hot_region: assign historyLoads to LoadPred.Current (#9271)

close #9270

Signed-off-by: okJiang <[email protected]>

Author: okJiang

pkg/statistics/store_collection_test.go

@@ -140,6 +140,7 @@ func TestSummaryStoreInfos(t *testing.T) {
 		expect := []float64{2, 4, 10}
 		for _, detail := range details {
 			loads := detail.LoadPred.Current.HistoryLoads
+			re.Len(loads, len(expectHistoryLoads))
 			storeID := detail.GetID()
 			for i := range loads {
 				for j := range loads[0] {
@@ -149,6 +150,7 @@ func TestSummaryStoreInfos(t *testing.T) {
 				}
 			}
 
+			re.Len(detail.LoadPred.Expect.HistoryLoads, len(expectHistoryLoads))
 			for i, loads := range detail.LoadPred.Expect.HistoryLoads {
 				for _, load := range loads {
 					if load != 0 {

pkg/statistics/store_hot_peers_infos.go

@@ -176,11 +176,13 @@ func summaryStoresLoadByEngine(
 
 		var historyLoads [][]float64
 		if storesHistoryLoads != nil {
-			for i, historyLoads := range storesHistoryLoads.Get(id, rwTy, kind) {
-				if allStoreHistoryLoadSum[i] == nil || len(allStoreHistoryLoadSum[i]) < len(historyLoads) {
-					allStoreHistoryLoadSum[i] = make([]float64, len(historyLoads))
+			historyLoads = storesHistoryLoads.Get(id, rwTy, kind)
+
+			for i, loads := range historyLoads {
+				if allStoreHistoryLoadSum[i] == nil || len(allStoreHistoryLoadSum[i]) < len(loads) {
+					allStoreHistoryLoadSum[i] = make([]float64, len(loads))
 				}
-				for j, historyLoad := range historyLoads {
+				for j, historyLoad := range loads {
 					allStoreHistoryLoadSum[i][j] += historyLoad
 				}
 			}