avoid using ExecuteAggregationQueryV2
diff --git a/client/session.go b/client/session.go
index fcb99e3..e8ca728 100644
--- a/client/session.go
+++ b/client/session.go
@@ -514,7 +514,7 @@
 	request := rpc.TSAggregationQueryReq{SessionId: s.sessionId, StatementId: s.requestStatementId, Paths: paths,
 		Aggregations: aggregations, StartTime: startTime, EndTime: endTime, Interval: interval, FetchSize: &s.config.FetchSize,
 		Timeout: timeoutMs, LegalPathNodes: legalNodes}
-	if resp, err := s.client.ExecuteAggregationQueryV2(context.Background(), &request); err == nil {
+	if resp, err := s.client.ExecuteAggregationQuery(context.Background(), &request); err == nil {
 		if statusErr := VerifySuccess(resp.Status); statusErr == nil {
 			return NewSessionDataSet("", resp.Columns, resp.DataTypeList, resp.ColumnNameIndexMap, *resp.QueryId, s.client, s.sessionId, resp.QueryDataSet, resp.IgnoreTimeStamp != nil && *resp.IgnoreTimeStamp, s.config.FetchSize, timeoutMs), err
 		} else {
diff --git a/example/session_example.go b/example/session_example.go
index 5950a0b..e56373a 100644
--- a/example/session_example.go
+++ b/example/session_example.go
@@ -57,7 +57,7 @@
 	}
 	defer session.Close()
 
-	// fastInsertRecords()
+	fastInsertRecords()
 
 	setStorageGroup("root.ln1")
 	deleteStorageGroup("root.ln1")