '', }
local connect_timeout = 1000
local idle_timeout = 10000
local pool_size = 50

local function query(statement, compact, rows)
    local db, res, ok, err, errno, sqlstate
    db, err = mysql_driver:new()
    if not db then
        return nil, err
    end
    db:set_timeout(connect_timeout) 
    res, err, errno, sqlstate = db:connect(connect_table)
    if not res then
        return nil, err, errno, sqlstate
    end
    db.compact = compact
    res, err, errno, sqlstate =  db:query(statement, rows)
    if res ~= nil then
        ok, err = db:set_keepalive(idle_timeout, pool_size)
        if not ok then
            return nil, 'fail to set_keepalive:'..err
        end
    end
    return res, err, errno, sqlstate
end

local statements = {
    'drop table if exists test_usr',
    'create table test_usr (name varchar(10))',
    'insert into test_usr values ("name1")',
    'update test_usr set name="foo"',
}

local res, err
for i, stm in ipairs(statements) do
    res, err = query(stm)
    if not res then
        return ngx.say(err)
    else

    end
end

ngx.say(res.message)

            }
        }
    
    
    }

    
}