From c6c3d96cb50924e4c4cff0157079fbe5639c7781 Mon Sep 17 00:00:00 2001
From: Hui Li <huili@taosdata.com>
Date: Mon, 24 Aug 2020 18:18:48 +0800
Subject: [PATCH] [TD-880]

---
 src/os/src/detail/osDir.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/os/src/detail/osDir.c b/src/os/src/detail/osDir.c
index 2f82d8866c..7a537cdfea 100644
--- a/src/os/src/detail/osDir.c
+++ b/src/os/src/detail/osDir.c
@@ -56,6 +56,8 @@ void taosRename(char* oldName, char *newName) {
     return;
   }
 
+  // if newName in not empty, rename return fail. 
+  // the newName must be empty or does not exist
   if (rename(oldName, newName)) {
     uError("%s is modify to %s fail, reason:%s", oldName, newName, strerror(errno));
   } else {
-- 
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