From 40a78bde5038a385bcf32839106202ae6f00d830 Mon Sep 17 00:00:00 2001
From: slzhou <shenglian_zhou@163.com>
Date: Thu, 23 Mar 2023 13:49:08 +0800
Subject: [PATCH] fix: unknow db error when query ins_tables with table_name=""

---
 source/libs/parser/src/parUtil.c       | 2 +-
 tests/script/tsim/query/sys_tbname.sim | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/source/libs/parser/src/parUtil.c b/source/libs/parser/src/parUtil.c
index 793d05721e..563bc5e780 100644
--- a/source/libs/parser/src/parUtil.c
+++ b/source/libs/parser/src/parUtil.c
@@ -444,7 +444,7 @@ static int32_t getInsTagsTableTargetNameFromOp(int32_t acctId, SOperatorNode* pO
   } else if (QUERY_NODE_VALUE == nodeType(pOper->pRight)) {
     pVal = (SValueNode*)pOper->pRight;
   }
-  if (NULL == pCol || NULL == pVal) {
+  if (NULL == pCol || NULL == pVal || NULL == pVal->literal || 0 == strcmp(pVal->literal, "")) {
     return TSDB_CODE_SUCCESS;
   }
 
diff --git a/tests/script/tsim/query/sys_tbname.sim b/tests/script/tsim/query/sys_tbname.sim
index 7b3953129a..c676f2b1e0 100644
--- a/tests/script/tsim/query/sys_tbname.sim
+++ b/tests/script/tsim/query/sys_tbname.sim
@@ -51,6 +51,11 @@ if $data00 != @ins_stables@ then
 	return -1
 endi
 
+sql select * from information_schema.ins_tables where table_name='';
+if $rows != 0 then 
+        return -1
+endi
+
 sql select tbname from information_schema.ins_tables;
 print $rows $data00
 if $rows != 33 then
-- 
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