code: func (eg *EngineGroup) ShowExecTime(show ...bool) {
  	eg.Engine.ShowExecTime(show...)
  	for i := 0; i < len(eg.slaves); i++ {
  		eg.slaves[i].ShowExecTime(show...)
  	}
  }
docs: // ShowExecTime show SQL statement and execute time or not on logger if log level is great than INFO