statistics: fix the sync load sql did'nt running internally (#40087)

close #39511

session/session.go

@@ -2091,7 +2091,7 @@ func (s *session) ExecRestrictedSQL(ctx context.Context, opts []sqlexec.OptionFu
 		metrics.SessionRestrictedSQLCounter.Inc()
 		ctx = context.WithValue(ctx, execdetails.StmtExecDetailKey, &execdetails.StmtExecDetails{})
 		ctx = context.WithValue(ctx, tikvutil.ExecDetailsKey, &tikvutil.ExecDetails{})
-		rs, err := se.ExecuteStmt(ctx, stmt)
+		rs, err := se.ExecuteInternalStmt(ctx, stmt)
 		if err != nil {
 			se.sessionVars.StmtCtx.AppendError(err)
 		}
@@ -2113,6 +2113,18 @@ func (s *session) ExecRestrictedSQL(ctx context.Context, opts []sqlexec.OptionFu
 	})
 }
 
+// ExecuteInternalStmt execute internal stmt
+func (s *session) ExecuteInternalStmt(ctx context.Context, stmtNode ast.StmtNode) (sqlexec.RecordSet, error) {
+	origin := s.sessionVars.InRestrictedSQL
+	s.sessionVars.InRestrictedSQL = true
+	defer func() {
+		s.sessionVars.InRestrictedSQL = origin
+		// Restore the goroutine label by using the original ctx after execution is finished.
+		pprof.SetGoroutineLabels(ctx)
+	}()
+	return s.ExecuteStmt(ctx, stmtNode)
+}
+
 func (s *session) ExecuteStmt(ctx context.Context, stmtNode ast.StmtNode) (sqlexec.RecordSet, error) {
 	if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
 		span1 := span.Tracer().StartSpan("session.ExecuteStmt", opentracing.ChildOf(span.Context()))