From c304e46aabeca857914209bb4b4201008ad587e7 Mon Sep 17 00:00:00 2001
From: wpan <wpan@taosdata.com>
Date: Wed, 25 Aug 2021 10:55:13 +0800
Subject: [PATCH] fix invalid func in nested query

---
 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 7a24df8b40..56ef9dbcc8 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -8092,6 +8092,10 @@ static int32_t getTableNameFromSubquery(SSqlNode* pSqlNode, SArray* tableNameLis
     int32_t num = (int32_t)taosArrayGetSize(sub->pSubquery);
     for (int32_t i = 0; i < num; ++i) {
       SSqlNode* p = taosArrayGetP(sub->pSubquery, i);
+      if (p->from == NULL) {
+        return TSDB_CODE_TSC_INVALID_OPERATION;
+      }
+      
       if (p->from->type == SQL_NODE_FROM_TABLELIST) {
         int32_t code = getTableNameFromSqlNode(p, tableNameList, msgBuf, pSql);
         if (code != TSDB_CODE_SUCCESS) {
-- 
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