This is an automated cherry-pick of pingcap#44486

Signed-off-by: ti-chi-bot <[email protected]>

session/session.go

@@ -469,6 +469,9 @@ func (s *session) TxnInfo() *txninfo.TxnInfo {
 	}
 
 	processInfo := s.ShowProcess()
+	if processInfo == nil {
+		return nil
+	}
 	txnInfo.ConnectionID = processInfo.ID
 	txnInfo.Username = processInfo.User
 	txnInfo.CurrentDB = processInfo.DB
@@ -2840,6 +2843,29 @@ func (s *session) ShowProcess() *util.ProcessInfo {
 	return pi
 }
 
+<<<<<<< HEAD
+=======
+// GetStartTSFromSession returns the startTS in the session `se`
+func GetStartTSFromSession(se interface{}) (startTS, processInfoID uint64) {
+	tmp, ok := se.(*session)
+	if !ok {
+		logutil.BgLogger().Error("GetStartTSFromSession failed, can't transform to session struct")
+		return 0, 0
+	}
+	txnInfo := tmp.TxnInfo()
+	if txnInfo != nil {
+		startTS = txnInfo.StartTS
+		processInfoID = txnInfo.ConnectionID
+	}
+
+	logutil.BgLogger().Debug(
+		"GetStartTSFromSession getting startTS of internal session",
+		zap.Uint64("startTS", startTS), zap.Time("start time", oracle.GetTimeFromTS(startTS)))
+
+	return startTS, processInfoID
+}
+
+>>>>>>> 3c50d5130ba (session, ddl: fix the nil point in `TxnInfo` (#44486))
 // logStmt logs some crucial SQL including: CREATE USER/GRANT PRIVILEGE/CHANGE PASSWORD/DDL etc and normal SQL
 // if variable.ProcessGeneralLog is set.
 func logStmt(execStmt *executor.ExecStmt, s *session) {