From dff67958b1ba5c7fa9d3aed1185a7ecbc2ed4131 Mon Sep 17 00:00:00 2001
From: wangmm0220 <wangmm0220@gmail.com>
Date: Tue, 17 Aug 2021 01:02:53 +0800
Subject: [PATCH] [TD-6046]<fix> fix ts derivative error

---
 src/query/src/qExecutor.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 6fd9f70fe6..7ccaeb7ac9 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -3657,14 +3657,17 @@ void copyTsColoum(SSDataBlock* pRes, SQLFunctionCtx* pCtx, int32_t numOfOutput)
       tsNum++;
     }
   }
-  
+
   if (!needCopyTs) return;
   if (tsNum < 2) return;
   if (src == NULL) return;
 
-  for (int32_t col = 0; col < numOfOutput; ++col) {
-    SColumnInfoData* pColRes = taosArrayGet(pRes->pDataBlock, col);
-    memcpy(pColRes->pData, src, pColRes->info.bytes * pRes->info.rows);
+  for (int32_t i = 0; i < numOfOutput; i++) {
+    int32_t functionId = pCtx[i].functionId;
+    if(functionId == TSDB_FUNC_TS_DUMMY) {
+      SColumnInfoData* pColRes = taosArrayGet(pRes->pDataBlock, i);
+      memcpy(pColRes->pData, src, pColRes->info.bytes * pRes->info.rows);
+    }
   }
 }
 
-- 
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