From 4b9c461c542e6e0e71beaf9d4b677e46ef89a822 Mon Sep 17 00:00:00 2001
From: wangmm0220 <wangmm0220@gmail.com>
Date: Mon, 16 Aug 2021 15:16:44 +0800
Subject: [PATCH] [6046]<fix> fix ts is null

---
 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 781b1be76f..bb2b8f3c52 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -7052,6 +7052,10 @@ static int32_t checkUpdateTagPrjFunctions(SQueryInfo* pQueryInfo, char* msg) {
       continue;
     }
 
+    if(functionId == TSDB_FUNC_DERIVATIVE){     // to avoid ts function id was modufied below
+      tagTsColExists = false;
+    }
+
     if (functionId < 0) {
       SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
       if (pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE) {
-- 
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