br: fix br raw backup

Issue Number: close #32607

Signed-off-by: pingyu <yuping@pingcap.com>

br/pkg/restore/split.go

@@ -77,6 +77,7 @@ func (rs *RegionSplitter) Split(
 	ctx context.Context,
 	ranges []rtree.Range,
 	rewriteRules *RewriteRules,
+	isRawKv bool,
 	onSplit OnSplitFunc,
 ) error {
 	if len(ranges) == 0 {
@@ -111,7 +112,7 @@ SplitRegions:
 			}
 			return errors.Trace(errScan)
 		}
-		splitKeyMap := getSplitKeys(rewriteRules, sortedRanges, regions, true)
+		splitKeyMap := getSplitKeys(rewriteRules, sortedRanges, regions, isRawKv)
 		regionMap := make(map[uint64]*RegionInfo)
 		for _, region := range regions {
 			regionMap[region.Region.GetId()] = region

br/pkg/restore/split_test.go

@@ -273,7 +273,7 @@ func TestScatterFinishInTime(t *testing.T) {
 	regionSplitter := restore.NewRegionSplitter(client)
 
 	ctx := context.Background()
-	err := regionSplitter.Split(ctx, ranges, rewriteRules, func(key [][]byte) {})
+	err := regionSplitter.Split(ctx, ranges, rewriteRules, false, func(key [][]byte) {})
 	require.NoError(t, err)
 	regions := client.GetAllRegions()
 	if !validateRegions(regions) {
@@ -329,7 +329,7 @@ func runTestSplitAndScatterWith(t *testing.T, client *TestClient) {
 	regionSplitter := restore.NewRegionSplitter(client)
 
 	ctx := context.Background()
-	err := regionSplitter.Split(ctx, ranges, rewriteRules, func(key [][]byte) {})
+	err := regionSplitter.Split(ctx, ranges, rewriteRules, false, func(key [][]byte) {})
 	require.NoError(t, err)
 	regions := client.GetAllRegions()
 	if !validateRegions(regions) {

br/pkg/restore/util.go

@@ -349,7 +349,7 @@ func SplitRanges(
 ) error {
 	splitter := NewRegionSplitter(NewSplitClient(client.GetPDClient(), client.GetTLSConfig(), isRawKv))
 
-	return splitter.Split(ctx, ranges, rewriteRules, func(keys [][]byte) {
+	return splitter.Split(ctx, ranges, rewriteRules, isRawKv, func(keys [][]byte) {
 		for range keys {
 			updateCh.Inc()
 		}