From 236f50ea0249ecb8e58f5f6f51a4001bfcbbe44f Mon Sep 17 00:00:00 2001
From: yihaoDeng <yhdeng@taosdata.com>
Date: Fri, 16 Jul 2021 18:52:08 +0800
Subject: [PATCH] [TD-5055]<fix> handle incorret result

---
 src/client/src/tscSQLParser.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 77c37239da..ecc0d5ad86 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -8262,7 +8262,9 @@ static int32_t doValidateSubquery(SSqlNode* pSqlNode, int32_t index, SSqlObj* pS
 
   // union all is not support currently
   SSqlNode* p = taosArrayGetP(subInfo->pSubquery, 0);
-
+  if (taosArrayGetSize(subInfo->pSubquery) >= 2) {
+    return invalidOperationMsg(msgBuf, "not support union in subquery");
+  }
   SQueryInfo* pSub = calloc(1, sizeof(SQueryInfo));
   tscInitQueryInfo(pSub);