From 699000cc37a569be5feee4c64873e11a620c007a Mon Sep 17 00:00:00 2001
From: Minglei Jin <mljin@taosdata.com>
Date: Mon, 7 Mar 2022 17:51:49 +0800
Subject: [PATCH] [TS-1286]<fix>: validate empry ep in show vnodes command

---
 src/client/src/tscSQLParser.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 071b034fa2..4fd814ee72 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -3947,6 +3947,10 @@ int32_t setShowInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     if (pShowInfo->prefix.type == TK_STRING) {
       pShowInfo->prefix.n = stringProcess(pShowInfo->prefix.z, pShowInfo->prefix.n);
     }
+
+    if (pShowInfo->prefix.n <= 0) {
+      return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg6);
+    }
   } 
   return TSDB_CODE_SUCCESS;
 }
-- 
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