From 9337caa62aa43f67eadfde801c93dfcfecbf8667 Mon Sep 17 00:00:00 2001
From: Cary Xu <klxu@taosdata.com>
Date: Wed, 3 Nov 2021 12:38:44 +0800
Subject: [PATCH] <TS-569><fix>:fill 1 extra NULL for update 2

---
 src/common/src/tdataformat.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/common/src/tdataformat.c b/src/common/src/tdataformat.c
index c34a049a41..29f9bc8854 100644
--- a/src/common/src/tdataformat.c
+++ b/src/common/src/tdataformat.c
@@ -253,9 +253,10 @@ int dataColAppendVal(SDataCol *pCol, const void *value, int numOfRows, int maxPo
     }
 
     if(tdAllocMemForCol(pCol, maxPoints) < 0) return -1;
-    if (numOfRows > 0) {
+
+    if (((rowOffset == 0) && (numOfRows > 0)) || ((rowOffset == -1) && (numOfRows >= 0))) {
       // Find the first not null value, fill all previouse values as NULL
-      dataColSetNEleNull(pCol, numOfRows);
+      dataColSetNEleNull(pCol, numOfRows - rowOffset);
     }
   }
 
-- 
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