statistics: print the process of init stats

Signed-off-by: Weizhen Wang <wangweizhen@pingcap.com>

pkg/statistics/handle/autoanalyze/refresher/worker.go

@@ -41,6 +41,7 @@ func NewWorker(statsHandle statstypes.StatsHandle, sysProcTracker sysproctrack.T
 		jobChan:        jobChan,
 		exitChan:       make(chan struct{}),
 	}
+	result.start(concurrency)
 	return result
 }