From 99c92420dfde2d7c41a06e115b3f991aebed6e9b Mon Sep 17 00:00:00 2001
From: Alex Duan <417921451@qq.com>
Date: Tue, 25 Oct 2022 14:21:31 +0800
Subject: [PATCH] fix(query): check empty string

---
 src/client/src/tscAsync.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/client/src/tscAsync.c b/src/client/src/tscAsync.c
index 673c5f4534..77b768ebce 100644
--- a/src/client/src/tscAsync.c
+++ b/src/client/src/tscAsync.c
@@ -334,8 +334,12 @@ bool appendTagsFilter(SSqlObj* pSql) {
     return false;
   }
 
-  // check tags is blank
+  // check tags is blank or ''
   char* p1 = pTscObj->tags;
+  if (strcmp(p1, "\'\'") == 0) {
+    tscDebug("TAGS 0x%" PRIx64 " tags is empty. user=%s", pSql->self, pTscObj->user);
+    return false;
+  }
   bool blank = true;
   while(*p1 != 0) {
     if(*p1 != ' ') {
-- 
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