code: func newClientConn(s *Server) *clientConn {
  	return &clientConn{
  		server:       s,
  		connectionID: atomic.AddUint32(&baseConnID, 1),
  		collation:    mysql.DefaultCollationID,
  		alloc:        arena.NewAllocator(32 * 1024),
  		status:       connStatusDispatching,
  	}
  }
docs: // newClientConn creates a *clientConn object.