From 2b1dc53ae1af311ef5763848c3d877785bc30451 Mon Sep 17 00:00:00 2001
From: Hongze Cheng <hzcheng@taosdata.com>
Date: Thu, 17 Sep 2020 12:13:19 +0800
Subject: [PATCH] fix update bug

---
 src/tsdb/src/tsdbRead.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 806f0ea828..4f902b624b 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -1321,7 +1321,11 @@ static void doMergeTwoLevelData(STsdbQueryHandle* pQueryHandle, STableCheckInfo*
         assert(end != -1);
 
         if (tsArray[end] == key) { // the value of key in cache equals to the end timestamp value, ignore it
-          moveToNextRowInMem(pCheckInfo);
+          if (!pCfg->update) {
+            moveToNextRowInMem(pCheckInfo);
+          } else {
+            end -= step;
+          }
         }
 
         int32_t qstart = 0, qend = 0;
-- 
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